Aspect-Ratio and Reynolds-number Effect On Cross-Flow Impellers(Fluid Machinery)
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概要
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The purpose of this experimental research is to investigate both the aspect-ratio effect and the Reynolds-number effect, especially for the flow of impellers with short axes. Particle-image-velocimetry (PIV) technique and a hot-wire anemometer are used for measurements of flow velocity. The impeller rotates in open space without any casings. The authors have studied two kinds of the impeller, that is with forward-curved blades and with flat-plate blades. As a result, the following were obtained. Observing eccentric vortex revolution using hot-wire measurements and flow visualization, we classified the flow into three modes. And according to this classification, we showed stability diagrams for both impellers. Using PIV results, we defined outflow rate Q from impeller. Outflow rate coefficient C_Q is independent of Re for both impellers. For a flat-blade-impeller, C_Q is not affected by aspect ratio L/D_2. But, for a forward-curved-impeller, C_Q increases with L/D_2.
- 社団法人日本機械学会の論文
- 2005-10-05
著者
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FUNAKI Jiro
Department of Mechanical Engineering, Doshisha University
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HIRATA Katsuya
Department of Mechanical Engineering, Doshisha University
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Hirata Katsuya
Department Of Mechanical Engineering Doshisha University
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Funaki Jiro
Department Of Mechanical Engineering Doshisha University
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HISADA Motohide
Department of Mechanical Engineering, Doshisha University
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Hisada Motohide
Department Of Mechanical Engineering Doshisha University
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