| Turbo-shaft engine is a complex aerothermodynamics system. Using established full range mathematical model to simulate full range working process of turbo-shaft engine can greatly reduce the cost of engine test and shorten the development cycle. Using established component evaluating model to evaluate actual efficiency of each component based on limited test data can provide technical support for performance improvement of the whole engine and components.In this paper, the component-level model of an advanced high power-weight ratio turbo-shaft engine was built firstly, and steady-state and transient-state working process was simulated by this model. Then, after acquiring low speed characteristics of rotate components, designing fuel supplying law in startup process and modifying burning efficiency, the startup model was built. Ground starting process in a variety of harsh environmental conditions and air starting process could be simulated by this model.Construction features and working principle of switched reluctance motor(SRM) were studied. Some common control modes and speed-torque features of SRM were explored. Application feasibilities and technical solutions of SRM in turbo-shaft engine starting control were also explored and the combines of constant torque and constant power working characteristics of SRM speed controlling were designed.Considering that the engine performance of a certain type of turbo-shaft engine didn’t reach its designed target in whole engine test, the component evaluating model was built in this paper. The model could estimate values of parameters that could not be tested, and evaluate actual efficiency of some components. When evaluating actual efficiency of gas turbine and power turbine, pressure ratios of turbines which were unknown key parameters were calculated by means of a semi-component-level model of this turbo-shaft engine. Finally, the validity of this model was proved by using real test data. |
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