轴流压缩系统中主动抑制旋转失速的数值模拟

提出一个可用于分析轴流压缩系统通过附加扰动主动抑制旋转失速的理论模型,利用该模型讨论了系统参数对抑制效果的影响及旋转失速和喘振之间的关系.结果表明该方法的抑制效果随着B参数及压气机级数、级负载的增加而降低;同一压缩系统发生一维喘振的工作点轴向速度系数由B参数及压气机轴对称特性共同决定,与特性线斜率无关;并且只有当喘振由旋转失速引起时,才可以通过抑制旋转失速来防止喘振的发生.

Numerical simulation of active suppression of rotating stall in axial compression systems

In the present paper, a theoretical model is proposed to analyze the transient behavior of suppression of rotating stall in axial compression systems through the use of an additional disturbance. The influences of system parameters on the suppression effectiveness and the interaction between rotating stall and surge have been discussed. The analysis of the influence of system parameters presents that both the B parameter and axisymmetric compressor characteristic have significant effect on the stabilization effectiveness of a control strategy. The effectiveness decreases as the value of B and the number of stages or stage loading of the com-pressor increase. It has been found that the onset flow rate of rotating stall and surge in a compression system may be different, and there is a strong interaction between these two kinds of instabilities. The onset flow rate of pure one dimensional surge depends on the value of B and axisymmetric compressor characteristic, besides the slope of the compressor characteristic. In some cases, when rotating stall which is the natural mode of in-stability in a compression system is suppressed, one dimensional surge can occur. It often limits the effective-ness of a control strategy to suppress rotating stall. But when surge is initiated by rotating stall, it is also possi-ble to inhibit the occurrence of surge by suppressing rotating stall in a compression system.