Performance evolution of fully and partially textured hydrodynamic journal bearings lubricated with two lubricants

Auteurs :  N. Tala-ighil, M. Fillon
Année : 2017
Domaine : Génie mécanique
Type : Article de journal
Revue : IOP Conference Series: Materials Science and Engineering
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés : journal bearing, texture, hydrodynamic, lubrication

Résumé : 

This study investigates the evolution of the main bearing performance of partiallyand fully textured hydrodynamic journal bearing. The viscosity effect is also analysed by themean of numerical simulations for two types of oil: the oil 1 (ISO VG 32, 31.3 cSt at 40 °C)has a lower viscosity than oil 2 (ISO VG 100, 93 cSt at 40 °C). Reynolds equation is solved byfinite difference and Gauss-Seidel methods with over-relaxation for various operatingconditions. It is shown that, under hydrodynamic lubrication regime, the improvement of themost important characteristics (the friction coefficient and minimum film thickness) of atextured journal bearing depend strongly on the lubricant viscosity and the journal rotationalspeed. The fully textured journal bearing is highly favorable at very low speeds while thepartially textured journal bearing is more suitable for slightly higher speeds. The gain inbearing performance due to the texturing of the bushing disappears at a critical speed of thejournal and then, for higher rotational speeds, the presence of textures becomes detrimental.