Simplified compound suction schemes of an aspirated highly loaded compressor cascade

Abstract

Active flow control should be adopted at more than one critical position in highly loaded aspirated compressors due to the severe flow separation and obvious three-dimensional characteristics of the flow field. A deep insight into the mechanism of the simplified compound boundary layer suction in a highly loaded compressor cascade was experimentally and numerically revealed in this paper. Locations of the two suction slots in the studied compound suction schemes were determined through previous experimental investigations on the single-slot suction schemes. Base on the one-side suction manner and the shared suction recycle system, the suction flow distribution over the suction surface slot (SS4) presented to be C-type along the spanwise both in single-slot cases and the compound suction schemes. On the other hand, the flow distribution over the endwall slot (EW1) was no longer that even along the axial direction after it cooperates with the SS4 slot, especially under the small total suction flow rate. The studied compound suction scheme owns obvious advantages in improving aerodynamic performance of the compressor cascade, when the total suction flow rate is big enough for both slots. About one-sixth loss reduction was achieved in the compound suction scheme with 1.5% suction flow rate. Therefore, the simplification of suction equipment via sharing one set of suction system and employing one-side suction manner is proved to be feasible and as effective in the studied multi-slot suction schemes.

Keywords

Axial compressors flow control boundary layer suction compound suction scheme suction flow distribution

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