B-2 周方向溝型ケーシングトリートメントが遷音速圧縮機流れに及ぼす影響(空力,一般講演)

概要

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CFD analysis was carried out on two different transonic compressor rotors with circumferential single grooved casing treatment. The differences in flow field and stall inception mechanism among two rotors are presented with principal focus on tip leakage flow behavior, passage blockage, and vortical flow structures. The effect that the casing groove placed above the blade leading edge has on stall margin and flow phenomena is then studied. The interaction of the groove with the flow in the tip region was different between two rotors depending on the original flow structures. It was also found that whether the casing treatment showed positive enhancement on the compressor stability or not was not only dependant on the groove induced flow itself but also on its relationship with original stall inception mechanism.
2011-07-06