基于参数化CAE流程的曲面气浮轴承流场的研究

Research on Surface Gas Bearing Flow Field Based on Parametric CAE Process

气浮技术的典型应用跨立式气浮支撑技术由径向止推轴承和轴向轴承组成。该形式便于加工但组装缝隙会被承载力以杠杆效应放大,导致结构失稳或重启后精度丧失。通过对气体轴承传统模型功用利弊的分析,提出了曲面式气浮轴承,并建立了数值仿真模型,用以分析曲面式气浮轴承与跨立式气浮轴承的承载特性。借助FLUENT与DX模块的参数化设计功能,对该类问题的数值模拟精度提出了解决方案。借用以上方法,求得了该尺寸下具有数值稳定性的离散化模型文件,并应用该文件对曲面气浮轴承进行了仿真研究。结果表明:新式网格无关性数值模拟实验有助于提高数值模拟的计算精度,曲面气浮轴承比较与跨立式气浮轴承具有结构紧凑承载稳定等优点。

A typical application of air flotation technology is across vertical floating support technology that composed of radial thrust hearing and axial bearing. The form to facilitate processing but assembly gap would be amplified by leverage by bearing capacity, which leading to structural instability or loss of accuracy after restart. Through the analysis of the pros and cons of traditional model of gas bearing, a surface type gas bearing was put forward. The numerical simulation model was established, and characteristics of surface type gas bearing and straddle-type gas bearing were analyzed. With the help of FLUENT software and DX module of parametric design function, solution for the numerical simulation precision of this kind of problem was put forward. Use the above method, numerical sta- bility under the dimensions of discretization model file was obtained, which was used to carry out the simulation research of the surface gas bearing simulation. Results show that the new grid independence of numerical simulation experiment is helpful to improve the calculation precision of numerical simulation. Gas bearing surface with straddle-type gas bearing has the advantages of stability and compact in structure as compared to surface gas beating.