微孔几何轮廓对浮环气膜密封动压润滑特性的影响

目的 充分研究微织构几何轮廓对浮环气膜密封润滑特性的影响，调节微尺度流动，提高密封综合性能，为气膜浮环密封的优化设计提供理论基础。方法 基于气膜润滑理论，建立表面织构化浮环密封的润滑模型，以圆形、正方形、椭圆形、三角形4种轮廓微织构孔为研究对象，采用有限差分法对流体动压控制方程进行数值求解，获得密封间隙内气膜压力分布，通过试验验证理论模型的正确性和有效性，并考察不同几何轮廓的微织构孔对浮环密封性能的影响规律。结果 微织构孔均可产生显著的流体动压效应，具有三角形轮廓特征的微织构孔在综合密封性能上表现出最佳效果，其次是椭圆形、正方形，最后是圆形。在相同工况条件下，不同几何轮廓的微织构孔对密封性能参数的影响具有相似的规律。其中，转速、压力和偏心率的增大均可提高气膜浮升力;随着压力和偏心率的增加，泄漏率迅速升高，随着转速的升高而缓慢下降;气体摩擦力随着转速、压力和偏心率的升高而升高。结论 在轴套表面合理设计微纹理，并对不同几何轮廓微孔所适应的工况参数进行了研究，明确了不同工况下织构类型的选择和优化。研究结果可为浮环气膜密封的轴套加工制造提供理论依据，具有实际应用价值。

Effect of Micro-pore Geometric Configuration on Dynamic Lubrication Performance of Floating Ring Gas Seal

In order to explore the effect of diverse micro-pore geometric configurations on the performance parameters of floating ring air-film seal, an intricate and elaborate lubrication model was employed for surface-textured floating ring seals based on the principles of gas film lubrication theory. Four distinct categories of micro-textured apertures, namely circles, squares, ellipses, and triangles, were meticulously selected as the focal points for comprehensive and in-depth inquiry. The intricate and complex fluid dynamic pressure control equations were deftly and expertly managed by the finite difference method, thereby precisely and accurately determining the intricate distribution of gas pressure within the sealing gap. The experimental validation unequivocally affirmed the precision, exactitude, and validity of the painstakingly constructed and meticulously refined theoretical model. The work aimed to delve into the profound and far-reaching effect exerted by micro-textured apertures exhibiting diverse geometric configurations on the sealing performance of the floating ring. The empirical findings incontrovertibly and irrefutably indicated that micro-textured apertures possessed the inherent and remarkable capability to engender and elicit profound hydrodynamic pressure effects, with linear profile characteristics decidedly and markedly surpassing their curvilinear counterparts in terms of sheer performance and efficacy. The hierarchical ordering of impact on the overall sealing performance was meticulously and scrupulously determined to be triangle, ellipse, square and circle. Under comparable operational conditions that were meticulously devised and rigorously calibrated, micro-textured apertures featured distinct geometric configurations exhibited and manifested analogous and akin variations in the parameters governing and dictating the performance of the sealing mechanism. The augmentation and escalation of rotational speed, inlet pressure, and eccentricity occurred in a concurrent and harmonious manner, invariably leading to a proportional and commensurate augmentation and escalation of the opening force. As the depth and dimension of the micro-textured apertures gradually and incrementally increased and expanded, an easily discernible and palpable attenuation and diminution in the dynamic pressure ensued, thereby culminating in a reduction and decrement in the overall magnitude and magnitude of the opening force. In tandem and synchronization with the heightened and elevated levels of inlet pressure, eccentricity, and the depth of the micro-textured apertures, the leakage rate displayed and exhibited a pronounced and conspicuous escalation and amplification, while concurrently revealing and exhibiting a gradual decline and descent with the progressive advancement and acceleration of rotational speed. The gas friction force, with its inherent and innate propensity and tendency to increase and amplify, exhibited and demonstrated a steadfast and unwavering positive correlation and correspondence with the escalation, augmentation, and upswing of rotational speed, inlet pressure, and eccentricity. In contrast, the gas film friction force, affected and governed by its own set of dynamics and characteristics, evinced and showed an inverse and opposite relationship and association with the depth and dimension of the micro-textured apertures. The far-reaching and significant research findings derived from the meticulous and exhaustive research endeavor provide and furnish a robust and resilient theoretical framework that serves as an indispensable and indispensable guiding reference and compass for the meticulous and precise fabrication and production of the shaft sleeve within the realm and domain of the floating ring gas seal.