摘要
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.
Time delay always exits between pressure rising and air disturbance in a compression system. A classical MG model is extended to propose a delayed MG model. Both analytical method and numerical simulation are employed to investigate the effect of the time delay, an important physical parameter, on axial compressor surge and rotating stall. Previous studies perform that the rotating stall is only produced by throttle valve and the surge by both throttle valve and Greitzer parameter. The present paper reveals that the delay is an important factor and it may also lead the qualitative change of the surge, namely, there exists a critical delay so that the compression system performs the surge with a large amplitude when value of the delay is less than the critical delay, and the compression system works in rotating stall when value of the delay is greater than the critical delay.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2013年第4期380-389,共10页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金重点项目(批准号:11032009)
上海市重点学科资助项目(编号:B302)
