Abstract
As a kind of water jet technology with strong impinging force and simple structure, the submerged impinging water jet can produce strong scouring action on subaqueous sediments. In order to investigate the flow field characteristics and impinging pressure of submerged impinging water jets at different impinging heights, the Wray-Agarwal (W-A) turbulence model is used for calculation. The velocity distribution and flow field structure at different impinging heights (1 ≤ H/D ≤ 8), and the impinging pressure distribution at the impingement plate under different Reynolds numbers (11, 700 ≤ Re ≤ 35100) are studied. The results show that with the increase of the impinging height, the diffusion degree increases and the velocity decreases gradually when the jet reaches the impingement region. The fluid accelerates first and then decelerates near the stagnation point. The maximum impinging pressure and the impinging pressure coefficient decrease with the increase of the impinging height, but the effective impinging pressure range remains unchanged. In this paper, the distribution characteristics of the impinging pressure in the region of the impingement plate at different heights are clarified, which provides theoretical support for the prediction method of the impinging pressure.
Highlights
Impinging jets are widely used in many fields, such as waste treatment, irrigation and drainage, cooling and heating, chemical vapor deposition and so on
40H/D = 1, a pair of vortices of similar size appear in the jet flow field; various impinging heights
When H/D = 1, a pair of vortices of similar size appear in the jet flow field; When H/D ≤ 3, the size of the vortex is almost unchanged; thereafter the range of influence of the vortex becomes larger as the impinging height increases
Summary
Impinging jets are widely used in many fields, such as waste treatment, irrigation and drainage, cooling and heating, chemical vapor deposition and so on. Singh et al [23] numerically studied the flow characteristics of a turbulent offset jet impinging on a wavy wall surface. The W-A (Wray–Agarwal) turbulence model was used to calculate the submerged impinging jet at different impinging heights (1 ≤ H/D ≤ 8), and the influence of impinging heights on the vertical jet flow field was studied. Inlet surface; the was outflow the leftin and right side in walls is the describe the the top motion in the field, intersection of the of the nozzlethe axisother and surface; surface of jet theflow water tankthe contacts with the air,extension which is line the free surface; the impingement plate was taken as the origin of the coordinate system, and the rectangular surfaces are the wall surface. Surface was set; (4) Inlet wall velocity(m/s) surface: fixed wall surface slip; (5) reference
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