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Visualization of the flow field in a conined and subemrted impinging jet

机译：在CONONED和子瞬间撞击喷射器中的流场的可视化

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The flow field of a normally impining, axisymmetric, confined and submerged liquid jet is studied using flow visualization. The results are compared with computations and experimental measurements of the flow field, and are used to describe the position of the recirculating toroid in the outflow region which is characteristic of the confined flow, field. Changes in the features of the recirculation pattern due to changes in Reynolds number, nozzle diameter and nozzle-to-target plate spacing are documented. Reuslts are presented for nozzle diameters of 3.18, 6.35, and 12.7 mm, at jet Reynolds numbers in the range of 2000 to 23000, and nozzle-to-target plate spacing of 1, 2, 3, and 4 jet diameters. Up to three interacting vortical sturcturs are observed in the confinement region at the smaller Reynolds numbers. The center of the primary recirculation pattern moves away from the centerline of the jet with an increase in Reynolds number, nozzle diameter, and nozzle-to-target plate spacing. As the recirculating toroid moves away from the jet axis, more of the ambient fluid is entrained into the confinement region.
机译：使用流量可视化研究了常鞘，轴对称，限制和浸没式液体射流的流场。将结果与流场的计算和实验测量进行比较，并且用于描述循环环在流出区域中的位置，该外流区域是受限流动的特征。记录了由于雷诺数，喷嘴直径和喷嘴到目标板间隔的变化引起的再循环模式的特征的变化。 Reuslts以3.18,6.35和12.7mm的喷嘴直径表示，在2000至23000的喷射雷诺数，以及1,2,3和4个喷射直径的喷嘴到目标板间隔。在较小的雷诺数的限制区域中观察到最多三个相互作用的涡流。主再循环图案的中心随着雷诺数，喷嘴直径和喷嘴到目标板间隔的增加而远离喷射的中心线。当循环环体远离喷射轴移动时，更多的环境流体被夹带到限制区域中。

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