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16 July 2020, Volume 39 Issue 07 Previous Issue    Next Issue
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Transport+Big Data and Artificial Intelligence
Traffic & Transportation Engineering
Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment
Vehicle &Electromechanical Engineering


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Transport+Big Data and Artificial Intelligence

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Scheduling Model and Algorithm for Shared Bicycle YU Dexin1,2,3, ZHANG Hang1,WANG Wei1,2,3, XING Xue1, LIU Heng1 2020, 39(07): 1-7.  DOI: 10.3969/j.issn.1674-0696.2020.07.01 Abstract ( )   PDF (4401KB) ( )   The development of urban slow traffic has been restricted by the problems such as the low turnover rate and the high scheduling cost in the process of shared bicycle operation. Aiming at the limitation of the assumptions of the current bicycle scheduling model, a transfer maximization strategy in the mode of shared economy was proposed. Based on the detailed analysis of the shared bicycle scheduling cost and related parameters, a shared bicycle scheduling model was established with the goal of minimizing the cost and maximizing the launch rate. The elite strategy and evolution operator were introduced to improve the genetic algorithm. The TOPSIS method was used to select the optimal route from the effective routes solved by the improved algorithm.A certain area in Beijing was selected for simulation analysis. The results show that the improved algorithm has good ability of searching for optimal solutions. Compared with the conventional scheduling model, the alternative scheduling routes are increased by 74.3%, and the average scheduling cost is further reduced by 18.3%. References | Related Articles | Metrics

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Differences in Environmental Demand Characteristics between Residential and Office Walkway ZHU Shunying, AN Jingyi, WANG Hong, ZOU He, XIAO Wenbin 2020, 39(07): 8-14.  DOI: 10.3969/j.issn.1674-0696.2020.07.02 Abstract ( )   PDF (1117KB) ( )   In order to create a more attractive pedestrian environment, the three-factor theory and topological set theory were used to analyze the difference of pedestrian demand for the environment of residential and office walkway. Firstly, a walkway satisfaction index system was constructed and the pedestrian satisfaction survey was carried out. Secondly, according to the overall satisfaction, the pedestrians were divided into two groups, including satisfaction ones and dissatisfaction ones. And the artificial neural network was used to determine the effect coefficient W of influencing factors of satisfaction of the two groups. Finally, based on the three-factor theory, the elastic coefficient a of influencing factors was proposed and analyzed. According to a, the demand for walkway can be divided into three categories: basic demand, development demand and incentive demand. According to the trend of the elastic coefficient curve of the influencing factors, the demand characteristics of pedestrian for residential and office walkway were analyzed by using the topological set theory. The results show that: in terms of basic demand, pedestrians have accessibility requirements for both residential and office walkway; in terms of development demand, pedestrians pay more attention to the beauty, comfort and safety of residential walkway, while the convenience of office walkway is required; the performance of residential and office walkway in incentive demand is opposite to that in development demand. References | Related Articles | Metrics

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Data Acquisition and Analysis System Design Based on Wheel Six-Component SUN Renyun, ZHANG Yang, WU Aiman, XI Lin, LI-HE Yuqiu, LIU Changwei 2020, 39(07): 15-21.  DOI: 10.3969/j.issn.1674-0696.2020.07.03 Abstract ( )   PDF (3995KB) ( )   The wheel six-component data acquisition and analysis system was based on the wheel force transducer(WFT) as the hardware foundation and programmed by LabVIEW software, which was used for the vehicle wheel force data dynamic acquisition and processing analysis test as well as the completion of the automobile brake performance research.The proposed system made a relatively deep development of WFT and designed three functional modules:wheel force acquisition, data dynamic processing and analysis, and historical data analysis. The real vehicle test was completed on the dry and good asphalt road, which verified the dynamic performance of the proposed system, completed the tests including vehicle speed, braking force and torque, adhesion coefficient and slip rate, and achieved the expected results of the experiment.The research results show that the proposed system has good test performance,which can be used in the test of automobile braking performance, and can provide reference for the research of tire characteristics, road identification and vehicle dynamics characteristics. References | Related Articles | Metrics

