关键词: 管道工程, 舰用燃料油, 流动传热耦合特性, 数值模拟, 机动管线

Abstract: 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.

Key words: pipeline engineering, marine fuel oil, flow and heat transfer coupling characteristics, numerical simulation, mobile pipeline