C334 同軸噴流の強制加振における位相差の影響

概要

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Coaxial jets have been experimentally studied, and both the outer annular jet and the inner circular jet were excited by the sound wave from speakers with a controlled initial phase difference. We measured the velocity and turbulent intensity distributions of the excited coaxial jets with a velocity ratio of 0.6 and the forcing frequency of 333Hz, which is a half of natural vortex frequency. It is found that the intensity of the fluctuating velocity in the mixing region and the flow rate for the excited on both jets depend on the initial phase difference. The present results indicate that for excitation of the phase difference Φ=0°, the intensity of fluctuating velocity in both mixing regions increases, while for the excitation of the phase difference Φ=260°, the turbulence intensities in the mixing regions can be reduced than the excitation of the other phase difference.
日本流体力学会の論文
2001-07-31