急拡大管内乱流脈動拘束噴流の速度と乱れ強さ

概要

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A pulsating jet issuing from a nozzle into a circular channel expansion was measured by means of a hot wire anemometer. The results were compared with those obtained for steady confined jets in the same apparatus. The flowfield can be classified into the jet region and the developing flow region. Deceleration of flow promoted the production of free turbulence in a separated shear layer in the jet region and subsequent radial propagation of the generated turbulence. Meanwhile, acceleration had the opposite effect. Therefore, the pulsating jet spreads wider in the decelerating period than in the accelerating period. Velocity and turbulence intensity profiles are almost uniform near the limit between the two regions. The growth rate of the boundary layer in the developing flow region is greater in the decelerating period than in the accelerating period.
1990-06-25