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RESEARCH PAPERS: Gas Turbines: Heat Transfer

Influence of High Rotational Speeds on Heat Transfer and Oil Film Thickness in Aero-Engine Bearing Chambers

[+] Author and Article Information
S. Wittig, A. Glahn, J. Himmelsbach

Lehrstuhl und Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (T.H.), Karlsruhe, Federal Republic of Germany

J. Eng. Gas Turbines Power 116(2), 395-401 (Apr 01, 1994) (7 pages) doi:10.1115/1.2906833 History: Received March 03, 1993; Online April 24, 2008

Abstract

Increasing the thermal loading of bearing chambers in modern aero-engines requires advanced techniques for the determination of heat transfer characteristics. In the present study, film thickness and heat transfer measurements have been carried out for the complex two-phase oil/air flow in bearing chambers. In order to ensure real engine conditions, a new test facility has been built up, designed for rotational speeds up to n = 16,000 rpm and maximum flow temperatures of Tmax = 473 K. Sealing air and lubrication oil flow can be varied nearly in the whole range of aero-engine applications. Special interest is directed toward the development of an ultrasonic oil film thickness measuring technique, which can be used without any reaction on the flow inside the chamber. The determination of local heat transfer at the bearing chamber housing is based on a well-known temperature gradient method using surface temperature measurements and a finite element code to determine temperature distributions within the bearing chamber housing. The influence of high rotational speed on the local heat transfer and the oil film thickness is discussed.

Copyright © 1994 by The American Society of Mechanical Engineers
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