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A Finite Difference Approach to Thermal Effects on Tilting Pad Thrust Bearing Under Isothermal Condition

Vijay Shankar
Lovely Professional University, Phagwara, Punjab, India

DOI: 10.1615/IHMTC-2017.3110
pages 2225-2229

Abstract

Hydrodynamic pad thrust bearings are widely used in high speed rotating machines such as pumps, compressors, turbines, turbo generators etc. because of their low friction, good load carrying capacity and high damping characteristics. Due to progress in technological trends, hydrodynamic pad thrust bearings are now being expected to be compact and work for elevated operating conditions i.e. at high loads and high speeds. Such operating conditions of bearing produce huge viscous heat dissipation in lubrication film. About 60 to 70 % of the generated heat is carried away by lubricant itself through convection mode. However, remaining heat (30 to 40 %) goes in stationary pad through conduction mode. Thus, temperature of pad rises significantly. Being in direct contact of lubricant, heated pad reduces the viscosity of the lubricating oil significantly resulting in thinning of the oil. This causes drastic reduction in film thickness between the mating solids (pad and runner). Such situation may lead to metallic contacts. Therefore, it is essential to suppress the temperature rise of the bearing pad and consequently lubricating oil for achieving the desirable minimum film thickness at the contact. This paper presents detailed investigation pertaining to temperature in film.

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