環状タービンノズル翼列のケーシングに設けた境界層フェンスの効果

概要

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This study aims at reducing secondary flow and associated losses in total pressure in axial-flow turbines. Boundary layer fences were attached to the casing wall of an annular nozzle cascade. Hot-wire and pneumatic measurements were carried out downstream of the cascade for 7 different protruding heights of the fences. The optimum height of the fences was approximately 1/4 of the inlet boundary layer thickness. The optimum fences reduced the passage-mass-averaged loss by 14 percent from the unfenced blading value. This reduction resulted from local loss reductions within and near the blade wake, which compensated for the installation of the fences. The maximum underturning, induced by the secondary vortices, was markedly attenuated with the use of optimum fences.
社団法人日本機械学会の論文
1994-01-25