Traffic & Transportation Engineering

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Sensitivity Analysis of Parameters of Highway Rear-End Accident Based on PC-Crash HUANG Xizi1, 2, HUANG Shuping1, 2 2020, 39(07): 22-26.  DOI: 10.3969/j.issn.1674-0696.2020.07.04 Abstract ( )   PDF (363KB) ( )   Rear-end accident is one of the main forms of highway accidents. Firstly, PC-Crash software was used to build basic collision models between small cars. Secondly, taking displacement and deformation as evaluation indexes, with the one-way ANOVA parameter sensitivity analysis, the influence degree of twenty-one relatively important parameters of the first type built in the software on rear-end accident were compared and evaluated. And ten parameters with high sensitivity coefficient were selected. Finally, taking the impact velocity V as the evaluation index, the sensitivity analysis of ten parameters was carried out by orthogonal test method. And the sensitivity (i.e. the impact degree of rear-end accident) ranking was obtained as follows: reaction time t>initial velocity v0>deceleration a > collision surface angle θ >collision point position p>centroid coordinate y>distance from centroid to front axis sv>vehicle weight w>centroid coordinate x>adhesion coefficient μ. The results show that the top three most sensitive parameters obtained by PC-Crash simulation are t, v0 and a, which are consistent with the results obtained by the following theory of traffic flow. The research conclusion can provide reference for rear-end warning algorithm and model parameter selection. References | Related Articles | Metrics

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Evaluation of the Development Efficiency of Shenzhen Ecological Transportation Based on DEMATEL-BCC Model CHEN Yanyi, CAO Ying, ZHANG Jianan, FENG Rui 2020, 39(07): 27-32.  DOI: 10.3969/j.issn.1674-0696.2020.07.05 Abstract ( )   PDF (479KB) ( )   With the introduction of a series of strategies such as transportation power and ecological priority, the development of ecological transportation has become an inevitable choice for the development of urban transportation systems. Based on the connotation of ecological transportation, combined with the characteristics of Shenzhens developed economy, a large population with relatively little land, long commuting distance and large traffic load, the DEMATEL-BCC model was established to evaluate the development efficiency of ecological transportation in Shenzhen from 2008 to 2017. The results show that the development of ecological transportation in Shenzhen is relatively stable in 2008—2017. Although the scale efficiency has fine microwaves, the pure technical efficiency develops better. In the future, the development of transportation in Shenzhen should not only focus on the development of scale, but also pay attention to the quality of ecological transportation development and focus on the happiness of travel. References | Related Articles | Metrics

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Comparison of Multiple Forecast Models of Urban Traffic Carbon Emissions GAO Jinhe1, HUANG Weiling2, JIANG Haopeng3 2020, 39(07): 33-39.  DOI: 10.3969/j.issn.1674-0696.2020.07.06 Abstract ( )   PDF (828KB) ( )   In order to find a suitable prediction method for carbon emission of urban traffic, 7 indexes were selected as the influencing factors of carbon emission of urban traffic based on the STIRPAT model. The 7 indexes included total population, per capita GDP, vehicle ownership, carbon emission intensity, urbanization rate, passenger turnover, cargo turnover and etc.. The prediction models of GA-SVM, PSO-SVM and GS-SVM were established respectively.And the relevant indicators of traffic carbon emissions from 1995 to 2016 were taken as the basic data for case study. The results show that: compared with PSO-SVM and GS-SVM, the correlation coefficients of training set of GA-SVM increase by 2.74% and 1.07% respectively, and the correlation coefficients of test set of GA-SVM increase by 1.04% and 0.29% respectively. Compared with the other two prediction models, GA-SVM model has good learning and generalization ability, which indicates that GA-SVM model is more suitable for the prediction and analysis of urban traffic carbon emissions. References | Related Articles | Metrics

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Limit of Ships Large-Scale YANG Qiuping1, NING Tao1, DU Lida2, SU Bohan3 2020, 39(07): 40-46.  DOI: 10.3969/j.issn.1674-0696.2020.07.07 Abstract ( )   PDF (1540KB) ( )   In order to explore the reasonable limit scale of ships large-scale, the development process of large-scale of oil tanker, bulk carrier and container ship was reviewed. Using the method of system analysis, the influencing factors of ships large-scale were summed up, and the logical relationship diagram among the main influencing factors was constructed. The influence of ships large-scale on port and shipping market was analyzed; and the future development trend of the key factors, such as maritime demand, transportation distance and transportation organization mode was judged in advance. The conclusion shows that: after several adjustments, the oil tankers and bulk carriers have found a limit value which is suitable for the current development environment. Under the current technology and operation environment, the future container ships large-scale has got close to the stage upper limit. References | Related Articles | Metrics

