针对可倾瓦滑动轴承稳定性机理研究方法不完善的问题,提出可倾瓦滑动轴承三维润滑流场计算方法.该方法基于计算流体动力学软件FLUENT、结合自行开发的动网格算法可对可倾瓦滑动轴承三维润滑流场进行瞬态计算,与转子动力学计算耦合可以得到可倾瓦滑动轴承-多圆盘转子系统在不同转速下的轴心轨迹.对可倾瓦滑动轴承-多圆盘转子系统进行不同转速下的振动试验,测试轴颈的振幅以及涡动中心的偏移情况.结果表明,相比常规固定瓦滑动轴承(圆柱、椭圆和三油楔轴承),可倾瓦滑动轴承得到的轴心轨迹幅值更小、涡动中心沿载荷作用方向下沉更低且偏位角几乎为零,试验结果与理论计算吻合一致.
A three-dimensional (3D) lubrication flow field calculation method of tilting-pad journal bearings (TPJBs) was presented in order to solve the problem that the stability mechanism research method of TPJBs is not perfect at present.The calculation method was based on CFD software FLUENT and a selfdeveloped dynamic mesh updating algorithm could be used for transient calculations of 3 D lubrication flow field of TPJBs.When coupled with rotor dynamics calculations,shaft center whirl orbits of TPJB-multidisc rotor system under different rotational speeds could be calculated.Vibration tests of the TPJB-multidisc rotor system under different rotational speeds were conducted on a test rig in order to obtain vibration of the shaft and drift of the shaft center.Results show that TPJBs have smaller amplitude,lower whirling center along load direction and almost negligible attitude angle compared to conventional fixed sliding surface journal bearings (cylinder,ellipse,and three oil wedge bearings).The experimental results accorded with the theoretical results.