【摘要】 周向开槽机匣处理用于一个亚音单级轴流压气机的孤立转子上,并进行了它的总性能基元性能和失稳后的动态性能实验。对实验结果作了评定和分析。进一步阐明了周向槽机匣处理改进失速裕度的原因。更多还原

【Abstract】 The circumferentially grooved casing treatment （CGCT）, which is used for extending stable operation region of compressor, has advantages of no reduc- tion in efficiency and simplifying the construction of casing. Many inves- tigators have done both theoretical and experimental research on CGCT [1, 2, 3, 4]. But the design of such casings still depends largely on experience, and further exploratory research is much needed. In this paper, the authors offer the three following observations with a view to contributing a little to the rational explanation of observed effects: （1） Experimental evaluation of the overall performance of the rotor shows that the CGCT for subsonic rotor can alse be designed by empirical rules already found applicable to CGCT of transonic rotor. （2） It is found that the effects of CGCT are: flow changes are limited to a small part of flow near the blade tip; the load on the element blades is increased and blade row allows the pessage of a larger amount of flow rate per unit cross-section. The increase in flow rate is an important factor for restraining the rotating stall inception and improving the stall margin. This paper correlates experimental data with the following area-ratio parameter: A=π_r/(（T₂/T₁）^K/（K-1）) (q(λ_w2))/(q(λ_w1)) Such a correlation shows that the concept of blockage area-ratio of two-di- mensional cascade to explain effectiveness of the CGCT at the tip is still valid. （3） Comparison of the transient traces shows that the effect of casing treatment may alter the unstable mode of flow,tending to decrease the energy in osillatory flow.更多还原