• Title/Summary/Keyword: 누수접선방향속도

Search Result 1, Processing Time 0.015 seconds

Effects of the Leakage Tangential Velocity on the Leakage Flow Path in Shrouded Axial Compressor Cascades (축류압축기 슈라우드 캐비티내의 누수유동 경로에 대한 연구)

  • Sohn, Dae-Woong;Kim, Tong-Beum;Song, Seung-Jin
    • 유체기계공업학회:학술대회논문집
    • /
    • 2005.12a
    • /
    • pp.311-317
    • /
    • 2005
  • Measurements of the leakage flow in the shrouded cavity were performed in axial compressor cascades at $Re=2.6{\times}10^5$. This paper describes the effects of the leakage flow tangential velocity on kinematics of the leakage flow in the shrouded cavity and consequent overall loss and exit flow turning at stator blade row downstream. Flow data and flow visualization images consistently indicate that leakage flow circumferentially migrates 2, 4 and 5 blade passages in the direction of rotation for ${\upsilon}_y/c=0.09$, 0.35 and 0.45, respectively where ${\upsilon}_y$ is the leakage tangential velocity and c is the mainstream velocity. The leakage flow contracts to a jet across the seal-tooth resulting in an increase in the leakage axial velocity-doubling the leakage axial velocity in upstream cavity compared to that in the downstream cavity. Consequently, two flow regions are distinguished before and after the seal-tooth. As increasing the leakage tangential velocity, the overall loss downstream of stator blade row decreases and the exit flow turning in the range of span. from the hub endwall to 15% increases while the decreases in the flow turning from 15% to 30% span is observed.

  • PDF