Influence of Groove Type Casing Treatment on Behavior of Tip Leakage Flow in Linear Compressor Cascade

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Other Title
  • Groove型ケーシングトリートメントが圧縮機直線翼列内の翼端漏れ流れの挙動に及ぼす影響
  • Groove型ケーシングトリートメントが圧縮機直線翼列内の翼端漏れ流れの挙動に及ぼす影響 : ミットコードに設けた単一Grooveの影響
  • Grooveガタ ケーシングトリートメント ガ アッシュクキ チョクセンヨクレツ ナイ ノ ヨク ハシモレ ナガレ ノ キョドウ ニ オヨボス エイキョウ : ミットコード ニ モウケタ タンイツ Groove ノ エイキョウ
  • (Influence of Single Groove at Mid-chord)
  • (ミッドコードに設けた単－Grooveの影響)

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Description

<p>In order to maximize the improvement effect on axial compressor aerodynamic performance by the circumferential groove casing treatment (CGCT), it is necessary to clarify its influences on the flow behavior which reduces the stable operating flow range. In this study, as a first step to study the CGCT, flows in a linear compressor cascade with and without a groove installed at mid-chord were analyzed numerically. The computed results clarified the following phenomena. The groove reduces a distance between a tip leakage vortex (TLV) and a blade suction surface by a decrease of blade loading around the groove and a flowing of flow near the blade pressure surface into the groove. The groove reduces a loss due to the TLV, but a loss generation in the entire cascade passage is almost the same as that in the smooth endwall case because of an additional loss generation by the groove.</p>

Journal

  • Turbomachinery

    Turbomachinery 48 (6), 337-344, 2020

    Turbomachinery Society of Japan

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