Flow Mechanism for Stall Margin Improvement via Axial Slot Casing Treatment on a Transonic Axial Compressor
Publish place: Journal of Applied Fluid Mechanics، Vol: 10، Issue: 2
Publish Year: 1396
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JAFM-10-2_021
تاریخ نمایه سازی: 3 بهمن 1400
Abstract:
Axial slot CTs were designed and applied on Rotor ۶۷ to understand the physical mechanisms responsible for the improvement of the stall margin. Unsteady Reynolds-averaged Navier-Stokes was applied in addition to steady Reynolds-averaged Navier-Stokes to simulate the flow field of the rotor. The results show that aerodynamic performance and the rotor stability were improved. Stall margin improvement (SMI) improved by ۲۶.۸۵% after the CT covering ۵۰% of the axial tip chord was applied, whereas peak efficiency (PE) decreased the least. The main reason for the rotor stall in the solid casing is the blockage caused by tip leakage flow. After axial slot CTs were applied, the tip leakage flow in the front part of the chord was obviously reduced, and the majority of the blockages in the tip region were removed. The absolute value of the axial momentum before ۴۵% axial chord in CT_۵۰ was reduced by ۵۰%, whereas the maximum tangential momentum value of CT_۵۰ was decreased by ۷۰% relative to the solid casing. CT_۵۰ configuration was located across the shock wave; thus, it can fully utilize the pressure gradient to bleed and remove the blockage region, and the across flow is considerably depressed.
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Authors
H. Kuang
School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shanxi, ۷۱۰۱۲۹, China
S. Wuli Chu
School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shanxi, ۷۱۰۱۲۹, China
H. Zhang
School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shanxi, ۷۱۰۱۲۹, China
S. Ma
School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shanxi, ۷۱۰۱۲۹, China