汽油机燃烧放热特征参数的量化研究及简化数模开发  

Quantitive Research on Combustion Heat Release Characteristics of a Kind of Gasoline Engines and Development of Its Simplified Numerical Model

作　　者：朱国辉 刘敬平 柯文辉 付建勤 詹樟松 刘斌 

机构地区：[1]湖南大学先进动力总成技术研究中心,长沙410082 [2]长安汽车动力研究院,重庆401120

出　　处：《内燃机工程》2017年第6期53-60,66,共9页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助(51376057);国家科技支撑计划项目(2014BAG10B01)~~

摘　　要：基于多台汽油机性能对标试验数据的二次开发,总结出了此类发动机的燃烧效率、燃烧持续期、燃烧放热率曲线的形状参数随发动机转速、负荷、过量空气系数等运行参数的变化规律。结果表明:燃烧效率几乎只与过量空气系数相关,二者有明确的线性关系;燃烧品质参数m值主要与发动机的负荷相关,与发动机其他设计及运行参数的关系较弱,在很低负荷时m值随发动机负荷的增大而稍微增加,而当负荷高到一定值时m值稳定在2.0左右不变;燃烧放热率曲线形状呈对称形态;燃烧持续期在低负荷时随发动机负荷的增高而减小,但当平均有效压力(BMEP)大于0.8MPa后,燃烧持续期基本稳定不变。燃烧持续期随发动机运行参数的变化趋势,可用简单的线性关系来表述,并有较好的预测精度。Based on systematical engine performance bench marking tests on a few gasowell as on further development and regression analysis of the experimental data, combustion characteristics, such as combustion efficiency, combustion duration, influence factor of heat release rate curve, weresummarized as the functions of engine operational parameters, such as speed, load, excess air/fuel ratio,spark timing. Results show that the combustion efficiency is almost only relevant to the excess air coefficientwith a good linear relation. Moreover, the value of combustion quality parameter ： is mainly related toengine load and has a weaker relationship with other engine design and operational parameters. When engine load is very low, the value m increases slightly with load. However, when the load is up to a certain value, the value m is stable at the constant of 2. 0 and the heat release rate curve is symmetric. The combustion duration decreases with the increase of engine load at low load, but it is almost stable and constant when theload （BMEP） is higher than 0. 8 MPa. The trend of combustion duration change with other engine operational parameters can be illustrated by a simple linear relation with good prediction accuracy. Theresearch results provide a relatively accurate simplified numerical model for the simulation of the performances of turbocharged direct injection gasoline engines.

关 键 词：汽油机 燃烧 放热特性 影响因素 简化数模 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]