インデューサ入口に生じる逆流旋回流と渦構造に関する研究〔流体工学, 流体機械〕

概要

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This paper presents a vortex structure at the inlet of an inducer which appears on the boundary of backflow regions. The vortex structure was visualized using vortex cavitations by operating at cavitation number σ=0.050 and recorded by a high speed video. The vortex structure was also observed by using two laser displacement sensors. An FFT analyzer couldn't be used to determine the passing frequency because the periodicity of vortex passage is very weak, i. e., rather irregular. The passing frequency and the shape of vortex lines were determined by counting the pulse from laser displacement sensors which responds to the passage of vortex cavitation. The results show that the number of vortices, its strength, its travelling velocity are functions of flow coefficient and depend on a steady flow velocity profile.
社団法人日本機械学会の論文
1998-06-25