Orientation effect on sealing characteristics of rectangular micro-textured floating ring gas film
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摘要:
为研究微织构的方向效应对浮环气膜密封性能参数的影响，选取矩形微织构孔为研究对象，基于气体润滑理论，建立该织构化流体动压润滑控制的理论分析模型并采用有限差分法对其进行求解，获得了密封间隙气膜的压力分布，以转速、压力、偏心率、织构深度为自变量，重点研究织构方向角对其密封性能参数影响的规律。结果表明：开设微织构的浮环密封浮升力随着转速、压力和偏心率的增大均可提高，但微织构孔深度的增大会导致浮升力下降。泄漏率随着转速、压力、偏心率和织构深度的增加而提高；但转速的升高对其泄漏率数值影响不大。气膜摩擦力随转速、压力和偏心率的变大而升高，随织构深度的增大而降低。矩形微织构在改善密封性能参数方面起着重要的作用，合理的选择微织构方向角，可有效地提高浮环气膜密封的密封性能。研究结果为提高织构化表面浮环密封性能设计提供了新思路。
Abstract:To investigate the orientation effect of micro-texture on the sealing performance parameters of the floating ring gas film, a rectangular micro-textured hole was selected as the study object. A theoretical analysis model of textured hydrodynamic lubrication control was developed based on gas lubrication theory, and the finite difference method was used to solve the model. The gas film pressure distribution in the sealing gap was obtained. With rotational speed, pressure, eccentricity, and texture depth as independent variables, this study primarily investigated the influence of texture direction angle on sealing performance parameters. The results indicate that the sealing uplift of the micro-textured floating ring increases with rotational speed, pressure, and eccentricity, while increasing micro-textured hole depth results in a decrease in the uplift. Furthermore, the leakage rate increases as rotational speed, pressure, eccentricity, and texture depth increase. However, an increase in rotational speed has little effect on the leakage rate value. The gas film friction also increases with the increase in rotational speed, pressure, and eccentricity and decreases as the texture depth improves. Rectangular micro-texture plays a crucial role in improving the sealing performance parameters. The rational selection of micro-texture direction angle can effectively enhance the sealing performance of the floating ring gas film. These study outcomes provide a novel idea for enhancing the sealing performance of the textured surface floating ring.
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图 6 浮环气膜密封计算模型结果验证
Figure 6. Verification of calculation model results of floating ring gas film seal
图 7 不同倾角矩形微织构的气膜厚度分布及其气膜压力分布示意图
Figure 7. Thickness distribution and pressure distribution of rectangular micro-textured gas film with different angles
图 8 密封性能参数随转速和织构方向角度的变化曲线
Figure 8. Variation curves of sealing performance parameters with rotational speed and texture direction angle
图 9 密封性能参数随压力和织构方向角度的变化曲线
Figure 9. Variation curves of sealing performance parameters with pressure and texture direction angle
图 10 密封性能参数随偏心率和织构方向角度的变化曲线
Figure 10. Variation curves of sealing parameters with eccentricity ratio and texture direction angle
图 11 密封性能参数随结构深度和织构方向角度的变化曲线
Figure 11. Variation curves of sealing parameters with texture depth and texture direction angle
表 1 织构化浮环气密封的工况参数和几何参数
Table 1. Operating conditions and geometric parameters of textured floating ring gas seal
参数 数值 轴套外半径/mm 25 平均气膜厚度/μm 5 介质气体黏度/(Pa·s) 1.8×10−5 偏心率 0.7 轴套长度/mm 52 出口压力/MPa 0.101325 入口压力/MPa 0.7 转速/(r·min−1) 16000 介质气体密度/(kg·m−3) 1.1452 轴向织构间距/mm 3.36 周向织构间距/mm 2.9 织构长度/mm 12 织构宽度/mm 2 织构深度/μm 2 轴向织构个数 10 周向织构个数 10 
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