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首页> 外文期刊>Steel Research International >Non-Circular Hydraulic Jump on a Moving Surface due to an Impinging Circular Free Surface Jet of Water
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Non-Circular Hydraulic Jump on a Moving Surface due to an Impinging Circular Free Surface Jet of Water

机译：撞击水的圆形自由表面射流导致运动表面发生非圆形液压跳跃

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摘要

Liquid jet impingement has many industrial cooling applications such as metal manufacturing and steel cooling on run-out tables (ROT). The development of the wetting front around the impingement point of a jet is central in jet impingement cooling. In this paper, the effects of moving target surface and jet Reynolds number on wetted zone and on the formation and location of hydraulic jump (HJ) are explored through a series of industrial-scale experiments of an impinging circular free surface long water jet with high Reynolds number of 11 000-50 000 and industrial jet parameters. The moving test surface impacts the radial evolution of circular wetted zone in all directions and alter the circular HJ at the wetting front into a non-circular contour that depends on the jet Re number. The limited relations in the literature do not represent these measured shapes and do not appropriately predict radii of HJ in industrial scale. A new correlation for radius of non-circular HJ has been derived in this study that compared more accurately to the experimental data. Numerical simulations of radial impingement flow on moving surface were performed using a variant of k-e turbulent model and results are compared to the experimental data. The computational results for the wetting front were found to be close to the experimental data indicating the appropriate performance of the turbulent model.
机译：液体喷射撞击具有许多工业冷却应用，例如金属制造和跳动台（ROT）上的钢冷却。在射流冲击冷却中，围绕射流冲击点的润湿前沿的发展是关键。本文通过一系列工业规模的高冲击圆形自由面长水射流的工业规模试验，探索了运动目标表面和射流雷诺数对湿区以及水力跃变（HJ）的形成和位置的影响。雷诺数11000-50000和工业喷气参数。移动的测试表面会影响圆形润湿区域在所有方向上的径向演变，并将润湿前部的圆形HJ更改为取决于喷嘴Re数量的非圆形轮廓。文献中有限的关系不能代表这些测得的形状，并且不能适当地预测工业规模的HJ半径。这项研究得出了一种新的非圆形HJ半径相关性，与实验数据进行了比较。使用k-e湍流模型的变体对运动表面上的径向撞击流进行了数值模拟，并将结果与​​实验数据进行了比较。发现润湿前沿的计算结果接近于表明湍流模型具有适当性能的实验数据。

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