压气机二次流及其控制
STUDY ON THE SECONDARY FLOW AND IT′S CONTROL IN COMPRESSOR
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摘要: 本文是压气机二次流研究的总结。文中概述了压气机端壁角区流动,二次流与叶片颤振,二次流控制等问题的研究结果,这对于了解压气机真实流动和建立新的物理模型提供了一些重要信息,对于工程应用亦有一定价值。Abstract: The present paper is a final report of the study on the secondary flow in compressors.A systematic experimental investigations on the secondary flow of both the C4 and BC-6 airfoil cascades have been completed.A end-wall corner flow model has been provided.The C4 airfoil variations of the outlet angle along the blade height have been calculated by the secondary flow theory.They approach to the experimental results.The influence of the tip clearance on the blade stall flutter is also investigated in the flutter experiment of the BF-1 compressor rotor.An experimental study on the reduction of secondary flow is carried out by using both “Heading Edge Sweep” and “End Bending” techniques.The total pressure loss coefficients of these two cascades decrease significantly.The results of the whole compressor flow field calculation of the compressor “End Bending” cascades are in good agreement with the experimental data.Some important conclusions are drawn to reveal the real flow mechanisin in the compressor and to develop new compressor flow physical models.It is of great value for engeerning application of the secondary flow control.
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