航空学报2025，Vol.46Issue(15)：35-54,20.DOI:10.7527/S1000-6893.2024.30928
多叶波箔型动压气体径向轴承流弹耦合数值分析
Numerical investigation of aero-elastic coupling in multi-leaf wave foil type dynamic pressure gas radial bearings
摘要
Abstract
To reveal the fluid structure coupling mechanism of multi-leaf wavy foil type dynamic pressure gas bear-ings,a coupling analysis method was established for the shear flow and elastic foil combination deformation in the rotating-static multi-wedge channel of this type of bearing.The parameter distribution of the unsteady flow field of the rotating-static gap gas film and the unsteady deformation of the elastic foil combination were numerically studied.The research results confirm that there was a strong aero-elastic coupling effect in dynamic pressure gas bearings of the multi-leaf wave foil type.When multiple wedge-shaped channels were coupled with eccentricity,different elastic foils correspond to multiple discrete high/low pressure zones in the gas film.The high pressure zone was located in the convergence area of the channel,while the low pressure zone was located at the sudden expansion step connected to adjacent foils.The local expansion of flow channels in the high-pressure zone induced flow separation and increases shear flow instability.The fluid-elastic coupling weakened the pulsation amplitude in the high-pressure region of the gas film,and strengthened the pressure pulsation amplitude in the low-pressure region.The 1st and 2nd elastic foils deformed in the direction of the bearing sleeve,while the 4th and 5th elastic foils deformed in the direction of the rotat-ing shaft,which corresponds to the distribution of the high-pressure and low-pressure areas of the rotating-static air film.The low-pressure zone of the static gas film induced separation between the top foil and its adjacent overlapping foil.The influence of rotational speed,eccentricity,clearance scale,and elastic foil stiffness on the fluid-elastic cou-pling performance of bearings was obtained.The gas film pressure in the fluid domain is positively correlated with the bearing capacity,speed,and eccentricity,while negatively correlated with the clearance scale.High rotational speed and large eccentricity induced an increase in the peak value of the low-pressure region in the gas film.In aero-elastic coupling,there was a certain lag in the vibration frequency of the top foil compared to pressure pulsation.And the am-plitude of foil vibration and gas film pressure pulsation in the high-pressure region of the fluid domain were greater than that in the low-pressure region of the fluid domain.The results in this study provide theoretical basis and technical quid-ance for the design of airborne multi-leaf wave foil dynamic pressure gas.关键词
多叶波箔型动压气体轴承/多箔叠加/多楔形气膜间隙/双向流固耦合/多物理场Key words
dynamic pressure gas bearing of the multi-leaf wave foil type/multi-foil stacking/multi-wedge air film gap/Bi-directional fluid structure coupling/multi physical fields分类
航空航天引用本文复制引用
吕元伟,赵韫铎,张镜洋,陈丽君,肖思维..多叶波箔型动压气体径向轴承流弹耦合数值分析[J].航空学报,2025,46(15):35-54,20.基金项目
国家自然科学基金(52206091) National Natural Science Foundation of China(52206091) （52206091）
