Abstract:

The simulation of aircraft engine control system is one of the aircraft engine reliability engineering research.Because the engine in accelerating the process，must ensure that the engine does not surge，does not appear over-temperature，we analyze the accelerate process. The steady-state and dynamic models for a separate exhaust turbofan engine are presented by utilizing component characteristics. The use of the Matlab language and its libraries compile the Newton -Raphson algorithm based on the steady state，and steady -state simulation，obtain the relationship between a high-pressure speed，low speed，thrust and other performance parameters and fuel supply. Achieve the dynamic simulation of a turbofan engine using Matlab （Simulink）by researching Iterative method，give the performance in the case of accelerated oil change. Finally，by analyzing the surge margin of three different acceleration time，we draw the influence of different acceleration time to surge.

Key words: turbofan engine, acceleration process, numerical calculation, component characteristics