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

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

为研究不同燃气输运特性计算方法对涡轮对流换热的影响,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。选取4种常用的计算分子黏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2200 K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1000 K及1500 K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%。对涡轮对流换热研究应考虑不同燃气组分输运特性计算方法对涡轮叶栅对流换热影响。提出的算法对涡轮对流换热问题具有一定的指导意义。

To investigate the influence of different methods of calculating transport properties of combustion gas on convective heat transfer over turbines,an algorithm was proposed to calculate the influence of different gas component transport characteristics on convective heat transfer.In this method,four commonly used methods for calculating gas transport characteristics such as molecular viscosity coefficient and thermal conductivity were selected for analysis.The results show that different calculation methods of gas component transport characteristics have certain influence on the convective heat transfer of flat plate and turbine cascade.The maximum difference of Nusselt number of local convective heat transfer increases from 2.7%to 4.0%at a given inlet temperature from 1000 K to 2200 K and from 4.58%to 9.70%at a given inlet temperature of 1000 K to 1500 K,respectively.For convective heat transfer over turbines,the effect of different methods of calculating transport properties of combustion gas should be considered.The algorithm presented has certain value on the convective heat transfer over turbines.