柴油机缸内辐射传热的多维数值模拟

A MutiDimensional Numerical Simulation of Radiation HeatTransfer in Cylinder of Diesel Engines

本文建立了柴油机缸内辐射传热多维数值计算模型，包括：（１）燃烧模型；（２）几何分区模型；（３）辐射温度模型；（４）碳粒浓度模型；（５）碳粒吸收系数模型；（６）辐射全交换面积的蒙特卡罗方法计算模型。针对缸内不规则的几何形状，将计算区域分为１０个表面区和４个气体区，考虑了具有发射和吸收特性的参与性介质存在的情况，并对用蒙特卡罗方法得到的计算结果进行了光顺，从而得到了缸内辐射传热各参量随曲轴转角变化的空间分布。

お? A Multidimensional theoretical model of radiation heat transfer in cylinder of diesel engines has been developed,which includes combustion,geometrical description,radiation temperature,soot concentration,absorption coefficient and total exchange areas submodels.In this code,a system of incylinder is divided into 10 surface zones and 4 gas zones.Both the absorbingemitting media and the complex structure of the cylinder can be treated with ease.The MonteCarlo method with smoothing technique is used to calculate radiative total exchange areas.The Mutidimensional results of radiative parameters in diesel combustion chamber varying with crank angles can be obtained.