| Cite this article: | 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,():-. |
|
| |
|
|
| This article has been：Browse 2773Times Download 0Times |
|
|
|
| DOI： |
|
| Research and Analysis of Oblique Submerged Impinging Jets at Different Impinging Heights |
|
zhangyingchong1, wangchuan2, chenxinxin1
|
|
1.Research Center of Fluid Machinery Engineering and Technology;2.School of Hydraulic Engineering
|
| 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 |
|
|
|
|
|
|
