後流の影響を受ける非定常平板境界層に関する研究 : (特にレイノルズ数の効果について)

概要

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Experimental and theoretical studies are made on the unsteady boundary layer on a flat plate which is subjected to periodic wake from upstream moving cylinders. The purpose of this paper is to develop a unified approach t.o incorporate the wake-induced unsteady effect in the design process of turbine blade cooling. Firstly, theoretical attempt is made to define a wake profile in terms of its turbulence inten-sity. Secondly, the way of estimation of wake duration and forced transition point, which are important factors in the forced transition model of the boundary layer under zero pressure gra-dient, is presented. Then, the deduced approach is applied with success to the prediction of surface Stanton number distribution around an actual turbine blade. In the experiment, time-averaged heat transfer characteristics over the plate are measured for several cases of differ-ent Reynolds number conditions to examine the Reynolds number effect, then to check the validity of the forced transition model.
公益社団法人日本ガスタービン学会の論文
1993-03-10