Research On Static Characteristics Of Machine Tool Spindle Hydrodynamic Journal Bearing Based On FLUENT

Now domestic and overseas scholars usually use the finite difference method or the finite element method to research the static and dynamic characteristics of the different structure journal bearings. In order to simplify the mathematical models, these methods often neglect the influence of other factors such as inertia source term and oil film curvature and so on, in addition, research on characteristics of complex shape bearing is very difficult through the finite difference method.In this paper, hydrodynamic journal bearing is treated as research object. First, set up oil film models of different work conditions and different parameters journal bearing based on Gambit, write UDF program to control half-Sommerfeld boundary condition. Second, under the condition of laminar or turbulent, simulate the change rule of-oil film capacity and oil film pressure field with eccentricity, shaft neck speed, slenderness ratio and interstice ratio based on FLUENT. The simulation results are as follows:(1) Whether in the laminar or turbulence conditions, the incremental quantity of the maximum pressure value gradually increased with the increase of the eccentricity, the incremental quantity is bigger in the turbulent condition than in the laminar condition. In certain speed, the incremental quantity of bearing capacity increased with the increment of eccentricity.(2) In certain eccentricity, the maximum pressure value linearly increased with the increment of the rotational speed, and the linearly incremental factor increased with the increment of eccentricity. Bearing capacity increased with the increment of the rotational speed.(3) Whether in the laminar or turbulence conditions, the maximum pressure value increased with the increment of slenderness ratio; In laminar conditions, the incremental quantity of the maximum pressure value is approximately equal; in the turbulent conditions, the incremental quantity of the maximum pressure value gradually diminished. In certain eccentricity and the speed of shaft neck, bearing capacity increased with the increment of slenderness ratio, and the incremental quantity of bearing capacity diminish with the increment of slenderness ratio.(4)In certain eccentricity and the speed of shaft neck, the maximum pressure value minished with the increase of interstice ratio, Decrement of the maximum pressure value has nothing to do with the speed of shaft neck. Decrement of bearing capacity minished with the increment of interstice ratio.Studying the static and dynamic characteristics of hydrodynamic-hydrostatic bearing and float ring hydrodynamic-hydrostatic bearing based on FLUENT is feasible in the future.