S0502-1-6 円軸円形噴流における三次元流れ構造の数値シミュレーション([S0502-1]噴流,後流および剥離流れ現象の解明と制御(1))

概要

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The flow structures in a coaxial jet with axisymmetric and helical instability modes for a comparatively low Reynolds number were investigated. Three-dimensional numerical simulation of a coaxial jet was performed using the commercial CFD software FLUENT6.3. The numerical simulation obtained vortex shedding frequencies were in good agreement with the results of the experiment. It was confirmed that the helical vortex was shed for the range of velocity ratios from 0.5 to 1.0. For the coaxial jet with helical instability, it was found that the axial velocity along the centerline of the jet decreased more than that of the coaxial jet with axisymmetric instability, and the amplitude of the axial velocity fluctuation was small near the nozzle exit. Consequently, the increased velocity fluctuations and Reynolds stress in the mixing region were associated with the arrangement of the vortex street in the shear layer.
一般社団法人日本機械学会の論文
2010-09-04