基于N-S方程的多孔质气膜悬浮力学模型研究

为了研究多孔质气浮承载系统设计参数对气膜厚度的影响特性,以平行圆板模型为对象,建立了包含多孔质特性和缝隙流特性的气膜悬浮静态模型,分析了承载系统多孔质部分的受力特性,得出了气膜厚度控制方程,并利用改进弦截法进行求解。理论计算和实验结果对比表明,基于气膜简化模型的数值计算结果与实验值吻合较好,验证了理论模型的有效性。通过数值计算结果,探讨了通气量和承载力变化对气膜厚度的影响规律。研究表明,气膜厚度受通气量及承载力的影响,可通过对通气量及承载力进行最优控制,以使气膜厚度满足环境使用要求。

Mechanical model of pneumatic levitation using porous media based on N-S equation

A model of aerostatic thrust bearing including the characteristics of porous media and gap flow was established within a parallel plate in order to analyze the fly height characteristics of air film.The equation was solved by using modified secant method.Theoretical and experimental results show that calculated results which based on the simplified model of air film accord well with the experimental date.It turns out that the theoretical model is effective.The effects of air flow rate and bearing capacity on the fly height of air film were discussed through numerical results.The research indicates that the fly height of air film increases and the increment speed tends slow as a bearing capacity increases.In a certain range the fly height increases as the air flow rate increases and it declines over this range.Based on that,we can adjust the fly height with optimal way through controlling bearing capacity and air flow rate to satisfy the environmental requirements.