特殊结构超导球形转子气浮平衡装置的气膜分析（英文）  

ANALYSIS OF GASEOUS FILM FOR BALANCE MEASUREMENT DEVICE OF INCOMPLETE SPHERICAL SUPERCONDUCTING ROTOR WITH AIR SUSPENSION

作　　者：高霏[1,2] 王晖[1,2] 王秋良[1,2] 胡新宁[1,2] 崔春艳[1,2] 刘建华[1,2] 

机构地区：[1]中国科学院电工研究所应用超导重点实验室,北京100190 [2]中国科学院大学,北京100039

出　　处：《低温物理学报》2014年第4期257-262,共6页Low Temperature Physical Letters

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.51107135)~~

摘　　要：本文设计了一种六孔侧吹式静压气体球轴承,利用气浮法对非完整球形的超导转子进行静平衡检测.由于转子采用超导铌制成,薄壁空心,在4.2K极低温条件下工作,并高速旋转,要求转子具有较高的平衡精度,针对本文提出的测量方法,在测量过程中,转子自由悬浮,作用于转子表面的支撑力引起守恒干扰力矩,以及作用于转子表面的粘性剪应力引起非守恒干扰力矩,都是静平衡装置设计过程中不容忽视的关键部分,所以本文就此问题进行分析.在一定假设条件下,根据气体润滑理论和粘性流体动力学中的Navier-Stokes方程,推导得出垂直于转子表面的支撑力的计算公式以及流体粘性剪应力的计算公式,以及与轴承各设计参数之间的关系,根据静压气体球轴承设计尺寸得出各作用力的大小.A spherical bearing with compressed air which has six gas inlet holes distributed evenly on the spherical cavity is designed. It is used to support static balance measurement of the incomplete spherical superconducting rotor using flotation method. During the measurement, the rotor is suspended freely. Both the conservative disturbing torque caused by supporting force acting on the surface of the rotor, and the non-conservative disturbing torque by viscous shear stress on the surface of the rotor, are key parts that cannot be neglected in the design process of static balance measurement device. Under certain assumptions, according to the gas lubrication theory and the Navier- Stokes equations of viscous fluids theory, the equations of supporting force perpendicular to the surface of the rotor and the viscous stress is deduced to obtain the relationship between forces and design parameters of the bearing. The forces is calculated according to the design dimensions of the spherical bearing with compressed air.

关 键 词：静压气体球轴承 气膜 超导转子 静平衡 

分 类 号：O511[理学—低温物理]