遠心ポンプ羽根車流路内の圧力変動 : 入口旋回流の影響

概要

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Effects of an inlet swirl on pump performance and static pressure were investigated experimentally. When a swirling flow was introduced to a centrifugal pump, the pump head was increased/decreased depending on the direction of the inlet swirl, and efficiency deteriorated because of the increase in the hydraulic loss at he impeller inlet. The instantaneous pressures on the blade surface were measured by transducers mounted on the impeller, and the rapid change of static pressure caused by the interaction of the vortex core and the impeller blades was clarified. The static pressure change was found to be dominant near the leading edge of the blade, but decreased along the blade. Introducing a small quantity of air into the vortex core made it possible to visualize the behavior of the vortex core at the inlet of the impeller passages ; it was found that the behavior of the vortex core was quite different with the direction of the swirl.
一般社団法人日本機械学会の論文
1989-10-25