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RESEARCH PAPERS: Gas Turbines: Heat Transfer

An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results

[+] Author and Article Information
L. H. Chen, P. E. Wood, T. V. Jones

Department of Engineering Science, University of Oxford, Parks Road, Oxford, United Kingdom

J. W. Chew

Mechanical Science Group, Rolls-Royce plc., Moor Lane, Derby, United Kingdom

J. Eng. Gas Turbines Power 121(4), 656-662 (Oct 01, 1999) (7 pages) doi:10.1115/1.2818522 History: Received March 22, 1998; Revised June 23, 1999; Online December 03, 2007

Abstract

The position of the bristles within a brush seal is dictated by the pressure distribution within the seal, which is itself influenced by the position of the bristle matrix. In order to predict mass flows, pressure capabilities, bristle displacements, stresses, and contact loads at the rotor interface, a technique for iterating between a CFD and a mechanical model has been developed. The iterative technique is used to model the behavior of seals with an initial build clearance, where the application of pressure causes a change in the position of the bristle matrix. Frictional effects between neighboring bristles and at the backing ring influence the behavior of the bristles and these are accounted for within the mechanical part of the model. Results are presented and discussed for seals of both initial build clearance and interference. The mathematical predictions for flow, contact loads at the rotor interface, and the nature of the bristles displacements are compared with experimental results.

Copyright © 1999 by The American Society of Mechanical Engineers
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