多级轴流压气机稳定性的数字模拟

 本文基于有关试验的结果采用了一个“激盘-滞后-容积”模型作为压气机级的物理模型,以代替近年来常用的“激盘-集聚容积”模型。为了比较,在数字机上分别用这两种模型预算了一台多级轴流压气机的失速线。模拟的证实除了和部件试验结果比较外,还专门在发动机试验台上作了逼喘试验。结果表明,用新模型得出的失速线和全台试验得出的几个失速点很接近,而用旧模型预算的失速线恰位于部件失速线的右下方。这种过早预示工作不稳定的情况,在前人所作的稳定性模拟中也可以发现,这表明新模型改进了模拟效果。 在模拟稳定性的同时,也模拟了非设计工况下级间的相互匹配,所得的等转速线和试验数据也较符合。

THE DIGITAL SIMULATION OF STABILITY FOR MULTI-STAGE AXIAL COMPRESSOR

The actuator-lag-volume"is adopted as a physical model for stage of compressor instead of "actuator-lumped volume" model used by other authors in recent years. For comparison the stall lines of a multi-stage axial flow com-pressor have been predicted with these two models respectively . In addition to comparing the simulation with experimental results of compressor rig, the experiments on forcing the engine into stall have been conducted to verify the simulation. It is obvious that the stall line obtained from the new model is in better agreement with the stall points from engine test,but the stall line predicted with the old model is located at the right side below the stall line of compressor rig. The appearence of unstability prior to the real stall points can be also found in the simulation results of other authors. This shows that the new model improves the simulation.When simulating the stability,the stage's mutual matching under off-design conditions is also in good agreement with experimental lines.