中央に長方形切欠をもつ二次元的ノズルから流出する乱流噴流 : 平均速度場の流れ方向変化

概要

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The mean flowfield of a turbulent air jet issuing from a quasi two-dimensional nozzle with a rectangular notch at the midspan has been measured using linearized constant temperature anemometers. The aim of this study is to examine the effects of the rectangular notch on velocity and length scales of the two-dimensional jet, and to clarify an asymptotic process of the present jet to the two-dimensional jet. In all experiments, Reynolds number based on the nozzle width and the exit mean velocity, was kept constant 13000. Using the experimental results, an interactive region affected by the rectangular notch in each constant section of x/d was defined and an empirical equation of interactive region affected by the rectangular notch in the z direction, was obtained. Furthermore, it was revealed that the streamwise mean velocity U_<ox> on the x axis approached to U_2 and the half width by on the y axis to b_2 of the quasi two-dimensional region, so it was derived that the present flowfield became a two dimensional jet in the far downstream section.
1999-03-25