Modeling of whole processes of mixing exhaust afterburner twin spool turbofan engine

Firstly, a steady state mathematical model was developed for the mixing exhaust afterburner twin spool turbofan engine in full envelope. Secondly, a startup dynamic model was constructed by combining the effects of volume dynamics with the steady model. Then, by extending the volume dynamics theory to idle state, a whole process model was obtained to calculate the startup process, acceleration and deceleration process, turn on/off afterburner process and stop process. Finally, the altitude characteristic was presented with the proposed regulation law in full envelope of the engine; the whole processes from startup to stop were simulated with the designed control algorithm. The results show that the model is able to simulate the steady and dynamic states in full envelope, and correctly describes the whole process of mixing exhaust after burner twin spool turbofan engine including afterburning.