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In this paper, casing treatment with a bridge structure is numerically investigated to study the mechanism of stall margin improvement. The results show that both the tip leakage flow and separation flow on the suction side of the blade can block the rotor tip passage and thereby lead to stall. Tip leakage flow is the main reason for stall in a compressor with a smooth shroud. Bridge casing treatment can control both the tip leakage flow and separation flow to balance stall margin improvement and efficiency loss by varying the suction area and the jet area. The results show that the enlargement of the jet area increases the attack angle; consequently, the separation flow increases on the suction side whereas the efficiency decreases. Moreover, it is observed that tip leakage decreases and stall margin increases with an increase in the jet suction area.

An Investigation of the Mechanisms of Stall Margin Improvement in Casing Treatment with Bridge Structure