直喷式柴油发动机缸内三维温度场的计算与试验  

SIMULATION AND EXPERIMENT FOR THREE-DIMENSIONAL COMBUSTION TEMPERATION FIELD IN DIRECT-INJECTION DIESEL ENGINE

作　　者：刘永峰[1] 张幽彤[1] 秦建军[2] PETERS Nobert 

机构地区：[1]北京理工大学机械与车辆工程学院 [2]北京交通大学机械与电子控制工程学院,北京100044 [3]亚琛工业大学工程机械所

出　　处：《机械工程学报》2007年第2期196-201,共6页Journal of Mechanical Engineering

基　　金：北京市教委科研项目(KM200710016013);北京市优秀人才培养(20051D0501705);北京建筑工程学院2005年专项科研基金(1005039)资助项目

摘　　要：为计算直喷式柴油发动机缸内燃烧温度,提出利用理想混合比质量分数空间来计算缸内温度场。通过引入混合比质量分数基本概念,推导出各种组分与混合比质量分数的关系。通过引入小火焰的假设,分析典型非预混合小火焰结构,推导出绝热状况下缸内温度与混合比质量分数的关系。在理想混合比质量分数空间坐标系下建立新的温度输运方程,提供一种将湍流化学反应场和湍流运动场分离开的方法。经过一系列参数的输入,计算出缸内温度与扩散尺度速率关系,缸内温度与混合比质量分数关系以及缸内火焰温度分布,试验验证了计算结果。为计算直喷式柴油发动机缸内燃烧温度以及污染物成分提供新的计算方法。To calculate the combustion temperature in direct-injection diesel engine the mixture fracture space is presented. The mixture fracture function is introduced and the connections between species and mixture fraction are deduced. The classic non-premixed flame structure is analyzed based on flamelet assumptions and the connections between temperature and mixture fraction are carried out in the adiabatic condition. So the temperature equation is deduced with mixture fraction equation through the space coordinates change, and a way of separating the numerical effort associated with the solution of the turbulent flow field from that of solving the chemistry is offered. The connections between temperature and scalar dissipation rate and between temperature and mixture fraction and the flame temperature profile are carried out through a series of parameters. Further the calculational results are compared with the experiment data. A new way to simulate combustion temperature and further for pollutants in direct-injection diesel engine is presented.

关 键 词：直喷式柴油发动机 小火焰假设 湍流燃烧 混合比质量分数 

分 类 号：O643.2[理学—物理化学]