冲程缸径比对汽油机缸内流场影响的研究*

doi:10.19562/j.chinasae.qcgc.2018.09.003

汽车工程 ›› 2018, Vol. 40 ›› Issue (9): 1014-1020.doi: 10.19562/j.chinasae.qcgc.2018.09.003

冲程缸径比对汽油机缸内流场影响的研究^*

高莹,谢天驰,门欣,徐英健,费孝恒

吉林大学,汽车仿真与控制国家重点实验室,长春 130025

收稿日期:2017-08-02 出版日期:2018-09-25 发布日期:2018-09-25
通讯作者: 高莹,教授,博士,E-mail:gaoying@jlu.edu.cn
基金资助:
国家科技支撑计划(2015BAG05B00)资助

A Study on the Effect of Stroke-to-Bore Ratio on Gasoline Engine's Flow Field

Gao Ying, Xie Tianchi, Men Xin, Xu Yingjian & Fei Xiaoheng

Jilin University, State Key Laboratory of Automobile Simulation and Control, Changchun 130025

Received:2017-08-02 Online:2018-09-25 Published:2018-09-25

摘要/Abstract

摘要： 为探究冲程缸径比对汽油机缸内流场的影响,保证其它条件相同,将某三缸进气道喷射汽油机模型的冲程缸径比改为0.7和0.9(分别设为方案1和方案2),原机计算模型冲程缸径比为1.05(设为方案3)。利用AVL-Fire软件对3种计算方案在2 000r/min低负荷工况和3 800r/min全负荷工况下的进气及燃烧过程进行瞬态数值模拟计算。对比不同计算方案的缸内速度场、湍动能场和瞬时放热率。结果表明,在一定范围内,适当增加冲程缸径比,能够提高缸内滚流强度,从而使点火时刻湍流强度增大且分布良好,瞬时放热率更高,燃烧速度更快。

关键词: 汽油机, 冲程缸径比, 滚流, 湍动能, 数值模拟

Abstract: To investigate the effect of stroke-to-bore ratio on in-cylinder flow field, the stroke-to-bore ratio of a three-cylinder port fuel injection gasoline engine model is changed to 0.7 and 0.9 (set as scheme 1 and scheme 2) with the other conditions the same, and the stroke-to-bore ratio of the original engine is 1.05 (set as scheme 3). Transient numerical simulation on the intake and combustion process of the three computational schemes at 2000r/min low load and 3800r/min full load is conducted using the software AVL-Fire. The velocity field, turbulent kinetic energy field and heat release rate of the three different computational schemes are compared. Results show that within reasonable limits, the appropriate increase of stroke-to-bore ratio can enhance the intensity of in-cylinder tumble, and hence improve the intensity and distribution of turbulence at ignition timing, achieving greater heat release rate and faster combustion

Key words: gasoline engine, stroke-to-bore ratio, tumble, turbulence kinetic energy, numerical simulation

高莹,谢天驰,门欣,徐英健,费孝恒. 冲程缸径比对汽油机缸内流场影响的研究^*[J]. 汽车工程, 2018, 40(9): 1014-1020.

Gao Ying, Xie Tianchi, Men Xin, Xu Yingjian & Fei Xiaoheng. A Study on the Effect of Stroke-to-Bore Ratio on Gasoline Engine's Flow Field[J]. , 2018, 40(9): 1014-1020.

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冲程缸径比对汽油机缸内流场影响的研究^*

A Study on the Effect of Stroke-to-Bore Ratio on Gasoline Engine's Flow Field

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