軸対称噴流の渦輪挙動に対する周期的じょう乱の効果

概要

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With artificially introduced periodic disturbances, the behavior of ring vortices in an axisymmetric jet has been experimentally studied using flow visualization and a hot-film anemometer. The excitation frequency is varied in the range of 0〜12 Hz, while the amplitude is kept constant at a=0.5 mm. The Reynolds number is about 6000. It is shown that the influence of excitation frequencies on the initial growth of the ring vortex structure is appreciable. When the excitation frequency is nearly equal to one-half of the natural rolling-up frequency of ring vortices, the ring vortices are symmetric and grow in size. Consequently, the turbulence intensity at the jet centerline is the most amplified. When the excitation frequency is equal to the rolling-up frequency, a vortex-pairing event occurs at a fixed streamwise location.
一般社団法人日本機械学会の論文
1994-06-25