Effects of Profiled End Wall and Boundary Layer Suction Coupled Flow Control on Compressor Cascade Performance

To improve the performance of axial flow compressors and suppress the corner separation，profiled end wall （PEW）and boundary layer suction（BLS）are combined to explore the influence of two control methods on the aerodynamic performance of high-load compressor cascades at different conditions by using numerical simulation. Neural network is used as surrogate models and multi-objective genetic algorithm is used for global optimization. Five optimum end wall cases are combined with three kinds of suction slots in different chord length positions. The results show that taking into account the aerodynamic performance of the cascade in design condition and near-stall condition，the combination of suction slot at the 70% chord length of the suction side and the concave front and middle part of the passage，and the convex shape near the pressure surface are optimal. At the design condition，the boundary layer suction suppressed the generation of transition bubbles in the middle of the chord length，and effectively reduced the wake loss. At this time，the optimal combination reduces the total pressure loss by 12.7%. At the near stall condition，the profiled end wall method can effectively control the end wall secondary flow，improve the passage blockage，suppress the corner separation and reduce the wake loss. At this time，the optimal combination reduces the total pressure loss by 15.5%. © 2023 Journal of Propulsion Technology. All rights reserved.