燃烧室凹坑形状对汽油转子发动机燃烧过程的影响

赵云龙; 邓晰文; 冯战; 朱蕊东; 苏小斌

doi:10.3969/j.issn.1001-2222.2022.02.007

车用发动机 ›› 2022, Vol. 0 ›› Issue (2) : 40. DOI: 10.3969/j.issn.1001-2222.2022.02.007

栏目

燃烧室凹坑形状对汽油转子发动机燃烧过程的影响

赵云龙¹，邓晰文^1,2，冯战¹，朱蕊东^1,2，苏小斌¹

作者信息 +

Effects of Combustion Chamber Pit Shape on Combustion Process for Gasoline Rotary Engine

ZHAO Yunlong¹，DENG Xiwen^1,2，FENG Zhan¹，ZHU Ruidong^1，2，SU Xiaobin¹

Author information +

文章历史 +

摘要

针对转子发动机缸内燃料燃烧效果不佳的问题，以一款预混式汽油转子发动机作为研究对象，采用计算流体力学的方法，建立转子发动机缸内流动与燃烧的三维数值仿真模型，并利用试验结果进行了对比验证。在此基础上，选取敞口式、直口式和缩口式3种不同类型的燃烧室凹坑，研究了燃烧室凹坑形状对缸内压力、温度、火焰传播及NO生成的影响。结果表明：在一定工况下，燃烧室凹坑形状对缸内燃料的燃烧过程有明显影响。其中，缩口式凹坑缩口处附近燃料不易被点燃，缸内燃料燃烧效果最差；敞口式可以更好地组织缸内的混合气流动，燃烧过程中利用了燃烧室内部较快的气体流速和高速流区对火焰的加速作用，燃料燃烧过程中火焰传播速度快，压力升高率大，进而增大了缸内整体燃烧速率；敞口式比直口式缸内最高燃烧压力提高6.8%，燃油消耗速率提高10.8%，NO质量分数仍在0.5%左右。

Abstract

In order to solve the problem of poor fuel combustion inside the rotary engine cylinder, a three-dimensional numerical simulation model of flow and combustion inside the cylinder of premixed gasoline rotary engine was established by the method of computational fluid dynamics, and the experimental results were compared and verified. Based on the combustion chamber pits of open type, straight-mouth type and narrow-mouth type, the influences of combustion chamber pit shape on the in-cylinder pressure, temperature, flame propagation and NO generation were researched. The results show that the combustion chamber pit shape has an obvious effect on the combustion process of fuel inside the cylinder under certain conditions. The fuel combustion effect of narrow-mouth type pit is the worst because the fuel is difficult to ignite near the shrink mouth. The open type pit can better organize the mixed gas flow inside the cylinder. During the combustion process, the faster gas flow rate and highspeed flow zone are used to promote the flame. The flame propagation speed becomes fast, the pressure rise rate becomes large, and hence the overall combustion rate in the cylinder accelerates. Compared with the straightmouth pit, the maximum combustion pressure of open type pit increases by 6.8%, the fuel consumption rate improves by 10.8%, and the mass fraction of NO still keeps about 0.5%.

导出引用

赵云龙，邓晰文，冯战，朱蕊东，苏小斌. 燃烧室凹坑形状对汽油转子发动机燃烧过程的影响[J]. 车用发动机. 2022, 0(2): 40 https://doi.org/10.3969/j.issn.1001-2222.2022.02.007

ZHAO Yunlong，DENG Xiwen，FENG Zhan，ZHU Ruidong，SU Xiaobin. Effects of Combustion Chamber Pit Shape on Combustion Process for Gasoline Rotary Engine[J]. Vehicle Engine. 2022, 0(2): 40 https://doi.org/10.3969/j.issn.1001-2222.2022.02.007