不同进水压力下水润滑轴承润滑特性试验研究

Study on lubrication characteristics of water lubricated bearings under different inlet pressures

针对海水淡化高压泵水润滑轴承-转子系统在运行过程中由于进水压力的改变而带来的安全、可靠和稳定性等问题,以轴心轨迹以及周向压力脉动为主要研究目标,对干、湿转子在不同进水压力下水润滑轴承轴心轨迹数值模拟,并通过前期设计研制的海水淡化高压泵用水润滑轴承试验台对干、湿转子在不同进水压力下水润滑轴承运行过程中轴心轨迹及周向压力脉动进行试验研究.从计算和试验结果的总体变化趋势可以得知,进水压力对干转子情况下液膜形成的影响较大,而湿转子由于转子系统阻尼因素影响,进水压力对轴心轨迹影响变小,但整体变化趋势与干转子变化趋势相近,对系统整体而言在进水压力为0.2 MPa时,系统运行较为稳定,文中为进一步提高万吨级海水淡化高压泵系统稳定运行提供了一定的研究基础.

The variation of inlet pressure can affect the safety,reliability and stability of the water lubricated bearing rotor system in a seawater desalination high-pressure pump. In this study,numerical simulations were carried out on the shaft orbits of dry and wet rotors under different inlet pressures to clarify the axial force and circumferential pressure distributions. Additionally,the shaft orbits and circumferential pressure fluctuation were measured when the water lubrication bearings were in operation at different inlet pressures based on a water lubricated bearing test stand for seawater desalination high-pressure pumps designed and developed in the first-phase of a project. The simulated and measured results show that the influence of inlet pressure on the liquid film formation is more substantial in the dry rotor. For the wet rotor system,however,due to the damping factor in the system,the influence of the inlet pressure on the axis orbit is smaller,but the overall variation trend is similar to that of the dry rotor. For the system as a whole,the operation of the rotor system is stable as the inlet pressure was at 0.2 MPa. This study has provided some research basis for improving the operational stability of the ro-tor system in a seawater desalination high-pressure pump further.