加力式双转子混合排气涡扇发动机全状态数学建模技术

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

根据部件法建立了加力式双转子混合排气涡扇发动机全包线稳态数学模型.基于该模型,利用容积动力学原理,建立了起动数学模型.将该原理扩展到慢车状态以上,建立了包括起动、加减速、开关加力、停车等完整过程的全状态动态数学模型.以此为基础,给出了加力式双转子混合排气涡扇发动机在飞行包线内的高度特性.根据加力式双转子混合排气涡扇发动机原理,设计了简单的起动调节规律、加减速调节规律、加力调节规律及停车调节规律;计算了海平面标准大气条件下的从起动、加减速、开关加力、停车的完整动态过程.理论分析与仿真结果表明:该建模方法能够正确完成加力式双转子混合排气涡扇发动机的全包线的稳态计算和全状态动态计算,准确反映了该发动机在整个飞行包线内的全部工作过程.

Firstly, a steady state mathematical model was developed for the mixing ex haust 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 ob tained to calculate the startup process, acceleration and deceleration process, turn on/off af terburner 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.