一种计算燃气轮机透平叶片温度分布和冷却空气需求量的修正的解析模型

现代燃气轮机冷却技术非常复杂,该文针对传统的计算透平叶片冷却空气量模型的不足,基于热力学、传热学理论,对以往模型进行修正和改进,建立一种考虑了气膜冷却和热障涂层(thermal barrier coating,TBC)的修正的解析模型。通过对不易测得的叶片内部冷却通道参数的合理处理,模型可计算得出叶片的冷却空气需求量以及温度分布情况,并通过算例进行了计算分析,得到较合理的结果。该模型可以用于燃机叶片温度实时监测以提高燃机机组运行的安全性,还可对燃机设计、性能分析和冷却空气量分配控制提供一些参考。

A Modified Analytical Model to Calculate Temperature Distribution of Gas Turbine Blade and the Cooling Air Required

The modern gas turbine’s cooling technology is very complex.Based on the principles of thermodynamics and heat transfer,this paper brought up a modified analytical model that considered the film cooling and thermal barrier coating(TBC),which aimed at the shortcomings of the traditional computational models of calculating the cooling flow required for turbine blades.This model can calculate the cooling air required for blades,and the temperature distribution of the blade surfaces.By dealing with the blade internal cooling parameters,the model can be realized and acquire reasonable results.This model can not only be used for real-time monitoring of gas turbine blade temperature and can also be used to assist in gas turbine design,the performance analysis,and cooling flow’s distribution control.