Research On Full Range Modeling Technology For Aero-engines

It is no doubt that the full range simulation program of aero-engine is very important for the semi-physical simulation experiments. To provide the basis for the design of the engine control system, It is a very urgent need to establish an uncomplicated full range dynamic mathematical model with sufficient precision and achieve the efficient and real-time simulation of aero-engine performance.In this paper, an above-idle component-level model for certain type of twin-spool mixing flow turbofan engine with afterburner is developed. The impact of the humidity, the thermal inertia model of high temperature component to the engine performance is analyzed. Extension method of the engine component characteristics at low rotor speed is researched. Based on analyzing the key technologies of the engine's component-level startup model, the turbofan engine startup model is developed. Using the fan (compressor) characteristic diagrams at full-open,full-closed and rated guide vane angles, the fan (compressor) model under continuous changes of the guide vane angle is established. Based on the analysis of control mechanics of thrust-vectoring nozzle, the kinematic and dynamic models of thrust-vectoring nozzle are established with simplified methods. By integrating all of the above models, a full range component-level dynamic model of a certain type of turbofan engine is established eventually.The digital simulation of the model is also performed in this paper, including the steady-state simulation and dynamic simulation. The simulation includes high-altitude starting and the ground starting in different environments such as high/low temperature or plateau. The acceleration and deceleration process in above-idle process and afterburning process are also simulated. The effects of the adjustable guide vanes and the thrust-vectoring nozzle to the engine are analyzed.