Bridge & Tunnel Engineering

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Design and Mechanical Properties Analysis of Cable-Hingeless Arch Composite Structure YAN Renzhang1,2, ZHU Meihao1,2, WANG Shuai3, QIU Junli1,2, ZHOU Jianting1,2 2020, 39(07): 47-59.  DOI: 10.3969/j.issn.1674-0696.2020.07.08 Abstract ( )   PDF (4845KB) ( )   The hingeless arch is widely used due to its simple structure and good stability, the cable-arch structure formed by introducing prestress on the bare arch can further optimize the structural efficiency. However, most of the existing researches are focused on the hinged arch, which limits the popularization and application of the cable-hingeless arch structure. Based on the distribution law of the bending moment of the hingeless arch under the uniform load, the prestress design method of the cable-hingeless arch structure was studied by the equivalent load method; the mechanic properties of cable-hingeless arch structure and the hingeless arch were compared and analyzed. Aiming at the phenomenon that the bending moment of the skewback of cable-arch structure increased greatly, the construction method of change from hinge support to fixed support and reverse correction of manufacturing alignment was proposed. By comparing and analyzing the static performance of the cable-hingeless arch structure with change from hinge support to fixed support and the corresponding bare arch structure, the internal force optimization law of the prestress on the hingeless arch was clarified. It is found that the prestress of the cable-hingeless arch structure mainly optimizes the bending moment of the structure under the action of dead load, and the stability of the structure under the half-span load is much lower than that under the full-span load. References | Related Articles | Metrics

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A New Method for Alignment Control of Datum Strand of Self-anchored Suspension Bridge WANG Haicheng1，XIAO Jun2，GUO Xiang3，WANG Feng1，CHEN-JIANG Haonan4 2020, 39(07): 60-65.  DOI: 10.3969/j.issn.1674-0696.2020.07.09 Abstract ( )   PDF (712KB) ( )   Different from earth-anchored suspension bridge, during the erection of the datum strand, the datum strand alignment of self-anchored suspension bridge was not only changed by the expansion of the main cable due to the environmental temperature, but also changed by the expansion of the main beam due to the anchoring of the main cable at the beam end, which made the datum strand alignment difficult to be controlled. The datum strand was easy to be consistent with the ambient temperature at night, and the main beam was difficult to be consistent with the ambient temperature due to its large size and slow heat dissipation. Based on this, a new method for alignment adjustment of the datum strand of the self-anchored suspension bridge was proposed. The research results indicate that the proposed method has the following characteristics: during the night when the temperature is stable, the variation of the datum strand alignment caused by the temperature difference of the datum strand itself and the main beam can be effectively separated; during the night when the temperature is stable, for a constrained span of main beam, the datum strand alignment tends to be stable easily. References | Related Articles | Metrics

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Mechanical Analysis of Viscoelastic Pavement under the Condition of Interlayer Contact WANG Hu,CHEN Xiang, WANG Ya 2020, 39(07): 66-72.  DOI: 10.3969/j.issn.1674-0696.2020.07.10 Abstract ( )   PDF (1268KB) ( )   In order to analyze the stress of viscoelastic pavement under the condition of interlayer contact, the finite element analysis model was established by taking the simply supported box girder bridge as an example. And the mechanical response of pavement under different asphalt layer thickness, different bond layer thickness and different contact cohesive force was analyzed under horizontal impact load. The results show that under the condition of interlayer contact, the maximum value of lateral stress of pavement layer appears at the edge of load area, and the minimum value appears at the center of load area. Increasing the thickness of asphalt layer will increase the longitudinal tensile stress of asphalt layer, but it can improve the appearance of unstable ruts. Increasing the thickness of the bond layer will reduce the longitudinal and transverse tensile stress of the pavement layer, but it has little effect on other stresses and deformation of the pavement layer. The change of contact cohesion between asphalt layer and bonder layer has little influence on the stress. When the cohesion is greater than 0.01MPa, the stress of each layer remains unchanged. References | Related Articles | Metrics

