S0504-1-5 低レイノルズ数領域における二次元噴流の可視化と速度分布の測定(噴流,後流および剥離流れの流動解析と応用(その1))

概要

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A two-dimensional jet is a basic, free shear flow. The analytical solution of velocity for a laminar tow-dimensional jet was given by Bickley. The critical Reynolds number of the two-dimensional jet was obtained using linear stability theory. However, the characteristics of the jet at very low Reynolds numbers have not been confirmed by an experiment, because it is very difficult to conduct the experiment. We deal with the two-dimensional jet within the range of Reynolds number from 10 to 200. The jets were visualized by smoke and the velocity was measured by a hot wire anemometer. From the flow visualization of the jet flows, the flow pattern of the jets may be classified to 3 kinds, and it is expected that the critical Reynolds number is between 50 and 60. Mean velocity variations on the streamwise direction are partially in agreement with the Bickley's jet.
2009-09-12