Investigation of a Turbulent Radial Wall Jet
Investigation of a Turbulent Radial Wall Jet
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DOI：
10.1115/1.3607705
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发表时间：
1967-06
期刊：
影响因子：
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通讯作者：
M. Poreh;Y. G. Tsuei;J. Cermák
中科院分区：
文献类型：
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作者：
M. Poreh;Y. G. Tsuei;J. Cermák
本文测量了圆形射流冲击光滑平板形成的径向壁面射流的平均速度、湍流强度、雷诺应力和壁面摩擦力。壁射流的平均速度被发现是相似的，可以与最大速度和射流厚度在每个站，除了一个温和的雷诺数附近的墙壁依赖。无量纲径向速度分布与Glauert [1]建议的形式很好地一致，尽管射流厚度的变化与他的预测不一致。它示出在这里，这种差异如下从Glauert的普朗特涡粘性模型在描述雷诺应力分布的使用。我们的测量结果表明，剪切应力不消失的速度梯度为零，在自由射流的情况下，或所需的涡粘性模型。壁面射流中的壁面摩擦力大于相应的摩擦管流。这种增加可能是由于射流外部区域中的大湍流波动，其影响壁区域的结构。
In this paper measurements are presented of mean velocities, turbulence intensities, Reynolds’ stresses, and the wall friction in a radial wall jet formed by an impinging circular jet on a smooth flat plate. The mean velocities of the wall jet are found to be similar and can be correlated with the maximum velocity and jet thickness at each station, except for a mild Reynolds number dependence near the wall. The dimensionless radial velocity profile is in good agreement with the form suggested by Glauert [1] although the variation of the thickness of the jet does not conform to his predictions. It is shown here that this discrepancy follows from Glauert’s use of the Prandtl eddy viscosity model in describing the Reynolds’ stress distribution. Our measurements show that the shear stress does not vanish where the velocity gradient is zero, as in the case with a free jet, or as required by the eddy viscosity model. The wall friction in the wall jet is found to be larger than the corresponding friction pipe flow. This increase is probably due to the large turbulent fluctuations in the outer region of the jet, which affect the structure of the wall region.