用直接模拟蒙特卡罗法求高温混合气体的热传导系数

THE STUDY ON THERMAL CONDUCTIVITY OF HIGH TEMPERATURE REAL GAS BY THE DIRECT SIMULATION MONTE CARLO METHOD

本文在局域热平衡条件下， 从传输现象产生的机理出发， 建立了气体热传导系数数值实验的物理模型。采用ＤＳＭＣ法， 对高温混合气体热传导系数的实验过程进行数值模拟。考虑了真实气体的化学反应、内部自由度的激发等， 对高温（２０００－１００００Ｋ） 真实气体混合物的热传导系数的实验过程进行了数值模拟。获得了纯空气组元的真实热传导系数。经与热传导系数实测数据 （４７３－１４７３Ｋ） 和国外最新计算结果 （２０００～１００００Ｋ） 的比较表明， 本文提出的粒子模型和概率模型是正确的， 计算方法有较好的精度。在此基础上， 对热传导系数的非平衡性进行了分析。

Under local equilibrium Hypothesis,this paper set up the physical model of numerical experiment on thermal conductivity of mixed high temperature gas.By means of DSMC,the computer aided experiment was conducted by the generation mechanism of the conductivity.Taking the chemical reaction of real gas,the exciting of internal freedom of particles into consideration,experimental process of the gas mixed conductivity at high temperature (2000 10000K) was simulated,and got real conductivity of pure air components.The comparison with the real measured data (473 1473K) and the latest data abroad (2000~10000K),showed that the particle model and probability model proposed in this paper are right and the computation method produces fairly high precision.On the basis of those above,the non equilibrium property of conductivity was analyzed.