周囲と密度の異なる円形噴流拡散とプリファード周波数との関係(安定性・乱流境界層・せん断流・遷移(4),一般講演)

概要

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This study aims at the relationship between round jet diffusion and preferred frequency. The disturbance frequency for mixing control is often selected to the enhancement of jets diffusive mixing based on the preferred frequency of the column mode generated in a jet flow initial area. When the diffusive mixing enhancement such as the gaseous fuel and air is assumed, it is general that a jet flow and a surrounding gas are different. It can be observed that the distance until growing up to the vortex ring goes away from the nozzle as increasing the density ratio. The Strohal number doesn't depend on Reynolds number and keep an almost constant value. The wavelength of preferred frequency is longer as increasing density ratio.
日本流体力学会の論文
2009-09-02