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首页> 外文期刊>Journal of Fluid Science and Technology >Effects of Splitter Plates on Turbulent Quantities on a Boundary Layer Developing on a Flat Plate near the Trailing Edge
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Effects of Splitter Plates on Turbulent Quantities on a Boundary Layer Developing on a Flat Plate near the Trailing Edge

机译：分流板对后缘附近平板上边界层湍流量的影响

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摘要

An experimental investigation was made on a turbulent boundary layer near the trailing edge on a long flat plate with a blunt trailing edge. The flow was controlled by an additional splitter plate attached to the trailing edge along the wake center line. The length of the splitter plate, l , was varied from 0.3 to 3 times the trailing edge thickness, h . Measurement of fluctuating velocity was made under the freestream zero pressure gradient. Almost independent of the installation of the splitter plate, the turbulent intensity and the Reynolds shear stress in the inner layer decreased when approaching the trailing edge of the flat plate (x / h =0), compared with that in the fully-developed turbulent boundary layer under the zero pressure gradient. The only exception was the distribution at x / h =0 near the wall in the case without the splitter plate (l / h =0), where the degree of the decrease in u _(rms) / U _(e) was relatively small, and v _(rms) / U _(e) and -uv / U _(e)~(2) were larger than those of the zero pressure gradient. The effect of l / h on turbulent quantities was shown just upstream of the trailing edge upon close comparison, and was classified into two groups: l / h <1 and l / h ≥1. The tendency of the turbulent energy production terms approaching x / h =0 coincided with the decrease in the streamwise turbulent intensity and in the Reynolds shear stress.
机译：在带有钝后缘的长平板上，在后缘附近的湍流边界层上进行了实验研究。通过沿尾流中心线连接到后缘的附加分流板控制流量。分隔板的长度 1在后缘厚度 h的0.3到3倍之间变化。在自由流零压力梯度下测量脉动速度。接近平板的后缘（ x / h = 0）时，内层的湍流强度和雷诺剪切应力几乎与分离板的安装无关，而与在零压力梯度下充分发展的湍流边界层。唯一的例外是在没有隔板的情况下（ l / h = 0）在壁附近的 x / h = 0处的分布，其中< I> u _（rms）/ U _（e）相对较小，而 v _（rms）/ U _（e）和- uv / U _ （e）〜（2）大于零压力梯度。密切比较后，显示了 l / h对湍流量的影响，并将其分为两组： l / h <1和 l / h≥1。湍流能量产生项趋于 x / h = 0的趋势与流态湍流强度和雷诺剪切应力的降低相吻合。

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