COOLING AIR TAKING OUT PART OF DIFFUSER OF COMPRESSOR STAGE OF GAS TURBINE IN HOUSING SIDE

摘要

PROBLEM TO BE SOLVED: To prevent generation of a dead water area in a diffuser so as to reduce a loss and increase stage efficiency in the diffuser. SOLUTION: In a cooling air taking out part of a diffuser part in a last radial compressor stage of a gas turbine, compressed air is taken out through a cooling air emission part 10 in a radial compressor stage which comprises a turbine impeller and a diffuser with blades. The cooling air taking out part is constructed, such that cooling air is taken out through an opening 6 in a housing side 20.1 of the diffuser in one side and then through a cooling air passage 10 so as to be supplied to a portion exposed to a high heat gas, especially to an outer wall of a Y-shaped pipe. The compressed air is introduced through a cooling air hole 19 in a diffuser blade 3 to a diffuser outside 20. 2.