HUANG Shuchao1,2,YUAN Wei1,2,HAN Le1,2.Investigation on Mechanisms of Stall Margin Improvement of Casing Treatment with Bridge Structure[J].航空发动机,2018,44(1):44-51
Investigation on Mechanisms of Stall Margin Improvement of Casing Treatment with Bridge Structure
DOI：
Key Words:compressor stall margin improvement  stall mechanism  casing treatment with bridge structure  injecting area  bleeding area  aeroengine
Author NameAffiliationE-mail
HUANG Shuchao1,2,YUAN Wei1,2,HAN Le1,2 1. National Key Laboratory of Science and Technology on Aero-Engine & Aero-Thermodynamics, Beihang University, Beijing 100191, China
2. Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China 		hscbuaa@163.com 
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Abstract: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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