Performance behaviour of elliptical-bore journal bearings lubricated with solid granular particulates--颗粒学报PARTICUOLOGY

Rahmani, F., Dutt, J. K., & Pandey, R. K. (2016). Performance behaviour of elliptical-bore journal bearings lubricated with solid granular particulates. Particuology, 27, 51-60. https://doi.org/10.1016/j.partic.2015.12.009

Performance behaviour of elliptical-bore journal bearings lubricated with solid granular particulates

Faisal Rahmani ^*, Jayanta K. Dutt, Raj K. Pandey

Department of Mechanical Engineering, Indian Institute of Technology, Delhi, New Delhi 110016, India

10.1016/j.partic.2015.12.009

Volume 27, August 2016, Pages 51-60

Received 30 July 2015, Revised 24 December 2015, Accepted 30 December 2015, Available online 22 April 2016, Version of Record 14 June 2016.

E-mail: mez128249@mech.iitd.ac.in

Highlights

• Importance of powder particle based lubrication at high temperature was studied.

• Large size particles exhibited high load carrying capacity and improved stability of bearing.

• Irrespective of particle size, side leakage does not vary for short and finite bearings.

Abstract

Journal bearings operating in hot environments and at high temperatures experience accelerated degradation of lubricating oils. In such situations, dry granular particulates have emerged as potential media for providing lubrication in journal bearings in place of lubricating oils. Granular particulates do not degrade thermally, even at considerably high temperatures. This work explores the static and dynamic performance characteristics of elliptical-bore journal bearings lubricated with granular particulates. It is found that a bearing lubricated with a larger size (2 μm) particles offers better performance compared with that using smaller size (1 μm) particles. Bore ellipticity reduces the load-carrying capacity and increases side leakage and the coefficient of friction; however, rotor stability is marginally improved at low eccentricity ratios (<0.6), followed by significant improvement at high eccentricity ratios (>0.6).

Graphical abstract

Keywords

Particulate; Journal bearing; Grain size; Rigid rotor stability; Hydrodynamic lubrication

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