1559 同軸噴流の流れ構造に及ぼす速度比の影響(G05-7 噴流(2),G05 流体工学)

概要

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The aim of the present paper is to clarify the flow structure in a coaxial jet for various velocity ratios at low Reynolds number. The flow visualization by the laser-induced-fluorescence (LIF) technique and the measurements of mean and fluctuating velocities by the particle image velocimetry (PIV) technique were carried out in an open water tank. The Reynolds number based on the outer diameter and the mean velocity of the annular jet was 3000. The mean velocity ratio was changed 0.2 to 1. For the velocity ratios 0.5<U_i/U_o<1, the velocity fluctuation in the mixing region increases than that of the velocity ratio, and the jet width expands. For the velocity ratio near unity (U_i/U_o≈1), the vortices do not appear in the shear-layers. The frequency of velocity fluctuations increases with the increase of the velocity ratio, and so the Strouhal number based on the mean velocity of inner and outer jets is constant.
一般社団法人日本機械学会の論文
2007-09-07