THE ADVANCED COOLING TECHNOLOGY FOR THE 1500-DEGREES-C CLASS GAS-TURBINES - STEAM-COOLED VANES AND AIR-COOLED BLADES

It is very essential to mise the thermal efficiency of combined cycle plants from the viewpoint of energy saving and environmental protectio n, Tohoku Electric Power Co., Inc., and Toshiba Corporation in Japan h ave jointly studied the next generation of combined cycle systems usin g 1500 degrees C class gas turbine. A promising cooling technology for the vanes using steam was developed, The blades are cooled by air, ad opting the impingement cooling, film cooling and so on, The cooling ef fectiveness was confirmed both for the vanes and the blades using a ho t wind tunnel. This paper describes the design features of the vanes a nd the blades, and the results of the verification tests using the hot wind tunnel.