带储能弹簧自由活塞发动机运行特性研究

doi:10.3969/j.issn.1674-0696.2021.11.20

重庆交通大学学报（自然科学版） ›› 2021, Vol. 40 ›› Issue (11): 135-141.DOI: 10.3969/j.issn.1674-0696.2021.11.20

• 交通装备 • 上一篇

带储能弹簧自由活塞发动机运行特性研究

李延骁，杨君，徐传燕

(山东交通学院汽车工程学院，山东济南 250357)

收稿日期:2020-05-28 修回日期:2020-07-10 发布日期:2021-11-24
作者简介:李延骁(1981—)，男，山东济南人，副教授，博士，主要从事车辆发动机工程方面的研究。E-mail：liyanxiao@163.com
基金资助:
国家自然科学基金项目（61803231；51405272）；山东省高等学校青创科技计划项目（2020KJB002）；山东省自然科学基金项目（5207052090）

Operation Characteristics of Free Piston Engine with Energy Storage Spring

LI Yanxiao, YANG Jun, XU Chuanyan

(School of Automotive Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China)

Received:2020-05-28 Revised:2020-07-10 Published:2021-11-24

摘要/Abstract

摘要： 为进一步提高自由活塞发动机(FPE)运行频率、指示效率及稳定性等性能指标，提出了一种带有储能弹簧的FPE内燃发电系统设计方案。对其工作原理进行了分析，建立了系统动力学-缸内热力学耦合计算模型，并试验验证了模型有效性。通过数值仿真研究了储能弹簧对FPE系统运行特性的影响，结果表明：随储能弹簧刚度增大，FPE活塞位移与速度趋于正弦变化曲线，进气口与排气口打开时刻推后；储能弹簧刚度越大，缸内峰值压力与机械效率越低，活塞速度峰值、系统运行频率及输出功率越高，储能弹簧刚度在100~200 kN/m时指示效率较高；此外，设置储能弹簧可降低FPE缸内峰值压力与压缩比波动幅度，有效抑制燃烧循环波动与偶发性失火对系统运行稳定性影响。

关键词: 车辆工程；自由活塞；储能弹簧；耦合；数值模拟

Abstract: In order to improve the free piston engine performance such as operating frequency, indicated efficiency, operation stability, a design scheme of FPE internal combustion power generation system with energy storage spring was proposed. The working principle of the proposed system was analyzed. The coupling calculation model of system dynamics and in-cylinder thermodynamics was established, and the effectiveness of the proposed model was verified by experiments. The influence of energy storage spring on the operating characteristics of FPE system was studied by numerical simulation. Results show that: with the increase of energy storage spring stiffness, the displacement and velocity of FPE piston tend to sinusoidal variation curve, and the opening time of inlet and exhaust ports is pushed back; the greater the stiffness of the energy storage spring, the lower the peak pressure and mechanical efficiency in the cylinder, the higher the peak piston speed, system operating frequency and output power, and the higher the indicating efficiency when the stiffness of the energy storage spring is 100 ~ 200 kN/m. In addition, the setting of energy storage spring can reduce the fluctuation range of peak pressure and compression ratio in FPE cylinder, and effectively restrain the influence of combustion cycle fluctuation and accidental misfire on the operation stability of the system.

Key words: vehicle engineering; free piston; energy storage spring; coupling; numerical simulation

中图分类号:

U464
TK 401

李延骁，杨君，徐传燕. 带储能弹簧自由活塞发动机运行特性研究[J]. 重庆交通大学学报（自然科学版）, 2021, 40(11): 135-141.

LI Yanxiao, YANG Jun, XU Chuanyan. Operation Characteristics of Free Piston Engine with Energy Storage Spring[J]. Journal of Chongqing Jiaotong University(Natural Science), 2021, 40(11): 135-141.

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带储能弹簧自由活塞发动机运行特性研究

Operation Characteristics of Free Piston Engine with Energy Storage Spring

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