Abstract
The optimum dimensions of spiral-grooved thrust bearings are determined for both incompressible and compressible fluids, together with the relationships between the optimum dimensions and the steady-state flow characteristics. The Reynolds equation and the modified Reynolds equation are numerically solved by the finite-element method, taking into consideration the wall slip condition. The calculated results reveal that the through-flow rate takes the maximum at the optimum dimensions, and that the optimum spiral angle is larger and the optimum groove depth is smaller in incompressible fluid than in compressible fluid. It is also revealed that the inclination of the bearing plate causes little change in the bearing load capacity in spite of considerable nonaxisymmetricity of pressure distribution.
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