G4135柴油机辐射多区多维模型(Ⅱ)

Multi-Zone & Multi-Dimensional Radiation Heat Transfer Model of G4135 Diesel Engine (Ⅱ)

提出了一种计算ω型燃烧室火力面辐射热流量分布的数学方法 .计算时用蒙特卡洛法不直接求解辐射能量方程的多重积分 ,而是通过构造概率模型计算积分的统计值 ,它能很好地用于计算复杂形体的空间辐射角系数 .结合缸内辐射多区多维模型 ,将ω型燃烧室进行了数学逼近处理 。

A new model for calculating spatial distribution of radiation heat flux on ω combustion chamber diesel engines was developed. The model uses Monte Carlo method, a statistics mathematical model, to calculate geometrical shape/absorption factors. It does not need to directly solve complex numerical integration equations of radiation transfer. Combining a multizone and multidimensional radiation heat transfer model in the proposed diesel engine, the surface of ω combustion chamber was divided into a set of elements. With good agreement between experiments and computational results, the computation model is available by various shape combustion chambers to provide directions for engine heat transfer.