The Research On Temperature Viscosity Relationship And Fluid Flow Characteristics In The Sliding Bearing Flow Field

Sliding bearing are the important load-bearing parts which support and fixed the rotating machinery such as steam turbines,gas turbines and large gas compressors.At present,the high speed and large bearing capacity sliding bearing will cause severe temperature rise of the bearing because of the dynamic lubrication pressure as well as the friction between the rotor and the sliding bearing.High bearing temperature will lead to oil’s viscosity fell sharply,which directly affect the performance of bearings and even the safe and stable operation of the whole equipment.The research on the related aspects has become a hot issue.Under these conditions,this paper do the research of the temperature viscosity relationship and the temperature field distribution of the inner and outer wall of the sliding bearing.On the basis of above theory,this paper do the research of the flow characteristics of the sliding bearing which are numerically simulated and calculated.The main work which has been done in this paper is as follows:The first step is to build the on-line viscosity measurement experiment of the lubricating oil.In this paper,the temperature viscosity characteristics of lubricating oil under the flow condition were studied.After the establishment of the linear-processing relationship between temperature and viscosity at different flow rate,the paper found that flow rate have a non monotonic effect on the temperature and viscosity characteristics,and piecewise function can be better described the effect of temperature and viscosity characteristics in the different temperature ranges.The second step is to regard the one oil inlet hole cylindrical sliding bearing as the research object,designing and checking the main axle and bearing bush of the experiment bench,then modeling and meshing the sliding bearing.After the above work,temperature inversion model has been established through the ANSYS Mechanical APDL.Under the unperturbed environment,the paper did research on the temperature inversion model in different speed and load conditions.Finally,the hydrodynamic lubrication theory and the classical two-dimensional Reynolds equation can be simplified to the Reynolds equation with variable viscosity condition.The finite difference method is used to program the model and calculate numerically,which lead that the viscosity field distribution of the oil film can be obtained by calculating the temperature filed distribution of the oil film,then get the oil pressure field distribution andthus establish flow characteristics sliding bearing model.Compared with the fixed temperature pressure field distribution condition,the analysis found that the viscosity field distribution lead by the temperature field distribution when considering the change of oil film clearance,and ultimately affecting the distribution of pressure field and sliding bearing capacity of oil.All of the above can provide guidance for more comprehensive and accurate analysis of the flow characteristics in the sliding bearing flow field.