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在压气系统中,压力上升和空气扰动之间总是有一定的时间滞后.本文对经典的MG模型进行推广得到时滞MG模型本.通过理论分析和数值模拟,研究了时滞对轴流压气机喘振和旋转失速的影响.以往的研究认为旋转失速的产生仅受到节流阀参数的影响,而喘振工况的出现要受到节流阀参数以及Greitzer参数B的影响,Greitzer参数B大于临界值时,压气机进入到喘振工况.本文研究发现时滞也会对喘振现象产生本质的影响,即存在着临界时滞,当时滞小于临界时滞时,压气机的不稳定工作形式是大振幅的喘振状态,而时滞大于临界时滞,压气机工作在旋转失速状态.
In the compression system, there is always a time lag between the pressure rise and the air disturbance.This paper extends the classical MG model to obtain the MG model with time-delay.Through theoretical analysis and numerical simulation, Machine surge and spin-off stalls.The past research shows that the occurrence of spin-stall is only affected by the throttle parameter, and the occurrence of surge condition is affected by the throttle valve parameters and the Greitzer parameter B, Greitzer parameter B is greater than When the critical value, the compressor enters the surge condition. In this paper, it is found that the time lag will also have an essential effect on the surge phenomenon, that is, there is a critical time lag. When the time lag is less than the critical time lag, the unstable operation of the compressor The form is a large amplitude surge state, and the time lag is greater than the critical time lag, the compressor working in a spinning stall state.