SIMULATION OF A CONJUGATE PROBLEM OF FRICTION AND HEAT TRANSFER IN TRANSPIRATION COOLING OF GAS TURBINE BLADES

摘要

A numerical calculation model of heat transfer in the nozzle blades of high-temperature gas turbines with transpiration cooling has been developed. The model includes conjugate numerical calculation of convective heat transfer, heat transfer in the transpiration passages, and conductive heat transfer in the solid body of a blade. The results that characterize the structure of external flow, flow in the transpiration passages and in the blowing areas are being discussed. Distributions of the cooling efficiency, heat transfer rates, friction characteristics per turbine nozzle blade circuit are given. The possibility of obtaining an acceptable wall temperature level at a turbine-inlet temperature of 1800 K and cooling medium consumption is defined. It is noted that loss factor is 1.6% higher than in a standard blade.