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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer
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An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer

机译：湍流边界层中流向和跨向加速度影响的实验研究

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摘要

We compare two turbulent boundary layers produced in a low-speed water channel experiment. Both are subjected to an identical streamwise pressure gradient generated via a lateral contraction of the channel, and an additional spanwise pressure gradient is imposed on one of the layers by curving the contraction walls. Despite a relatively high streamwise acceleration, hot-film probe measurements of the mean-velocity distributions show that the Reynolds number increases whilst the coefficient of friction decreases downstream. Visualization of the viscous layers using hydrogen bubbles reveal an increase in the non-dimensional streak spacing in response to the acceleration. Changes in statistical moments of the streamwise velocity near the wall suggest an increased dominance of high-velocity fluctuations. The nearwall streaks and velocity statistics have little sensitivity to the boundary layer three-dimensionality induced by the spanwise pressure gradient, with the boundary-layer crossflow velocity reaching 11 % that of the local freestream velocity.
机译：我们比较了低速水道实验中产生的两个湍流边界层。两者都经受通过通道的横向收缩而产生的相同的沿流向的压力梯度，并且通过使收缩壁弯曲而在层之一上施加附加的沿翼向的压力梯度。尽管沿流方向的加速度较高，但热膜探针对平均速度分布的测量结果表明，雷诺数增加，而下游的摩擦系数减小。使用氢气泡的粘性层的可视化揭示了响应于加速度的无量纲条纹间距的增加。靠近壁面的水流速度的统计矩的变化表明，高速波动的支配性增加。近壁条纹和速度统计数据对翼展方向压力梯度引起的边界层三维不敏感，边界层错流速度达到局部自由流速度的11％。

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