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Analysis and Simulation of Mechanical Performance of Precast Segmental Assembly Piers DU Qing, ZHANG Senbo, QING Longbang 2020, 39(07): 73-80.  DOI: 10.3969/j.issn.1674-0696.2020.07.11 Abstract ( )   PDF (1835KB) ( )   The precast segmental piers obtained the re-centering ability through the post tensioned prestress applied by the prestressed reinforcement,and increased the energy consumption capacity of the pier through the energy dissipation steel bars.Under the action of horizontal load, each section of pier would open and close at the joints, which had the characteristics of swing and re-centering structure.According to the existing research results,the seismic action of the structure could be effectively reduced during the swing process, and the ductility requirement of the structure in design could be reduced. The final performance was to reduce the seismic damage of the structure and save the cost.Referring to the relevant domestic and foreign codes and the existing research results,the performance state of precast segmental piers was divided, and the design method of precast segmental pier section was proposed. Then, an example bridge pier was given to illustrate the specific design steps. Finally, the solid model was established by using the finite element analysis software ADINA to verify.The research shows that the proposed design method is simple and reasonable, and the verification results are similar to the expected ones, which can provide reference for the design of such piers in the future. References | Related Articles | Metrics

Highway & Railway Engineering

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Risk Assessment of Highway Construction Based on Relative Difference Function QIAO Jiangang, WANG Wei, LI Shixuan 2020, 39(07): 81-85.  DOI: 10.3969/j.issn.1674-0696.2020.07.12 Abstract ( )   PDF (517KB) ( )   In order to improve the safety of highway construction, the causes of accidents were explored based on the theory of safety engineering and combined with the characteristics of highway construction, through a large amount of investigation, qualitative and quantitative analysis of construction accident data. The risk factors affecting the safety of highway construction were preliminarily determined. Through the SP/RP investigation and analysis from six aspects such as technology, material and equipment, personnel, organization and management, environment and logistics, the evaluation index table of risk factors was established. On this basis, the membership function was established by the method of relative difference function, thereby the comprehensive relative membership matrix was constructed. Finally, the risk assessment grade of engineering case was obtained. The research results show that the model based on the relative difference function can quantify the risk assessment indexes which are difficult to quantify, and can adapt to the risk assessment under various conditions. It can effectively improve the accuracy and efficiency of expressway construction evaluation results, provide the basis for taking corresponding safety measures and ensure the construction safety. References | Related Articles | Metrics

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Influence Analysis of Cement Concrete Pavement Damage on Dynamic Load of Heavy-Load Vehicle CAO Yuanwen,WANG Dong,WANG Jianwen,YANG Xue 2020, 39(07): 86-91.  DOI: 10.3969/j.issn.1674-0696.2020.07.13 Abstract ( )   PDF (1048KB) ( )   Due to the low vibration damping effect of rigid pavement, as the vehicle load gradually increases, the damage of cement concrete pavement gradually increases. Therefore, taking Foton Ouma dual-axle vehicle as the research objective now, the whole vehicle dynamics model was established through the ADAMS software. The dynamic load changes of heavy-load vehicles under different road conditions were studied with three parameter variables: different stagger height, different driving speed and different body weight. The research shows that the influence of staggering road on vehicle dynamic load is significant. At the same height of the staggered platform, the dynamic load of the front wheel is larger than that of the rear wheel, and the maximum dynamic load of the front wheel is 2.35 times of the static load. At the same height of the staggered platform, as the vehicle speed increases, the dynamic load of the vehicle increases. When the staggering of the road is very serious, the road roughness becomes the main factor affecting the dynamic load of the vehicle, and the speed becomes the secondary factor. When the staggering of the road is small, the vehicle speed plays a decisive role in the change of vehicle dynamic load; the load has a significant effect on the dynamic load of vehicle. The greater the load, the greater the dynamic load of vehicle, but the smaller the dynamic load coefficient of vehicle. References | Related Articles | Metrics

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Effect of Self-melting Snow Agent on Performance of Asphalt Mixture ZHANG Zhengqi1, TANG Zhouming1,2, LI Yang1,3, WANG Dong4 2020, 39(07): 92-99.  DOI: 10.3969/j.issn.1674-0696.2020.07.14 Abstract ( )   PDF (3976KB) ( )   In order to analyze the effect of the addition of self-melting snow agent in the self-melting snow pavement on the road performance of asphalt mixture, the Mafilon (MFL) asphalt mixture with 0%, 30%, 60% and 100% dosage and the self-melting agent (ZRX) asphalt mixture were respectively subjected to rutting test, beam bending test, water stability test and self-made precipitation scouring test to compare the high temperature stability, low temperature crack resistance and water stability.The research results show that the snow-melting agent has adverse effect on the high and low temperature performance of asphalt mixture, but both of them meet the requirements of the specification.It is necessary to scour 48 hours before evaluating water stability of asphalt mixture with self-melting snow agent. The snow-melting agent affects the water stability of asphalt mixture greatly. The addition of 100% MFL asphalt mixture is even lower than the specification requirements,and the use of slaked lime or anti-stripping agent can significantly improve the water stability of the self-melting snow asphalt mixture,and the best addition is 1.5% or 0.5% respectively.The high temperature, low temperature and water stability of ZRX asphalt mixture are similar to those of MFL asphalt mixture with 60%. References | Related Articles | Metrics

