织构化表面的润滑特性及推力轴承应用研究

发布时间：2018-08-30 08:53

【摘要】：在流体润滑状态下,适当的表面织构可强化动压润滑性能,可以起到减摩润滑的作用,这是许多中外学者的普遍认识,但是在织构结构参数对润滑性能的影响方面仍然存在许多需要深入研究的问题。本文主要探讨在流体润滑状态下,表面织构结构参数与雷诺数对润滑性能的影响规律,研究结果对于摩擦副表面织构的设计具有借鉴意义。本文以两平行平面间的矩形截面织构为研究对象,建立了无量纲表面织构CFD分析模型；采用基于N-S方程的FLUENT软件对所建立的模型进行求解,得到流域内的流体流线分布情况、织构表面的压力分布曲线以及表面作用力。通过对不同织构结构参数与雷诺数下织构模型的求解结果进行分析比较发现：织构可以改变织构表面的压力分布,影响承载力；当雷诺数与织构宽度一定时,流域内存在一个出现涡流的织构深度临界值,即最佳织构深度,此时织构表面的动压润滑性能最优,对于矩形截面织构,无量纲最佳织构深度取值范围为0.4-0.6。在对矩形截面织构进行研究的基础上,本文对截面形状为圆弧、梯形、等腰三角形以及直角三角形(A、B)的另外六种织构进行了分析,并对以上七种织构的动压润滑性能进行比较后发现：织构截面形状会影响织构表面的动压润滑性能；当雷诺数与织构宽度一定时,无量纲深度d*为0.6的收敛直角三角形A织构具有最佳的动压润滑性能。基于织构表面动压润滑性能分析结果,对织构在推力滑动轴承中的应用进行了初步的研究,针对标准斜-平面推力轴承,应用CFD数值模型方法求解的结果与解析法求解结果相一致,证明了CFD数值模型的适用性；利用该模型对斜-平面推力轴承的承载力研究发现：由于织构的存在,轴承的承载能力比光滑表面有所提高；轴承承载能力的提高主要是由瓦块表面最大压力位置到收敛端上的织构引起的。
[Abstract]:Under the condition of fluid lubrication, proper surface texture can enhance the hydrodynamic lubrication performance and play the role of friction-reducing lubrication, which is widely recognized by many scholars at home and abroad. However, there are still many problems about the influence of texture parameters on lubrication performance. In this paper, the effects of surface texture parameters and Reynolds number on the lubrication performance under the condition of fluid lubrication are discussed. The results are useful for the design of surface texture of friction pairs. This paper takes the texture of rectangular section between two parallel planes as the research object, establishes the dimensionless surface texture CFD analysis model, uses the FLUENT software based on N-S equation to solve the established model, and obtains the fluid streamline distribution in the basin. The pressure distribution curve and the surface force on the texture surface. By analyzing and comparing the solution results of texture model with different texture parameters and Reynolds number, it is found that texture can change the pressure distribution of texture surface and affect the bearing capacity, and when Reynolds number and texture width are fixed, There is a critical value of texture depth with eddy current in the basin, that is, the optimum texture depth, in which the hydrodynamic lubrication performance of the texture surface is optimal, and the dimensionless optimum texture depth ranges from 0.4-0.6 for the rectangular cross-section texture. On the basis of studying the texture of rectangular section, the other six kinds of texture with circular arc, trapezoid shape, isosceles triangle and right angle triangle (AZB) are analyzed in this paper. After comparing the hydrodynamic lubrication properties of the seven textures, it is found that the shape of texture cross section will affect the hydrodynamic lubrication performance of texture surface, and when the Reynolds number and texture width are fixed, The convergent right triangle A texture with dimensionless depth d * 0.6 has the best hydrodynamic lubrication performance. Based on the results of dynamic lubrication analysis on the surface of texture, the application of texture in thrust plain bearing is studied preliminarily, aiming at the standard oblique plane thrust bearing. The results obtained by using the CFD numerical model method are consistent with those obtained by the analytical method, which proves the applicability of the CFD numerical model, and studies the bearing capacity of the oblique plane thrust bearing by using the model. The bearing capacity of the bearing is higher than that of the smooth surface, and the increase of bearing load capacity is mainly caused by the texture from the maximum pressure position of the tile surface to the convergent end.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH117.2;TH133.3

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