Numerical simulation on spreading of oblique jet impinging onto a wall

被引：0
作者：
Tang L. [1 ]
Wang K. [1 ]
Li W. [1 ]
Liu Y. [1 ]
Zhang B. [1 ]
Ren X. [1 ]
机构：
[1] Science and Technology on Liquid Rocｋet Engine Laboratory, Xi’an Aerospace Propulsion Institute, Xi’an
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 04期
基金：
中国国家自然科学基金;
关键词：
jet impinging onto a wall; liquid film; mesh adaptive method; oblique jet; spread of liquid film;
D O I：
10.7527/S1000-6893.2021.26428
中图分类号：
学科分类号：
摘要：
In order to deepen the understanding of the liquid film formed by the spreading of the jet impinging onto the plate，the numerical simulation of the oblique jet impinging onto the wall was carried out in this paper. The two-phase numerical simulation of the liquid film spreading process after the jet impinge onto the wall was carried out using mesh adaptive method. The spreading process，flow field structure and local flow characteristics of the wall impingement zone were obtained and analyzed under typical working conditions. The key characteristics of the liquid film can be clearly identified from numerical simulation results，and the comparison with the experimental results also shows the feasibility and accuracy of the numerical simulation method. Through numerical simulation，it is found that after the jet impinges onto the wall，the flow takes the stagnation point as the center and spreads around in a radial structure. After merging into the hydraulic-jump zone at the edge of the liquid film，the flow direction deflects and continues to flow downstream. This is the basic process of the jet impinging the wall and spreading to form the liquid sheet. Inertial force drives the liquid film to radiate outward and spread out. Then，under the influence of the surface tension and surface contact angle at the edge of the liquid film，a high pressure zone of the liquid film is formed and pushes the liquid film to shrink. The inertia force of the liquid film decreases gradually under the shear action of the wall until it is in balance with other forces such as the surface tension at the edge of the liquid film. Thus，the boundary of the liquid film is de⁃ termined. The numerical simulation results also verify that the stagnation point of the flow in the impingement zone is near a focal point of the elliptical contact surface between the jet and the wall. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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