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为了解决传统处理机匣对压气机“扩稳降效”的现象,打破处理机匣结构的轴对称传统,并设计了5种不同周向分布范围的非轴对称处理机匣.实验结果显示压气机的稳定裕度随非轴对称处理机匣的周向处理槽数的增多而单调增加,而效率则随处理槽数的增多先增加后减小.当非轴对称处理机匣的周向处理范围为120°时,能使压气机的稳定裕度和效率均有所增加,起到“扩稳增效”的效果.初步分析其原因是非轴对称的机匣结构改变了压气机叶尖的非定常流动.
In order to solve the traditional treatment of the compressor “expansion and reduction of efficiency” phenomenon, to break the traditional axial symmetry processing casing structure, and the design of the five different circumferential distribution of non-axisymmetric casing .Experimental results Shows that the stability margin of the compressor increases monotonically with the increase of the number of circumferential processing slots of the non-axisymmetric casing, while the efficiency increases and then decreases with the increase of the number of slots. When the non-axisymmetric casing To the treatment range of 120 °, the compressor can increase the stability margin and efficiency, play the effect of “expansion and efficiency.” The preliminary analysis of the reason is that the non-axisymmetric casing structure changes the pressure Unsteady flow of machine tip.