412 An Experimental Study on the Aspect-Ratio Effect of a Cross-Flow Impeller

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  • 412 貫流羽根車のアスペクト比効果に関する実験研究(新エネルギー(1),環境保全型エネルギー技術)

Abstract

The purpose of this experimental research is to reveal the aspect-ratio effect on the flow around and inside a cross-flow impeller. In order to eliminate the complicated casing factors that influence their performances, the impeller rotates in open space without any casings. As a result, by using hot-wire-velocimetry (HWV) measurements and by conventional flow visualizations, the authors divide the flow around the impeller into three areas, and observe the eccentric-vortex revolution inside the impeller. Using a particle-image-velocimetry (PIV) technique, the authors quantitatively show velocity distributions, whose accuracy is checked in comparison with HWV results. In addition, the authors define outflow rate Qo from the impeller, and show that the aspect ratio effect on the outflow-rate coefficient C_<Qo> is not negligible at aspect ratios less than one.

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