This paper presents a mathematical model for computing the effects of air humidity, fuel composition, and gas dissociation on gas turbine engine performance and its actual application to a computer program for simulation of gas turbine engine performance. A new generalized modular program to allow for these effects was built, which is called ‘TURBOFLEXI’. It can simulate arbitrary gas turbine engine with a variety of configurations, at any air humidity conditions, with any fuel composition and gas dissociation or even water injection. The program was examined by test data and published data.

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