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1報:レイノルズ数の低下

概要

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Tip clearance losses represent a major efficiency penalty in turbine blades. This two-part paper describes the effect of tip clearance on the aerodynamic characteristics of a turbine cascade under very low Reynolds number conditions, Re_<out>=4.4×10^4〜26.6×10^4. The free-stream turbulence intensity was 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 1 of the paper investigates the effect of decreased Reynolds number on the loss and the three-dimensional flow field. Although the three-dimensional flow was strongly affected by the Reynolds number, the tip clearance loss remained almost constant at a range of Reynolds numbers. Exit flow angle, however, gradually decreased with falling Reynolds number.
2004-07-20