タービン翼列の損失と三次元流れへ及ぼすチップクリアランスの影響 : 第2報:主流乱れ度の増加

概要

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The loss of performance due to tip clearance flow has been intensively studied for many years. This two-part paper describes the effect of tip clearance on the aerodynamics of a turbine cascade under conditions of very low Reynolds number: Re_<out>=4.4×10^4〜26.6×10^4. The free-stream turbulence intensity varied between 0.5% and 4.1%. Three-dimensional flow fields at the exit of the turbine cascade were measured using a five-hole pressure probe for both "with tip clearance" and "without tip clearance" cases. Part 2 of the paper investigates the effect on the loss and three-dimensional flow field of increased free-stream turbulence intensity. The tip clearance flow at high turbulence intensity had a smaller effect than that at low turbulence intensity. The tip clearance loss remained nearly constant at the various free-stream turbulence intensities. The reduction of exit flow angle at low Reynolds numbers was slightly improved when the free-stream turbulence intensity was increased.
2004-07-20