半径间隙对水润滑轴承轴心轨迹的影响

为了研究海水淡化高压泵水润滑轴承半径间隙对转子系统稳定性的影响,设计了3种不同半径间隙的水润滑轴承,采用数值模拟和试验研究相结合的方法,对不同半径间隙时的干、湿转子轴心轨迹进行研究.结果表明:随着轴承半径间隙的增大,干转子的涡动中心明显向X,Y轴负方向漂移,而湿转子由于系统的阻尼增大涡动中心变化不明显;湿转子的涡动振幅明显大于干转子的;数值计算的结果与试验结果基本吻合,在轴承间隙较大时,干转子系统稳定性较差,半径间隙为0.1 mm时,润滑效果最好.研究结果为海水淡化高压泵水润滑轴承参数的优化设计提供必要的参考依据.

Study on influences of radial clearance on shaft centerline orbit of water lubricated bearings

Water lubricated bearings with three different radial clearances were designed and their shaft centerline orbits were tracked under dry and wet running conditions to identify effects of radial clearance on the stability of water lubricated bearings-rotor system of high-pressure pumps in sea water desalination process based on experimental and numerical simulation methods. The result shows that with the increase of radial clearance, the whirl center of the dry rotor obviously shifts to the negative X and Y axis directions. However, the variation of whirl center of the wet rotor is not dominated because of the increasing damping in the system. The whirl amplitude of the wet rotor is considerably larger than that of the dry rotor. The numerically calculated results are well in agreement with the experimental data. The stability of the dry rotor system was poorer at a larger radial clearance, the lubrication effect will be better, if the radius clearance is 0.1 mm. This study provides a necessary reference for design parameters optimization of water lubricated bearings of high-pressure pumps in sea water desalination process.