Test and analysis of water-lubricated bearing of seawater desalination pump

Ye Xiaoyan;Feng Yaoning;Wang Jing;Zhang Desheng;Hu Jingning;Naional Research Center of Pumps,Jiangsu University;

seawater desalination pump;;water-lubricated bearing test bed;;rigid body calculation;;pressure pulsation;;journal orbit

In order to study the hydrodynamic lubrication performance of the water-lubricated bearing and the stability of the system at different rotating speeds,the water-lubricated bearing test rig was designed based on the structure of desalination high-pressure pump. The fluid-structure interaction analysis of the bearing-rotor system was conducted by the Rigid Body Method. The journal orbit and bearing pressure fluctuations were monitored in the test,and the numerical simulation was conducted to verify the journal whirling orbit. The results show that there is a little lubrication water in the wedge gap,and the water film pressure is not stable and its distribution is discontinuous at a low rotating speed. With the rotating speed increasing,the lubrication water will increase,and the hydrodynamic effect will enhance,while the pressure distribution and curve will tend to be stable,indicating that the bearing-rotor system becomes stable. With the increase of rotating speed,the thickness of water film and the journal whirling amplitudes increase,and the journal whirling center lifts obviously. By comparing the result of numerical calculation with data from the test,the numerical calculation is proved to be a useful way toanalyze the dynamic characteristic of the rotor-bearing system.