A Combined Experimental and Theoretical Study of Flow and Pressure Distributions in a Brush Seal

[+] Author and Article Information
F. J. Bayley, C. A. Long

Thermo-Fluid Mechanics Research Centre, School of Engineering, University of Sussex, Brighton, BN1 9QT, Sussex, United Kingdom

J. Eng. Gas Turbines Power 115(2), 404-410 (Apr 01, 1993) (7 pages) doi:10.1115/1.2906723 History: Received February 24, 1992; Online April 24, 2008


A relatively simple theory is presented that can be used to model the flow and pressure distribution in a brush seal matrix. The model assumes laminar, compressible, isothermal flow and requires knowledge of an empirical constant: the seal porosity value. Measurements of the mass flow rate together with radial and axial distributions of pressure were taken on a nonrotating experimental rig. These were obtained using a 122 mm bore brush seal with 0.25 mm radial interference. The experimental data are used to estimate the seal porosity. Measurements of the pressure distributions along the backing ring and under the bristle tips and discussed. Predicted mass flows are compared with those actually measured and there is reasonable agreement considering the limitations of the model.

Copyright © 1993 by The American Society of Mechanical Engineers
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