PURPOSE: To unnecessitate an ejector and a bypass flowpath by connecting a flowpath for supplying fuel gas to the suction side of a compressor and internally providing a catalyst layer promoting a combustion reaction between fuel gas and oxygen gas, in a combustion apparatus.

CONSTITUTION: A fuel gas supplying flowpath 4 is connected to the suction side of the compressor 1, and a combustion apparatus 5 is interposed in an air supply path 3 leading from the compressor to a gas turbine 2 and a flowpath 6 for recovering high pressure hot wind is provided and high-pressure hot wind is supplied to a main combustion apparatus 7. A catalyst layer 5a is internally provided in the combustion apparatus 5. By this arrangement, the construction of the high pressure hot wind generator can be simplified and cost-down thereof can be performed.