Author : Pranay Pudake, A. M. Elgandelwar and Mandar M.Lele

A gas turbine works on a Brayton cycle. The efficiency of an ideal Brayton cycle depends on the compression ratio and compression ratio is depends on the inlet temperature of the gas entering the turbine. If the inlet temperature of gas increases then the efficiency of the Brayton cycle increases. But the inlet gas temperatures has a limit due to the physical properties of the turbine blades. By sophisticated cooling technique and introduction of high temperature withstanding materials, this limitation can be overcome to a great extent. In this paper, various general types of cooling technologies used for cooling the turbine blades are explained. Also new recent types of cooling techniques for gas turbine, different new technology used in gas turbine blade material are explained with case study.

Keywords: Gas turbine engine, Compressor, Turbine, blade, Heat transfer enhancement etc.