中文摘要：

本文采用CFD数值模拟方法和试验数据相结合的方式对半球型动压气浮轴承径向偏心3%和轴向偏心3%的流场进行分析。对轴承同一偏心率下有、无螺旋槽的轴径向刚度、轴径向承载力、姿态角、功率等特性进行了比较。结果表明,半球型动压气浮轴承的数值仿真结果与试验数据吻合较好。刻有螺旋槽的轴承,压力沿螺旋槽逐渐上升,在螺旋槽顶达到峰值,跨过螺旋槽后压力逐渐降低。由于圆周均布了多个螺旋槽,螺旋槽的导流作用使得高压区均匀的分布在轴承圆周面上。没有螺旋槽的轴承在径向偏心时存在一个对称分布的高压区和低压区,二者夹角近似180度,但在轴向偏心时却无法形成动压效应,轴承支撑力几乎为0。相比无螺旋槽的轴承,有螺旋槽压力分布更均匀,能提供轴、径向支撑力,且姿态角和功率更小,更有助于电机稳定的高速旋转。

英文摘要：

In this paper,CFD numerical simulation method and experimental data are combined to analyze the radial eccentric 3% and axial eccentric 3% flow field of the hemispherical Journal bearing.The radial stiffness,axial radial bearing capacity,attitude angle and power of the shafts with and without spiral grooves under the same eccentricity ratio of the bearings are compared The results show that the numerical simulation results of the hemispherical pneumatic journal bearing are in good agreement with the experimental data.With the spiral groove bearing,the pressure gradually rises along the spiral groove,reaches the peak at the top of the spiral groove,and decreases gradually after the spiral groove.Because the circle is distributed with a plurality of spiral grooves,the diversion action of the spiral groove makes the high voltage region uniformly distribute on the circumferential surface of the bearing.When there is no radial groove,there is a symmetrical distribution of the high pressure zone and the low pressure zone The angle between the two is approximately 180 degrees,but it can not form the dynamic pressure effect when the axial eccentric,and the supporting force of the bearing is almost 0.Compared with the spiral groove bearings,the spiral groove has more uniform pressure distribution,providing axial and radial support,and smaller angle and power,which is more helpful for the stable high-speed rotation of the motor.