1101 貫流羽根車のアスペクト比効果について(OS11-1 流体機械の諸問題,オーガナイズドセッション)

概要

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The purpose of this experimental research is to reveal the effect of aspect ratio AR upon the flow around and inside a cross-flow impeller, over a wide parameter range of AR. In order to eliminate the complicated casing factors that can 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 visualisations, 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 the HWV results. In addition, the authors define outflow rate Q_o out of the impeller, and show that the aspect ratio effect upon the outflow-rate coefficient C_<Qo>, is not negligible at aspect ratios less than unity.
2009-11-06