引言近年来,湍流燃烧模型和计算方法的研究进展很快,其中概率密度函数(PDF)方法就是其中的一种比较新的方法。PDF方法主要是通过求解速度和化学热力学参数的联合概率密度函数的输运方程来求解湍流燃烧问题的。在这个方程中,与湍流输运和化学方应速率的有关的项都是以封闭的形式出现,避免了建立模型模拟,因此得到的结果更加精确,但是与分子黏性和压力梯度有关的项还需要模拟。同时,知道了速度和化学热力学参数的联合密度函数之 Introduction In recent years, the research on turbulent combustion models and calculation methods has progressed rapidly. Among them, the PDF method is a relatively new method. The PDF method solves the problem of turbulent combustion mainly by solving the transport equation of the joint probability density function of velocity and chemical thermodynamic parameters. In this equation, the terms related to both turbulent transport and chemical-induced velocity occur in a closed form, avoiding the establishment of model simulations and hence the more accurate results, but the terms related to molecular viscosity and pressure gradient Also need simulation. At the same time, we know the joint density function of velocity and chemical thermodynamic parameters