低レイノルズ数領域において翼型特性に及ぼす主流乱れの影響 : 乱流格子による実験

概要

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The Agency of Industrial Science and Technology, Ministry of International Trade and Industry has been researching and developing three types of 300kW ceramic gas turbines since 1988. The turbine blade's Reynolds numbers based on the basic design are predicted to be in the region of l0^4〜10^5. In the field of wind turbines, for example, some studies on the characteristics of airfoils at low Reynolds numbers have been carried out. However, it is not yet obvious how the turbulence affects the characteristics of airfoils. This paper describes the experimental results obtained with use of turbulence screens. It is found that laminar seperated flows, in some cases, reattaches to airfoils by raising turbulence intensity of free stream at Reynolds numbers of 0.5×10^5 and 1×10^5, and that lift to drag ratios increase further.
1993-11-25