Production methods of gas turbine

Abstract

An object is to reduce the compressor flow rate in comparison with the reference model while maintaining a compression ratio equivalent to that in the reference model. Annulus areas required of a compressorof a derivative gas turbineare determined based on a compressor flow rate and a compression ratio required of the compressorof the derivative gas turbine. Under the condition that the annulus area of each stage of the compressorbecomes equal to the determined annulus area, an inner radius increment and an outer radius decrement of an initial stageare determined, the inner radius increment and the outer radius decrement of each of intermediate stages-are determined so that the inner radius increment is not more than the inner radius increment of the previous stage and the outer radius decrement is not less than the outer radius decrement of the previous stage, and the inner radius increment and the outer radius decrement of a final stageare determined so that the outer radius decrement is not less than the inner radius increment. The compressoris designed by updating design data of components of the reference compressorthat deviated from the specifications due to the determination of the inner radius increment and the outer radius decrement so that the updated design data fulfill the specifications in each of the stages-