Abstract
The increasing ecological awareness and stringent requirements for environmental protection have led to the development of water lubricated journal bearings. For the investigation of water-lubricated journal bearings, a new structured mesh movement algorithm for the CFD model is developed and based on this method, the nonlinear transient hydrodynamic force model is established. Then, with consideration of velocity perturbation, a method to determine dynamic coefficients and linear hydrodynamic forces is promoted. After validation of static equilibrium position and stiffness coefficients, a comparative linear and nonlinear hydrodynamic force analysis of multiple grooves water-lubricated journal bearings (MGWJBs) is conducted. The calculation results indicate that the structured mesh movement algorithm is suitable for the dynamic characteristics investigation of water-lubricated journal bearings. And the comparative study shows that there is a considerable difference between the linear and nonlinear hydrodynamic forces of MGWJBs. Further investigation should be carried to evaluate the dynamic responses of rotor supported by MGWJBs under difference force models.
Highlights
The increasing ecological awareness and stringent requirements for environmental protection have led to the development of water lubricated journal bearings in many applications where oil was used as the lubricant [1]
With consideration of velocity perturbation, an efficient method to determine dynamic coefficients and linear hydrodynamic forces is promoted based on the calculation of 3D transient flow field
The conclusions drawn from the study can be summarized as follows: – a self-developed structured mesh movement algorithm is used to insure the high quality of the grid in the transient calculation process of water-lubricated journal bearings
Summary
The increasing ecological awareness and stringent requirements for environmental protection have led to the development of water lubricated journal bearings in many applications where oil was used as the lubricant [1]. The key applications of water-lubricated journal bearing include marine propulsion systems, water pumps and hydraulic turbines [2]. To facilitate the hydrodynamic process, the constant supply of water is commonly fed into the bearing clearance through longitudinal grooves to maintain the thin fluid film between the journal and bearing. The dynamic characteristics of a rotor supported by water lubricated journal bearings include unbalance response and whirling instability. Those characteristics can be investigated by two methods: the linearized method and nonlinear transient analysis. A small perturbation is given to the journal around static equilibrium position and the stiffness and damping coefficients can be determined
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