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Numerical Simulation Analysis of Slope-Oriented Thermal Effect for Island-Shaped Permafrost Subgrade CHANG Jifeng1，CHEN Yanjun2，SUN Quansheng3 2020, 39(07): 100-107.  DOI: 10.3969/j.issn.1674-0696.2020.07.15 Abstract ( )   PDF (3003KB) ( )   There were great differences of ground temperature circumstance on both slope sides of subgrade and the underlying soil layers because of the highway direction in island-shaped permafrost areas, which caused the inhomogeneous thermal deformation of subgrade structure and brought about a series of serious subgrade diseases such as longitudinal cracking, thermal thawing, which threatened the driving safety directly. Mastering the slope-oriented difference characteristics was the premise of improving design quality and enhancing thermo-stability for permafrost subgrade. Therefore, based on the practical project, the slope-oriented thermal effect of island-shaped permafrost subgrade in high latitude and high cold regions was studied by using finite element numerical simulation method and applying different heat flux densities on both slope sides of subgrade. The research results show that the uneven change of subgrade thermal stability will become more obvious with the increasing temperature difference both of subgrade slopes. Based on the thermal response of subgrade displacement field with different heat flux conditions, the characteristics of slope-oriented thermal deformation and the possible diseases for island-shaped permafrost subgrade in different states are revealed. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

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Bridge to Nearby Wharf Capacity Loss Based on Grey Fuzzy LIU Yihua1, MA Lihua1,YUAN Yang2 2020, 39(07): 108-113.  DOI: 10.3969/j.issn.16740696.2020.07.16 Abstract ( )   PDF (1449KB) ( )   In order to ensure the navigation safety of wharfs near the bridge, the factors affecting the wharf capacity loss were analyzed, and the indexes of wharf capacity loss affected by the bridge were determined. A model of wharf capacity loss based on grey fuzzy was proposed. According to the membership degree of grey correlation degree, the weight of each factor was distributed and calculated by AHP. Taking Yongzhou Bridge as an example, the feasibility of the method was verified, and 5 effective index factors were selected to complete the quantitative analysis of wharf capacity loss. The proposed model is helpful to strengthen the safety planning and management of wharf and ensure the navigation safety of ships in the bridge area, which provides a scientific reference for the route selection of the bridge location. References | Related Articles | Metrics

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Simulation Research on Shared Berth Scheme of Port Groups Based on SD ZHENG Hongxing1，HE Guoyan1,3，QIN Ying2,3 2020, 39(07): 114-120.  DOI: 10.3969/j.issn.1674-0696.2020.07.17 Abstract ( )   PDF (1632KB) ( )   With the development of the port group, more and more attentions have been paid to berth sharing resources within the port group on the premise of reducing environmental pollution. In order to develop an effective berth sharing scheme for port group, based on the analysis of the structure of port group economy system and the causal feedback, the method of system dynamics (SD) was adopted to divide the system into three subsystems: port group economy, environmental pollution and ports. And then a simulation model of the shared berths in port group was established. Taking Liaoning port group as an example, the simulation was carried out to compare and analyze the environment pollution status of the port group under non-shared berth mode and multiple shared berth modes. The simulation results show that, according to the through capacity of each port in the port group and the proportion of domestic and foreign trade goods, setting a reasonable proportion of the shared berths for each port can effectively reduce the final amount of pollution in the port group and realize the green economic growth of the port group. References | Related Articles | Metrics

