Unsteady effect on casing treatment in counter-rotating axial flow compressor

被引：0
|
作者：
Guo Y. [1 ,2 ]
Gao L. [1 ,2 ]
Mao X. [1 ,2 ]
Wang L. [1 ,2 ]
机构：
[1] School of Power and Energy, Northwestern Polytechnical University, Xi’an
[2] The National Key Laboratory of Aerodynamic Design and Research, Northwestern Polytechnical University, Xi’an
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2023年 / 38卷 / 03期
关键词：
axial slot casing treatment; counter-rotating axial flow compressor; self-recirculating casing treatment; stability enhancement mechanism; unsteady;
D O I：
10.13224/j.cnki.jasp.20210508
中图分类号：
学科分类号：
摘要：
In order to reveal the difference between the stability enhancement mechanism and the loss of different forms of casing treatment, a two-stage counter-rotating axial flow compressor (CRAC) was taken as the research object, the stability enhancement mechanism of self-recirculating casing treatment (SRCT) and axial slot casing treatment (ASCT) was studied by unsteady numerical simulations. The results showed that both SRCT and ASCT significantly improved the stall margin and total pressure ratio at the near-stall point, and increased the efficiency loss at the peak efficiency point. The casing treatment reduced the dynamic-dynamic interference effect between the two rotors by acting on the tip leakage flow and suppressing the pressure potential flow. The flow in axial slots was related to the relative position of the rotor. The periodic sweeping of the rotor to the casing treatment slots increased the unsteadiness of flow in casing treatment slots, and the mixing of the flow in casing treatment slots was the main reason for the decrease of efficiency. © 2023 BUAA Press. All rights reserved.
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页码：685 / 697
页数：12
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