A Study of Worn Hybrid Journal Bearing System With Different Recess Shapes Under Turbulent Regime

Abstract

The objective of the present paper is to study analytically the influence of wear on the performance of a capillary-compensated, four-pocket, hybrid journal bearing system operating in a turbulent regime by considering various geometric shapes of recess. The present study deals with bearings having four different geometric shapes of recess, i.e., square, circular, elliptical, and triangular recessed bearings. The wear on the bearing surface is modeled using Dufrane’s abrasive wear model. The Reynolds equation based on Constantinescu’s turbulent lubrication theory has been solved using finite element method along with a restrictor flow equation as a constraint together with appropriate boundary conditions. The numerically simulated results have been presented for a wide range of nondimensional external loads, wear depth parameters, and Reynolds numbers. The numerically simulated results suggest that the combined influence of wear, turbulence, and geometric shape of recess significantly affects the bearing performance. It has been observed that a triangular recessed bearing provides a greater value of minimum fluid film thickness when operating in a turbulent regime. It is also noticed that direct fluid film stiffness coefficients get reduced significantly when bearings operate in a turbulent regime compared with a laminar regime. Further, it is observed that from the viewpoint of fluid film stiffness, a square recessed bearing is found to be most suitable when operating in a turbulent regime.

Influence of surface textures on the hydrodynamic performance of parallel sliding contacts in turbulent regime

“…Most of the texture shapes exhibit similar trend of improvement in performance parameters up to a certain value of aspect ratio and then start decreasing with further increase in the aspect ratio. As far as more improvement in (14) Variation in load support (% )=w Turbulent −w Laminar w Laminar × 100…”

“…They observed that performance parameters may vary depending on the tilting angle and radial adjustments. Nicodemus and Sharma [14] analytically investigated the effect of wear and recess shape on capillary compensated, four-pocket, hybrid journal bearing system running in turbulent regime. Dufrane's abrasive wear model (1983) and Constantinescu's model were used to incorporate wear and turbulent conditions, respectively.…”

A study of capillary-compensated geometrically imperfect six-pocket hybrid journal bearing of various geometric shapes of recess

“…Singh et al 3 studied the influence of geometric shape of recess on the performance of a flexible hybrid journal bearing system. Very recently, Nicodemus and Sharma 4 investigated the effect of geometric shape in conjunction with the effect of wear on the performance of hybrid journal bearing operating in turbulent regime. They extended their research work to investigate the influence of geometric shape of recess on the performance of an orifice-compensated hydrostatic/hybrid journal bearing operating with micropolar lubricant.…”

“…They extended their research work to investigate the influence of geometric shape of recess on the performance of an orifice-compensated hydrostatic/hybrid journal bearing operating with micropolar lubricant. 5 The studies [1][2][3][4][5] reveal that proper selection of the geometric shape of recess is very important to obtain the desired performance of bearing.…”

“…The studies [1][2][3][4][5] dealing with the shape of recess are limited up to four recessed hydrostatic/hybrid journal bearings. Although a comparative study 6 dealing with the influence of number of pocket reveals that for the same value of pocket area, six-pocket journal bearing offers better stability than the four-pocket journal bearing.…”