• 제목/요약/키워드: Turbine boundary layer transition

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비정상후류가 선형터빈익렬의 유동 특성 및 익혀의 열전달에 미치는 영향에 관한 연구 (Influence of Unsteady Wake on Flow Characteristics and Heat Transfer from Linear Turbine Cascade)

  • 윤순현;심재경;이대희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부 B
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    • pp.713-716
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    • 1998
  • To examine the influence of unsteady wake on the flow and heat transfer characteristics, an experiment has been conducted in a four-vane linear cascade. Flow and heat transfer measurements are made for the inlet Reynolds number of 66000(based on chord length and free-stream velocity). Turbulent intensity and stress were measured using hot wire anemometer, and to measure the convective heat transfer coefficients on the blade surfaces liquid crystal/gold film Intrex technique was used. The disturbance by the unsteady wake is characterized by the unresolved unsteadiness. The unsteady wake enhances the turbulent motion of flow in the cascade passage. It also promotes the boundary layer development and transition. The results show that heat transfer coefficients on the suction surface increase with increasing unresolved unsteadiness.

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비정상후류가 선형터빈익렬의 유동 특성 및 익형의 열전달에 미치는영향에 관한 연구 (Influence of Unsteady Wake on Flow Characteristics and Heat Transfer from Linear Turbine Cascade)

  • 윤순현;심재경;이대희
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
    • /
    • pp.393-396
    • /
    • 1998
  • To examine the influence of unsteady wake on the flow and heat transfer characteristics, an experiment has been conducted in a four-vane linear cascade. Flow and heat transfer measurements are made for the inlet Reynolds number of 66000(based on chord length and free-stream velocity). Turbulent intensity and stress were measured using hot wire anemometer, and to measure the convective heat transfer coefficients on the blade surfaces liquid crystal/gold film Intrex technique was used. The disturbance by the unsteady wake is characterized by the unresolved unsteadiness. The unsteady wake enhances the turbulent motion of flow in the cascade passage. It also promotes the boundary layer development and transition. The results show that heat transfer coefficients on the suction surface increase with increasing unresolved unsteadiness.

  • PDF