側壁境界層フェンス付タービン翼列の二次流れと損失 : フェンス取付位置の影響

概要

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Boundary layer fences have been attached to channel-confining endwalls of a linear turbine rotor cascade to reduce secondary flow and losses. Local and averaged secondary flow propeties obtained from hot-wire and Kiel probe measurements downstream of the cascade are shown for the different pitchwise locations of fences. The fences are most effective if located half the pitch away from the blades. The optimum fences reduce the secondary vorticities by half, the enbwall distances of these vortices by 30%, and the maximum underturning by 60%, compared with an unfenced blading case. They decrease the secondary loss by 22%, the net loss produced within the cascade by 10%, and the gross loss including secondary kinetic energy dissipation far downstream by 25%, in spite of an additional loss production due to friction and flow separation at the fences.
社団法人日本機械学会の論文
1988-09-25