側壁境界層フェンスによるタービン翼列二次流れの最適抑制

概要

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An experiment was performed to reduce secondary flow and total pressure losses occurring in a linear turbine rotor cascade. Boundary layer fences were attached to channel-confining endwalls, and hot-wire and Kiel probe measurements were made downstream of the cascade for different heights and pitchwise locations of the fences. The optimum fences with the height 1/3 of the inlet boundary layer thickness and located half the endwall loss region, and secondary kinetic energy. They also reduce secondary and gross losses to 3/4 of an unfenced case. Higher fences diminish passage vortices close to the blade suction surfaces and fence vortices, but strengthen trailing vortex pairs generated by the fences. A critical fence height above which the horseshoe vortices are trapped is found, and the fences of minimum critical height agree with the optimum fences.
社団法人日本機械学会の論文
1988-12-25