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

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.