S054101 周囲と密度の異なる噴流のプリファード周波数([S05410]噴流,後流,およびはく離流れの基礎と応用:最前線(10))

概要

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This report aims at investigating the relationship between preferred frequency of jets and density. The disturbance frequency for mixing control based on the preferred frequency occur in a jet flow initial area of a jet column mode is often selected to enhance the diffusion of the jet flow. Air, CO_2, and He were used for jets and surroundings. Nozzle was used converging round nozzle (d=10mm). The laser light sheet technique was applied to the visualization of a cross section of vortex ring. The variation of velocity of a jet flow was measured by the hot wire anemometry and PIV to investigate the preferred frequency to determine the Strouhal number. The distance until rolling up to the vortex ring goes away from the nozzle as increasing the density ratio. The Strouhal number does not depend on Reynolds number and keep an almost constant value. These show the relationship between preferred frequency and diffusion by jet density with different surrounding gas.
一般社団法人日本機械学会の論文
2011-09-11