Hydrodynamics plain bearings of aircraft engine


Аuthors

Marchukov E. Y.1*, Nazarenko Y. B.1**, Marishkin V. V.2

1. Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia
2. Lytkarinsky Machine-building Plant-branch of the United Engine Corporation Ufa Engine Industrial Association, 16 Budennogo Avenue, Moscow, 105118

*e-mail: okb@okb.ru
**e-mail: nazarenko.yuri@gmail.com

Abstract

The paper examines liquid-film friction in plain journal bearings of aircraft engines with smooth liners, considering oil leakage through the bearing’s lateral ends. Under liquid-film friction conditions, the working load-bearing surfaces of the shaft (journal) and the bearing liner (thrust surface) are separated by an oil film whose thickness must exceed the sum of the surface roughness heights of both contacting surfaces. The influence of oil leakage is analysed using an analytical method for fluid flow between parallel plates. Based on an analytical solution of the Navier–Stokes hydrodynamic equations, the fluid flow patterns along the oil path in both the circumferential and lateral directions, as well as the hydrodynamic pressure in the wedge-shaped clearance of the plain bearing, are established.
The authors have developed a calculation methodology for plain bearings in the presence of oil leakage at the lateral ends. A computational study was performed using a plain bearing model with specified bearing parameters. This yielded the distribution of hydrodynamic pressure in the circumferential direction across three cross‑sections along the width of the half‑ring.
The study reveals fluid flow patterns in plain bearings and determines the hydrodynamic pressure distribution along the width of the shaft journal under conditions of oil leakage at the bearing’s lateral ends. These results allow for a more accurate assessment of the bearing’s load‑carrying capacity.

Keywords:

rotor, shaft, bearing, hydrodynamic forces, wedge‑shaped gap

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