The Dynamic Characteristic Analysis of the Water Lubricated Bearing-Rotor System in Seawater Desalination Pump

Abstract

In order to study the water lubricated bearing-rotor system in seawater desalination pump, this paper is based on the coupling between the lubricating flow field and the rotor dynamics. The fluid-solid interaction (FSI) method, Rigid Body, was adopted to study the journal orbit of the bearing-rotor system under the periodic unbalancing load. The influences of geometric and working parameter to the journal orbit were combined to analyze the stability and reliability of the bearing-rotor system. The result shows that increasing the rotating speed would increase the journal whirling amplitude and the system sensitivity to the external excitation and unbalancing load were promoted; increasing the aspect ratio would reduce the journal whirling amplitude and cause the system to be more unstable; increasing the inlet pressure would reduce the journal whirling amplitude and cause the system to be more unstable; increasing the unbalancing load would reduce the stability margin and the system is easy to be unstable if obstructed; increasing the radial clearance would reduce the journal whirling amplitude and cause the system to be more unstable. The attitude angle has no influence on the journal whirling amplitude but would influence the stability of system and the value of attitude angle should not be large.

A novel approach to investigate temperature field evolution of water lubricated stern bearings (WLSBs) under hydrodynamic lubrication

“…The interests in environment-friendly technologies have stimulated by the strict regulations and the enhancement of environmental awareness, particularly in oil-lubricated bearings replaced with water lubricated ones. Water lubricated bearings have been widely used in hydroelectric turbine, 1 nuclear main pump, 2 machine tool 3 and other industrial equipment with the advantages of low cost, simple structure, environmental friendly and satisfied tribological properties. It is also popular in ship propulsion system due to its good adaptability to shaft misalignment caused by manufacturing error, improper installation and hull deformation.…”

Synthesis of Novel High Flux Thin-Film Nanocomposite Nanofiltration Membranes Containing GO–SiO2 via Interfacial Polymerization

“…However, seawater contains a large amount of inorganic salts such as NaCl, Na 2 SO 4 , and MgSO 4 , which cannot be consumed directly. Desalination has been considered to be one of the major methods to produce safe and clean drinking water at present and in the future. , Various technologies have been developed for desalination such as multistage flash, multieffect distillation, vapor compression, electro-dialysis, and so forth. However, researchers are urged to look for more energy-efficient solutions for large-scale desalination with the increment of energy costs.…”

Investigations of the micro surface shape for the gear-shaft/journal-bearing interface in water hydraulic internal gear pumps

“…[10][11][12] Yin et al 13 investigated the flow field of the journal bearing in water hydraulic axial piston pumps, focusing on the material combination and the structure of the bearing. Ye et al 14 investigated the dynamic behavior of the bearing-rotor system in seawater desalination pumps, focusing on the influence of the geometric and working parameters on the system stability. However, the aforementioned works are carried out under HL and the bearing surface elastic deformation is not taken into account.…”