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当压缩系统的工作点到达不稳定边界时,会产生旋转失速。但究竟在系统中仅仅是旋转失速或是进一步引起喘振,这在理论上和实际问题中都是值得研究的课题。Greitzer建立了一个非线性模型,以描述压缩系统的气动力学,从而提出了判别压缩系统喘振/旋转失速的一个无因次参数,叫B参数,(其中U为叶片的圆周线速度,a为音速,V_p为气压室容积,A_c和L_c为压气机的当量面积和当量长度)。当系统的B值大于某一临界B值(B_(cr))时,系统会发生喘振;否则系统仅产生旋转失速。
When the operating point of the compression system reaches an unstable boundary, a rotational stall occurs. However, whether the system is only rotating stall or further cause surge, which in both theoretical and practical issues are worthy of study. Greitzer established a non-linear model to describe the aerodynamics of the compression system, thus proposing a dimensionless parameter to determine the compression / rotation stall of the compression system, called the B-parameter (where U is the circumferential speed of the blade, a is Velocity of sound, Vp for the pressure chamber volume, A_c and L_c for the compressor equivalent area and equivalent length). When the system’s B value is greater than a critical B value (B cr), the system will surge; otherwise, the system will only produce a rotational stall.