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首页> 外文期刊>Aerospace >Effects of Nozzle Pressure Ratio and Nozzle-to-Plate Distance to Flowfield Characteristics of an Under-Expanded Jet Impinging on a Flat Surface
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Effects of Nozzle Pressure Ratio and Nozzle-to-Plate Distance to Flowfield Characteristics of an Under-Expanded Jet Impinging on a Flat Surface

机译：喷嘴压力比和喷嘴到平板距离对未膨胀射流撞击平面的流场特性的影响

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摘要

The current work experimentally investigates the flowfield characteristics of an under-expanded turbulent jet impinging on a solid surface for various nozzle-to-plate distances 2.46 D j , 1.64 D j , and 0.82 D j ( D j is the jet hydraulic diameter), and nozzle pressure ratios (NPRs) ranging from 2 to 2.77 . Planar particle image velocimetry (PIV) measurements were performed in the central plane of the test nozzle and near the impingement surface. From the obtained PIV velocity vector fields, flow characteristics of under-expanded impinging jets, such as mean velocity, root-mean-square fluctuating velocity, and Reynolds stress profiles, were computed. Comparisons of statistical profiles obtained from PIV velocity measurements were performed to study the effects of the impingement surface, nozzle-to-plate distances, and NPRs to the flow patterns. Finally, proper orthogonal decomposition (POD) analysis was applied to the velocity snapshots to reveal the statistically dominant flow structures in the impinging jet regions.
机译：当前的工作是通过实验研究在喷嘴到板距离为2.46 D j，1.64 D j和0.82 D j（D j是射流水力直径）的情况下，撞击在固体表面上的膨胀不足的湍流射流的流场特性，和喷嘴压力比（NPRs）在2到2.77之间。在测试喷嘴的中心平面和撞击表面附近执行了平面粒子图像测速（PIV）测量。从获得的PIV速度矢量场中，计算了膨胀不足的撞击射流的流动特性，例如平均速度，均方根脉动速度和雷诺应力分布。比较从PIV速度测量获得的统计曲线，以研究撞击表面，喷嘴到板的距离以及NPR对流型的影响。最后，将适当的正交分解（POD）分析应用于速度快照，以揭示撞击射流区域的统计主导流动结构。

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