C332 音波励起された二次元噴流中の渦構造の三次元的変形

概要

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The effect of three-dimensional vortex structures on vortex pairing and turbulence transition was examined by visualizing vortex tubes in a two-dimensional jet. In case of non-excitation, the vertical vortex tube gently bends in X/2h≓10. As the intensity of acoustic excitation by a sine wave, the wavy vortex tubes kept far downstream. Only when the jet was excited by the sine wave of u_<ƒ>/U_o=±0.08,the vortex structures paired due to the wavy vortex structure. In the case of the bimodal excitation, the wavy structure were observed more upstream as the ratio between subharmonic and fundamental componet, u_s/u_ƒ. The vortex paired by this three-dimensional strucutres. The vortex structure of symmetrical arrangement didn't pair and is maintained in the jet excited by bimodal signal with Φ_<in>=120°
日本流体力学会の論文
2001-07-31