关键词: 航空发动机;非性线系统;控制仿真;控制理论;实时仿真

Abstract: Gas domain dynamics method is found most suitable for the simulation of nonlinear transient process of aero-engine. In this method, a serials of ordinary differential equations which describe the working process of main combustor, bypass duct and afterburner are established and simplified. Time marching method is used to solve steady state, and explicit Euler method is used to calculate the transient process. The gas domain dynamics method is further developed. For the transient process, implicit scheme was employed to ensure convergence and to diminish the artificial vibration generated by second order difference scheme. A dual time step method was introduced to simplify the process of implicit calculation, as well as to shorten the time needed for solution in one time step. Simulation tests showed this new method was good in accuracy and robust. It can be used in real time simulation of aero-engine working at nonlinear high excursion condition.

Key words: Aircraft engine;Nonlinear system;Control simulation;Control theory;Real time simulation