Verification of Turbo-Shaft Engine Performance Uncertainty Model and Applications

In order to make the turbo-shaft engine performance uncertainty model utilized in engineering design, using the average verification method, the turbo-shaft engine performance uncertainty model is verified with the engine performance temperature characteristics test data, and the output power verification root mean square error is 2.1%, the SFC is 1%. Next, the selection of cycle parameters of a new turbo-shaft engine and free turbine efficiency margin design are carried out based on the verified model. Results show that, the current ranges of engine cycle parameters and levels of component performance cannot satisfy the requirements of engine performance targets once the change of turbine stage efficiency generated by the cooling air mixing with the main gas stream and the change of turbine cooling flow caused by the increase of the total turbine inlet temperature are considered. Under the first control scheme which the relative speed of the gas generator is kept on a certain constant value, the free turbine efficiency margin increases 1.8%, the probabilities of success of output work and SFC can exceed 95% together.