Improvement in Turbine Blade Aerodynamic Force in the Tip Region

概要

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An attempt to increase the turbine blade aerodynamic force was made by installing boundary layer fences on the endwalls of a linear turbine rotor cascade. The height and location of the fences were varied to optimize these parameters. Static pressures measured on the passage surface correlated well with surface secondary flow patterns visualized by the oil flow method. The fences favorably attenuated local unloadings in the tip region of the suction surface associated with the endwall crossflow and the passage vortex three-dimensional separation, but unfavorably inhibited a passage-vortex-induced local loading also on the suction surface. The fences were most effective when their height was one-third of the inlet endwall boundary layer thickness and located half a blade pitch away from the blades. The optimum fences then reduced the tangential force defect to 60 percent of the unfenced blading value.
一般社団法人日本機械学会の論文
1990-08-15