| 引用本文: | 张颖翀,王川,陈欣欣.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,0,():-. |
| zhangyingchong,wangchuan,chenxinxin.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,0,():-. |
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| 摘要: |
| 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实验，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: 关键词：斜向淹没冲击射流、Wray-Agarwal湍流模型、冲击高度、流场结构、冲击压力 |
| DOI： |
| 分类号:O356 |
| 基金项目:脉冲式淹没冲击射流非定常水力特性与冲刷性能研究 |
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| Research and Analysis of Oblique Submerged Impinging Jets at Different Impinging Heights |
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zhangyingchong1, wangchuan2, chenxinxin1
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1.Research Center of Fluid Machinery Engineering and Technology;2.School of Hydraulic Engineering
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| Abstract: |
| Abstract：【Background】Submerged impingement jet refers to the flow of fluid that enters the same medium and impinges on the solid surface after being ejected from the nozzle or slit, and blends with the environmental fluid. Submerged impact jets are widely used in real life and engineering, such as water cushion pond energy dissipation, underwater dredging and reef cutting in water conservancy projects; aircraft takeoff and landing in the aerospace field; cooling of electronic components and paper drying in the heat treatment industry. As a classic flow model, submerged impinging jets have extensive engineering application background and academic research value.【Objective】The effects of different impact heights H/D on oblique submerged impact jets are systematically studied.【Method】The Wray-Agarwal turbulence model and PIV experiments were used to study the oblique submerged impinging water jets with different impact heights at a constant impact angle (?=45?).【Result】By comparing W-A, standard k-ε, RNG k-ε, realizable k-ε, standard k-ω, and SST k-ω, a total of 6 turbulence models for a fixed impact angle ?=45? and impact height H/D=3 Numerical simulation results and PIV test results of oblique submerged impact jet, It is found that the W-A turbulence model has good prediction performance for oblique submerged impact jets. As the impact height of the jet continues to increase, the stagnation point SP moves in the counter-current (-x) direction and gradually moves away from the impact origin GC; The jet flow is increased, and the degree of diffusion when reaching the impact wall is increased; The maximum value of the dimensionless velocity V/Vj in the near-wall region keeps decreasing. The maximum pressure coefficient shifts in the counterflow direction. As the impact height continues to increase, the maximum pressure coefficient gradually decreases. Under different impact heights, the effective impact pressure on the impact wall surface is concentrated in the region -2≤x/D≤2.【Conclusion】The impact height affects the development of the jet, and influences the oblique submerged impact jet flow field structure, and the effective impact pressure range on the wall is independent of the impact height. |
| Key words: Key world: Oblique submerged impinging jet, Wray-Agarwal turbulence model, impact height, flow field structure, impact pressure |
