多叶排旋转失速起始的研究

以小扰动理论为基础 ,应用非定常、二元、不可压流的流动模型 ,推导了任意级轴流压气机的旋转失速起始判别准则通式。通过三个矢量方程组 ,系统地归纳了小扰动理论应用于多排叶片时各待定系数的关联方程。利用所设计的计算机程序 ,完成了对多级轴流压气机旋转失速起始边界的理论估算。与叶排特性的预估方法相结合 ,提出了一种较完整的理论估算失速边界的方法。理论值和实验值的吻合 ,证实了理论分析的可靠性。对比计算结果 ,讨论了失速团数目和级间轴向间距这些待定参数对预估结果的影响

RESEARCH OF ONSET OF ROTATING STALL FOR MULTIPLE BLADE ROWS

An inception criterion of rotating stall in multistage axial flow compressors is derived for the unsteady,two dimensional and incompressible flow model according to the small disturbance stability theory.By means of a three vector equation system,the correlative equations of the undetermined parameters are thus deduced when the small disturbance theory is applied to multiple blade rows.The prediction of the rotating stall onset boundary in the multistage axial flow compressors has been accomplished with the computer program designed by the authors.A theoretical prediction approach is proposed with the aid of the prediction method of stable cascade characteristics.A good agreement between the analytical and experimental results indicates that the theoretical analysis is believable.As compared with the calculation results,the influences of the undetermined parameters,such as stall cells and axial distance between two stages,on the prediction values are discussed.