高负荷跨音速复合气冷涡轮叶片的设计与计算

DESIGN AND CALCULATION OF COMPOSITE AIR-COOLED BLADES IN A HIGHLY-LOADED TRANSONIC TURBINE

本文提出了一套跨音速复合式气冷涡轮叶片内冷气流量分配、温增、内外换热系数和温度场的计算方法 ,对设计的“冲击 -对流 -气膜”多种冷却方案进行了计算。与实测值比较 ,验证了本计算方法的可靠性和精确度 ,择优选取了四套叶片内冷结构 。

A set of calculation methods is presented for predicting coolant mass flow distribution,temperature rise、heat transfer coefficients (internal and external) and temperature field of transonic turbine blades with impingement-convection-film cooling.Various air-cooled schemes has been calculated,in result four internal air-cooling structures in turbine blades have been chosen accordingly and designed elaborately.The results of calculation according to actual parameters are compared with the measured wall temperature distributions over turbine blades.Maximum and minimum deviations of the local wall temperature over the turbine vanes and blades are 9 8% and 2%,6 4% and 1 3% respectively.The methods are verified to be credible and accurate.