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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of flow dynamics of sweeping jets impinging upon confined concave surfaces
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Experimental investigation of flow dynamics of sweeping jets impinging upon confined concave surfaces

机译：撞击在有限凹面上的清扫射流流动动力学的实验研究

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摘要

The flow fields of a sweeping jet impinging on a confined concave wall are experimentally investigated at different Reynolds numbers and surface curvatures by time-resolved particle image velocimetry (TR-PIV). Three Reynolds numbers (Re = 1650, 3300 and 6601) are considered. With the increase of Reynolds number, the profile of jet oscillation changes from a sawtooth wave, to a sinusoidal wave and finally a square wave, due to the intensified intrinsic bi-stability. Then, concave surfaces with three different diameters (R = infinity, 20 D-h and 10 D-h) are placed at a fixed distance of 5.5 D-h (jet hydrodynamic diameter) from the jet throat. The curved shape of the impingement wall has a notable impact on the flow behaviors. In contrast to the case of a flat impingement wall (R = infinity), a pair of large trapped vortices is identified on the lateral recirculation regions of the sweeping jet impinging upon the most curved wall (R = 10D(h)). The strong outer vortices induce a marked enhancement of fluctuating velocity in regions far from the primary jet impact. The flow dynamics associated with the wall of intermediate curvature (R = 20D(h)) generally show transitional behaviors. (C) 2019 Elsevier Ltd. All rights reserved.
机译：通过时间分辨粒子图像测速仪（TR-PIV），在不同的雷诺数和表面曲率下，实验研究了撞击在受限凹壁上的清扫射流的流场。考虑了三个雷诺数（Re = 1650、3300和6601）。随着雷诺数的增加，由于固有的双稳性增强，射流振荡的轮廓从锯齿波变为正弦波，最后变为方波。然后，将三个不同直径（R =无穷大，20 D-h和10 D-h）的凹面放置在距射流喉部5.5 D-h（射流流体动力学直径）的固定距离处。冲击壁的弯曲形状对流动行为有显着影响。与平坦的冲击壁（R =无穷大）的情况相反，在撞击最弯曲的壁的清扫喷流的侧向再循环区域（R = 10D（h））上发现了一对大的捕获涡流。强大的外部涡流在远离一次喷气冲击的区域引起了明显的脉动速度增强。与中间曲率（R = 20D（h））的壁相关的流动动力学通常显示出过渡行为。 （C）2019 Elsevier Ltd.保留所有权利。

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