在剪切力和压缩力共同作用下,液体静压轴承黏性油膜的液阻和流速会发生变化,导致油膜的散热能力不稳定,而增加油膜流动阻力,减小流动速度可以有效提高油膜的散热能力.为增加流体的扰动进而增强换热,在静压轴承工作面上加工不同的微结构(矩形、三角形、椭圆形),通过数值仿真方法研究微结构在不同跨度、不同深度、不同间距下对轴承工作面油膜流动速度的影响,得到黏性油膜增阻减速的有效范围.结果表明:综合微结构深度、跨度、间距变化对油膜液阻的影响,矩形微结构增阻效果最明显,椭圆形微结构次之,三角形微结构最差;当微结构间距单一变化时,只有矩形微结构可起到降低流场平均速度的作用.因此,矩形微结构可起到增阻减速的作用,且增阻减速的最佳间距范围为0.01～0.04 mm.
Study on Oil Film Flow Characteristics of Hydrostatic Bearings with Different Microstructures
The liquid resistance and flow rate of the viscous oil film in hydrostatic bearings will change by the combined action of shear force and compression force,resulting in unstable heat dissipation capacity of the oil film.Increasing the oil film flow resistance and reducing the flow velocity can effectively improve the heat dissipation capacity of the oil film.To in-crease fluid disturbance and thereby enhance heat transfer,different microstructures,such as rectangle,triangle,ellipse,were machined on the working surface of the hydrostatic bearing.The influence of the microstructures on the oil film flow velocity of bearing working surfaces at different span,depth and spacing by numerical simulation,and the effective range of the viscous oil film drag enhancement was obtained.The results show that based on the influence of changes in depth,span,and spacing of microstructures on oil film resistance,rectangular microstructure has the most obvious resistance enhance-ment effect,followed by elliptical microstructure,and triangular microstructure has the worst resistance enhancement effect.When the spacing between microstructures varies singly,only rectangular microstructures can reduce the average velocity of the flow field.Therefore,the rectangular microstructures can plays the role of resistance increase and deceleration,and the optimal spacing range for drag increase and deceleration is from 0.01 mm to 0.04 mm.
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万方数据
维普
