悬臂式柔性支撑柱面气膜密封力学性能研究

基于三维SolidWorks软件建立柱面气膜悬臂式柔性支撑结构模型，分析柔性支撑结构对柱面气膜密封结构稳定性的影响；采用单向流固耦合的仿真方法，研究悬臂支撑板厚度、支撑结构材料、悬臂支撑数量，以及气膜操作参数转速和压差，对悬臂式柔性支撑结构和浮环的最大变形、最大应力应变有影响。结果表明：随悬臂支撑板厚度增大，平均变形量和平均等效应力减小；随悬臂支撑板数量增加，最大变形量逐渐减小，最大等效应力先增大后减小；研究的铝合金、铍青铜、不锈钢及钛合金4种悬臂支撑板中，不锈钢材料悬臂支撑板的最大变形量最小，承受的最大等效应力最大；随着转速和压差的增加，悬臂支撑板最大变形量以及最大等效应力均逐渐增加。在研究范围内，柔性支撑结构可以减小浮环的变形量，浮环变形量小于最小气膜厚度，保证了密封结构稳定运行。

Research on Mechanical Performance of Cantilever Flexible Supporting Cylindrical Gas Film Seal

The cylindrical air film cantilever flexible support structure model was established based on the three-dimensional SolidWorks software,and the influence of the flexible support structure on the stability of the cylindrical air film seal structure was analyzed.By using a one-way fluid-solid coupling simulation method,the influence of the thickness of cantilever support plate,the material of cantilever flexible support structure,the number of cantilever supports,and the gas film operating parameters of rotational speed and differential pressure on the maximum deformation,maximum stress and strain of cantilever flexible support structure and floating ring were studied.The results show that as the thickness of the cantilever support plate increases,the average deformation and the average equivalent stress decrease.With the increase of the number of cantilever support plates,the maximum deformation gradually decreases,and the maximum equivalent stress first increases and then decreases.Among the four cantilever support plates of aluminum alloy,beryllium bronze,stainless steel and titanium alloy,the maximum deformation of stainless steel cantilever support plate is the smallest and the maximum equivalent stress is the largest.cylindrical gas film seal structure.With the increase of rotational speed and pressure difference,the maximum deformation and the maximum equivalent stress of the cantilever support plate increase gradually.Within the scope of research,the flexible support structure can reduce the deformation of the floating ring,and the deformation of the floating ring is less than the minimum gas film thickness,which ensures the stable operation of the sealing structure.