| 引用本文: | 张颖翀,王 川,陈欣欣,等.不同冲击高度下斜向淹没冲击射流的研究分析[J].灌溉排水学报,2020,39(12):71-77. |
| ,et al.不同冲击高度下斜向淹没冲击射流的研究分析[J].灌溉排水学报,2020,39(12):71-77. |
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| 摘要: |
| 【目的】研究不同冲击高度H/D对斜向淹没冲击射流的影响。【方法】采用Wray-Agarwal湍流模型和PIV试验，研究了恒定冲击角度（?=45?）下不同冲击高度的斜向淹没冲击水射流。【结果】随着冲击高度的不断增大，滞止点SP逐渐远离冲击原点GC，向逆流方向移动；射流流程增加，射流抵达冲击壁面前的扩散程度增强，近壁区无量纲速度V/Vj的最大值和最大压力系数逐渐减小；有效冲击压力集中在-2≤x/D≤2区域内。【结论】冲击高度通过影响射流的发展，影响斜向淹没冲击射流流场结构，而壁面有效冲击压力范围独立于冲击高度。 |
| 关键词: 斜向淹没冲击射流；冲击高度；流场结构；冲击压力 |
| DOI：10.13522/j.cnki.ggps.2020011 |
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| Operation of Oblique Submerged Jet Impingement as Impacted by Impingement Height |
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ZHANG Yingchong, WANG Chuan, CHEN Xinxin, MENG Weixiao
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1. Research Center of Fluid Machinery Engineering Technology, Jiangsu University, Zhenjiang 212013, China; 2. School of Hydraulic Engineering, Yangzhou University, Yangzhou 25000, China; 3.Jinfeng (China) Machinery Industry Co., Ltd., Ningbo 315000, China
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| Abstract: |
| 【Background】Submerged jet impingement refers to fluid flow that enters a medium and impinges the solid surface after being ejected from the nozzle. It is widely used in areas including dissipating energy in water cushion ponds, underwater dredging and reef cutting in water conservancy projects, as well as landing and take-off of aircrafts. Its operation depends on many factors.【Objective】The purpose of this paper is to investigate experimentally and numerically the effects of impingement height on operation of an oblique submerged impingement jet.【Method】PIV experiment was conducted first to obtain data and the Wray-Agarwal turbulence model was used to simulate the impact of the impingement height on operation of the oblique submerged water impingement jet with a constant impingement angle q=45°.【Result】Comparison of the W-A model and the six k-ε turbulent models - standard k-ε, RNG k-ε, realizable k-ε, standard k-ω and SST k-ω - for constant angle q=45° and impingement height H/D=3 against the PIV results showed that the W-A model was most accurate for simulating flow in the oblique submerged impingement jet system. As the height H/D increased, the stagnation point moved away from its origin toward the counter-current (-x) direction. As a result, both jet flow and the diffusion increased after reaching the impingement wall. The maximum dimensionless velocity V/Vj in the proximity of the wall decreased consistently while the maximum pressure coefficient shifted in the counterflow direction. With a further increase in the impingement height H/D, the maximum pressure coefficient gradually decreased. Under different H/D, the effective pressure on the wall concentrated in the region -2≤x/D≤2.【Conclusion】The impingement height affected jet operation and the fluid flow field in the oblique submerged impingement jet system, while the distribution of the effective pressure on the wall was independent of the impingement height. |
| Key words: oblique submerged impinging jet; impingement height; flow field structure; impact pressure |