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Evolution of Urban Green Space and Its Carbon Sequestration Benefit in Nanan District of Chongqing ZHOU Wei1,2 , LI Haoran1, HUANG Lu1, YUAN Yiyuan1, XIE Yuhao1 2020, 39(07): 121-125.  DOI: 10.3969/j.issn.1674-0696.2020.07.18 Abstract ( )   PDF (1996KB) ( )   The study on spatial distribution and carbon sequestration capacity of urban green space is of great significance to the evaluation of ecological service value. Taking Nanan District of Chongqing as the research area, the Landsat8 remote sensing images of 2013 and 2016 were supervised and classified, and the land use data of the two periods were obtained, and then the transfer matrix analysis of land use was carried out. Finally, the ecological benefits of urban green space in carbon sequestration were quantitatively estimated by using CITYgreen model. The results show that: (1) from 2013 to 2016, the construction land in Nanan District has increased by 1025.01 ha, while the urban green space has decreased by 333 ha as a whole; (2) the decrease of urban green space in Nanan District is mainly reflected in the conversion of forest land to construction land and cultivated land; (3) the annual carbon sequestration of urban green space in Nanan District in 2013 and 2016 are converted into ecological benefits of about 4.782 million yuan and 4.5436 million yuan. The research results reveal the spatial distribution, evolution and carbon sequestration benefits of urban green space in Nanan District, so as to provide a scientific basis for governments decision. References | Related Articles | Metrics

Vehicle &Electromechanical Engineering

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LQG Control Method of Gravitational Search Algorithm of Vehicle Active Suspension LI Jun1, 2， ZHOU Wei1, 2， ZHANG Shiyi1 2020, 39(07): 126-131.  DOI: 10.3969/j.issn.1674-0696.2020.07.19 Abstract ( )   PDF (679KB) ( )   In order to solve the problem that the weights of the LQG controller performance index function were not easy to determine, the suspension performance index was used as the objective function, and the LQG optimal control algorithm was applied to control the semi-active suspension. The gravity search algorithm was used to optimize the weight of performance index function, and the optimization controller was built. Finally, an optimization method using the gravity search algorithm was proposed. At the same time, a 2 degree-of-freedom 1/4 active suspension vehicle model was established, and its gravitational search LQG control was simulated and compared with the traditional LQG control results. The results show that the proposed gravitational search LQG control method can improve the ride comfort and steering stability of the vehicle at the same time. References | Related Articles | Metrics

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Dynamic Characteristics Analysis of Tramcars under Different Load Conditions DU Zixue，HUANG Long 2020, 39(07): 132-137.  DOI: 10.3969/j.issn.1674-0696.2020.07.20 Abstract ( )   PDF (956KB) ( )   In view of the characteristics of small curve radius, many bends and large slope in mountainous cities, a 100% low-floor tramcar with a three-module floating car with a small diameter rigid wheelset was adopted in order to make the tramcar smoothly pass the small curve radius road condition in mountainous city. With the help of multi-body dynamics software SIMPACK, the dynamic model of the proposed model was established, and the dynamic performance of the proposed model was simulated under no-load and full load conditions. The simulation results show that when the tram passes through the uneven straight track at the speed of 80km / h, it has good operation stability and stability. With the increase of curve radius, the curve negotiation performance of the vehicle gradually improves. When the minimum curve radius is 25 m, the curve negotiation performance can meet the requirements and can pass the small radius curve better. Moreover, when passing through the same radius curve, the various curve negotiation performance indexes under no-load condition are obviously better than those under full load condition. The performance index of each curve under no-load condition is obviously better than that under full-load condition. References | Related Articles | Metrics

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Numerical Simulation of Flow and Heat Transfer Coupling Characteristics of Marine Fuel Oil DUAN Jimiao1, LIU Huishu1, HE Manqiu2, XU Shuo3, LI Jiang1 2020, 39(07): 138-146.  DOI: 10.3969/j.issn.1674-0696.2020.07.21 Abstract ( )   PDF (3575KB) ( )   In the process of heating and transporting fuel oil by the motor pipeline laid with bare pipe, due to the effect of low temperature and strong heat exchange in winter, the fuel oil has large heat loss, fast temperature drop, rising viscosity, large pressure drop, loss of liquidity, and is prone to condensation accidents. The flow and heat transfer process of fuel oil in the test section of the loop test device was simulated numerically by using the fuel oil produced by a refinery of CNPC in Qingdao as the experimental medium, and a three-dimensional coupled model of flow and heat transfer was established. The computing region was divided by a staggered grid system. The convection-diffusion equation was discretized by using second order upwind and the sub-relaxation alternating direction block iterative method was used to solve the discretization equation. Numerical simulation results show that: the oil temperature near the tabe wall decreases due to the effect of cooling water on the outer wall of the test section, and the closer to the tube wall, the more the temperature decreases. From the inlet to the outlet of the oil flow, the temperature of the inner wall of the pipe appears a floating drop, and the thickness of the thermal boundary layer of the fuel oil decreases. References | Related Articles | Metrics