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 : 付加ひずみ速度と乱流運動エネルギー生成(流体工学,流体機械)

概要

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The aim of this study is to clarify the streamwise variation of the production terms for the three-dimensional turbulent air jet issuing from a quasi two-dimensional nozzle affected by the additional strain rate caused by the rectangular notch, and to examine the advection transport of the mean flow and the turbulent kinetic energy affected by the inward secondary flow. The Reynolds number based on the nozzle width and the exit mean velocity, was kept constant 13000 through this experiment. From this experiment, it was revealed that adding the rectangular notch to the two-dimensional jet, the region of |∂U/∂y|≒0 was generated on the rectangular notch axis in the upstream region, therefore the production of turbulent kinetic energy was suppressed there. Furthermore, the turbulent kinetic energy on the y axis was transported toward the jet center region by the turbulent advection term, this is a reason of that the turbulent kinetic energy on the x axis took the maximum value at the section of x/d=45 which is more downstream section compared to that of the two-dimensional jet.
2004-07-25