Abstract:

The main difficult in startup procedure modeling is the lack of component characteristics at low speed. A method combining a stage-stacking method and testing data is developed to calculate the low-speed characteristics. The efficiency variation of combustion and heat conservation between gas and metal are considered for startup procedure. Modeling method which is adopted for normal speed above ideling is successfully applied to startup model. The comparison between simulation and testing data for a turbo-shaft engine indicates that this state-stacking method has reasonable precision in the evaluation of component characteristics, and the startup model developed can be used to study the fuel flow schedule and estimate the starting characteristics.

Key words: aero engine, startup process, stage-stacking method, mathematical model, testing data