| HU Qiong,LU Di,XIAO Yang,WANG Xiao-lei,WANG Yan,ZHANG Qing-shuo,ZHU Xian-lei.Method for Improving Liquid Film Seal Performance Based on Groove Surface Texture Modification[J],51(7):150-160 |
| Method for Improving Liquid Film Seal Performance Based on Groove Surface Texture Modification |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.014 |
| KeyWord:liquid film seal micro texture diversion sealing performance super-slippery surface |
| Author | Institution |
| HU Qiong |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China;National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics & Astronautics, Nanjing , China |
| LU Di |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China |
| XIAO Yang |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China |
| WANG Xiao-lei |
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics & Astronautics, Nanjing , China |
| WANG Yan |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China |
| ZHANG Qing-shuo |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China |
| ZHU Xian-lei |
Jiangsu Ocean Univesity, Jiangsu Lianyungang , China |
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| Abstract: |
| The paper aims to modify the groove surface of traditional liquid film seal by micro ordered texture to adjust the micro scale flow and improve the comprehensive performance of the seal. The fluid flow state between seal end faces is confirmed according to the flow factor ξ, the steady-state performance of the seal is numerically simulated by the finite volume method, and the correctness of the algorithm is verified by comparing with the existing literature; the variation laws of opening force and pumping rate with and without surface micro-texture design under different geometric and working parameters are systematically compared, and the influence mechanism of groove texture on seal performance is explained. The results show that the textured groove can not only improve the hydrostatic pressure in the sealing gap, but also realize directional diversion and enhance the hydrodynamic pressure; when the texture is extremely consistent with the flow direction of the fluid (under the present working conditions, α=10º-15º), it can show a good diversion effect; by increasing the texture density, n, or increasing the ratio of texture width and spacing, Bm/Cm, to properly reduce the texture spacing, Cm, can enhance the diversion effect; micro-texture design will not change the optimization results of groove parameters, and there is a wide range of texture structure parameters, which makes the sealing performance with texture better than that without micro texture; textured seal has better stability maintenance and leakage suppression effect at high speed and large groove depth. Reasonable design of ordered micro texture on the surface of liquid film seal groove region can further effectively improve the opening force of liquid film and reduce the leakage rate on the basis of better groove structure. According to the analysis results, the assumption that "the super- slippery surface design of groove can greatly improve the opening performance and pumping capacity of the liquid film seal on the premise that the flow field is highly matched with the direction of the fluid groove" is put forward. |
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