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为了解决传统R eyno lds方程无法求解盘片表面形貌突变处压力分布的问题,采用N-S方程和有限体积法对磁盘磁头间隙润滑进行数值分析。使用形貌突起高度、密度和占空比3个参数描述盘片表面的规则矩形横向形貌,并通过分析流场压力和速度的分布,解释了不同形貌参数对润滑阻力的影响。结果显示,由于矩形形貌的影响,形成了压差阻力,压差阻力随形貌突起高度或密度的增加而增大,随突起占空比的增加而减小。摩擦阻力的大小取决于近壁面流场的速度梯度,而形貌参数是该速度梯度的决定因素之一。压差阻力和摩擦阻力的综合作用决定了盘片表面的总阻力。
In order to solve the problem that the traditional R eyno lds equation can not solve the pressure distribution at the abrupt change of the disk surface morphology, the N-S equation and the finite volume method are used to analyze the disk head gap lubrication. Using the three parameters of topography height, density and duty cycle, the regular rectangular transverse morphology of the disk surface is described. The influence of different topography parameters on the lubrication resistance is explained by analyzing the distribution of pressure and velocity in the flow field. The results show that the pressure drop resistance is formed due to the influence of the rectangular topography. The pressure drop resistance increases with the increase of the height or density of the topography and decreases with the increase of the protrusion duty ratio. The magnitude of frictional resistance depends on the velocity gradient of the near-wall flow field, and the topography parameter is one of the determinants of this velocity gradient. The combined effect of differential pressure resistance and frictional resistance determines the total resistance of the disk surface.