| 黄书超1,2，袁巍1,2，韩乐1,2.桥式槽处理机匣的扩稳机理研究[J].航空发动机,2018,44(1):44-51 |
| 桥式槽处理机匣的扩稳机理研究 |
| Investigation on Mechanisms of Stall Margin Improvement of Casing Treatment with Bridge Structure |
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| DOI： |
| 中文关键词: 压气机扩稳 失速机制 桥式处理机匣 喷气区 抽吸区 航空发动机 |
| 英文关键词:compressor stall margin improvement stall mechanism casing treatment with bridge structure injecting area bleeding
area aeroengine |
| 基金项目:北京航空航天大学科研基金（YWF-15-GJSYS-018）资助 |
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| 中文摘要: |
| 利用数值模拟的手段对桥式槽处理机匣的失速机制和扩稳机理进行研究。通过与实壁机匣和全通槽处理机匣的对比分
析结果表明：叶尖泄漏和叶片吸力面的分离均会引起叶尖通道堵塞，进而诱发失速。在实壁机匣情况下叶尖泄漏流堵塞叶尖通道是
诱发失速的主要原因；全通槽和桥式槽处理机匣均能减弱叶尖泄漏流强度，但是全通槽处理机匣加剧了吸力面的分离，这造成了较
大的效率损失；而桥式槽处理机匣能够通过改变抽吸区和喷气区的面积大小控制泄漏流和分离流引发的流道堵塞，从而在裕度提
升和效率损失之间取得平衡。研究表明：喷气区面积越大，叶尖攻角越大，吸力面分离越强，压气机效率越低；抽吸区面积越大，泄漏
流越弱，压气机的失速裕度越大 |
| 英文摘要: |
| Numerical investigation was performed on the casing treatment with bridge structure to explore the mechanism of stall and
margin improvement. The results show that both of the tip leakage flow and the separation flow on suction side of blade can block the rotor
tip passage which will lead to stall. The tip leakage flow is the mean reason of stall in compressor with smooth shroud. Both of arc skewed
slot and bridge casing treatment can reduce the strength of tip leakage flow. But arc skewed slot enhances the separation flow on suction
side which lead to heavy efficiency loss. Bridge casing treatment can balance the margin improvement and efficiency loss by restrict both
the tip leakage flow and the separation flow by changing bleeding area and injecting area. The enlargement of the injecting area will magnify
the attack angle and enhance the separation flow on suction side and the efficiency loss. The bigger the bleeding area is, the better the tip
leakage meliorated and the more the stall margin improved |
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