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RESEARCH PAPERS: Gas Turbines: Heat Transfer

Two-Phase Air/Oil Flow in Aero Engine Bearing Chambers: Characterization of Oil Film Flows

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

Lehrstuhl und Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (T.H.), 76128 Karlsruhe, Federal Republic of Germany

J. Eng. Gas Turbines Power 118(3), 578-583 (Jul 01, 1996) (6 pages) doi:10.1115/1.2816687 History: Received February 16, 1995; Online November 19, 2007

Abstract

For the design of secondary air and lubrication oil systems, a sufficient knowledge of two-phase flow and heat transfer phenomena under bearing chamber flow conditions is required. The characterization of oil film flows at the bearing chamber walls is one of the major tasks for a better understanding of these processes and, therefore, a necessity for improvements of the efficiency of aero engines. The present paper gives a contribution to this subject. Utilizing a fiber-optic LDV setup, measurements of oil film velocity profiles have been performed in our high-speed bearing chamber rig simulating real engine conditions. All data have been compared with different theoretical approaches, which have been derived from a force balance at a liquid film element, including geometric conditions and temperature dependent fluid properties, and by approaches for the eddy viscosity available in the literature.

Copyright © 1996 by The American Society of Mechanical Engineers
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