不同燃气输运特性计算方法对涡轮平面叶栅对流换热的影响

提出一种不同燃气组分输运特性计算方法对对流换热影响的算法。根据此方法,选取4种常用的计算分子粘性系数及热导率等燃气输运特性的方法进行分析。结果表明,不同燃气组分输运特性计算方法对平板和涡轮平面叶栅的对流换热具有一定影响。在给定的入口温度为1000 K及2200K时,平板当地对流换热的努赛尔数的最大差别分别从2.7%增大到4.0%；在给定的入口温度为1000K及1500K时,涡轮平面叶栅当地对流换热的努赛尔数的最大差别分别从4.58%增大到9.70%。

Influence of Different Methods of Calculating Transport Properties of Combustion Gas on Convective Heat Transfer over Turbine Cascade

A method for evaluating the influence of different transport properties of different combustion gas components on convective heat transfer was proposed in this paper. Based on the proposed method, four commonly approaches for calculating molecular viscosity coefficient and thermal conductivity were selected to investigate the effect of different combinations of the approaches on convective heat transfer. The results show when the inlet temperatures are 1000K and 2200K, the local Nusselt number of the flat plate increases from 2.7% to 4.0%, and when the inlet temperatures are1000K and 1500K, the local Nusselt number of turbine cascade increases from 4.58% to 9.70%, respectively.