| CHEN Shi-ming,CHEN Yan,CHEN Wen-zhuo,JIANG Jun-ze,ZHOU Shuang.Numerical Simulation of Film Formation on V-shaped Surface by Spraying[J],52(6):285-295 |
| Numerical Simulation of Film Formation on V-shaped Surface by Spraying |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.06.025 |
| KeyWord:V-shaped surface film-forming characteristics spray flow field CFD Euler-Euler method |
| Author | Institution |
| CHEN Shi-ming |
Department of Petroleum, Army Logistics University, People's Liberation Army of China, Chongqing , China |
| CHEN Yan |
Department of Petroleum, Army Logistics University, People's Liberation Army of China, Chongqing , China |
| CHEN Wen-zhuo |
State Key Laboratory of NBC Protection for Civilian, Beijing , China |
| JIANG Jun-ze |
Department of Petroleum, Army Logistics University, People's Liberation Army of China, Chongqing , China |
| ZHOU Shuang |
Department of Petroleum, Army Logistics University, People's Liberation Army of China, Chongqing , China |
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| Abstract: |
| The work aims to establish a computational fluid dynamic (CFD) simulation model for in-depth research of film-forming characteristics on V-shaped surface by spraying, in order to provide theoretical support for optimizing the trajectory of the spray gun and obtaining an ideal film. The mathematical model of film formation was established by the Euler-Euler method to solve the over-simplification problem of the empirical model and the limitations of the Euler-Lagrange method, and the unstructured grids and adaptive-mesh refinement were adopted to discretize the computational domain. The model established was solved with the SIMPLE algorithm of the phase solver based on pressure and spray experiments were conducted to verify the correctness of the model. By analyzing the results of the numerical simulations, the spray flow field characteristics and film thickness distribution law of spraying the V-shaped surface were obtained. The effect of the V shape on the spray flow field in the long axis direction was greater than that on the spray flow field in the short axis direction. Compared with the spray flow field of the plane spraying, the horizontal shape of the spraying flow field of the V-shaped surface was almost the same except that of the inner wall surface spraying was significantly different when the Z-axis distance was 140 mm. With the increase of the Z-coordinate value, the horizontal spraying shape changed from the ellipse to the long strip. The longitudinal shape of the spray flow field was quite different when it was close to the wall in the long-axis direction. Their tail shapes in the order of plane spraying, outer wall spraying and inner wall spraying were in a straight line, an inverted V shape, and a V shape, respectively. The spraying coverage of the outer wall was wider, and that of the inner wall was narrower. Besides, the horizontal expansion degree of the spraying had a linear relationship with the value of coordinate Z. The film shapes on the inner and outer walls of the V-shaped surface were all elliptical, and their thickness decreased along the radial direction. The film on the outer wall had the larger halo width than that on the plane, yet with a generally lower thickness. The film on the inner wall was just the opposite. As the angle of the V-shaped surface became larger, the thickness of the film center increased continuously. The thickness distribution of the film in the short axis direction was single-peak, while the thickness distribution of the film on the outer wall in the long axis direction was double-peak, and that of film on the inner wall varied with the angle. It is concluded that the film-forming model on sprayed V-shaped surface and film-forming characteristics obtained are correct, and the V-shaped surface greatly changes the characteristics of the spray flow field and the film during the air spraying process. Film-forming numerical simulation on sprayed V-shaped surface is of great theoretical and practical significance for revealing the film-forming characteristics of spraying complex free-form surfaces with large curvature, optimizing the spray gun trajectory and improving the film quality, etc. |
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