多级轴流压气机端壁边界层中叶片力亏损的研究

本文基于对有经向间隙和无任向间隙两种情况下叶栅二次流造成边界层内叶片力的偏转的分析建立了计算叶片力亏损的模型。文中给出了由瑞壁边界层叶片力亏损计算压气机效率的方法。用上述方法对两台轮流压气机和一个进口导向叶片排计算了端壁边界层厚度,得到了环面堵塞系数,计算了一台压气机的效率。对计算结果的分析表明,用这种方法可见得到较合理的计算结果。 

INVESTIGATION ON BLADE FORCE DEFECT IN END WALL BOUNDARY LAYER FOR MULTISTAGE AXIAL COMPRESSOR

In order to predict the blade force defect a new model is proposed which is based on the analysis of the deflection of the blade force in boundary layer due to the secondary flows in cascade both with and without tip clearance. It is assumedthat the scalar product of blade force defect and mainstream velocity is proportionalto the work done by the cascade secondary flow drag and can be expressedas equation(16) in the present paper. This equation approaches to the relationsuggested by Mellor et al. as the lift coefficient value of the blade is very low. A method using the values of blade force defect in boundary layer is pre- sented to estimate the compressor efficiency. The end wall boundary layer thicknessesare calculated and the blockage in meridional plane is obtained for two axial compressors and an inlet guide vane. The efficiency of a compressor is also estimated. The analysis indicates that reasonable results can be obtained by the use of this method.