Pressure and flow fields lay at the basis of such common phenomena affecting brush seal performance as bristle flutter, blow-down, hang-up, hysteresis, pressure stiffening, wear, and leakage. Over the past two decades of brush seal evolution, manufacturers and researchers have applied many geometric configurations to the front and backing plates of a standard brush seal in order to control the flow field and consequent seal performance. The number of studies evaluating the effect of geometric configurations on the brush seal flow field remains limited in spite of the high number of filed patent disclosures. This study presents a numerical analysis of brush seal pressure and flow fields with regard to common conceptual front plate configurations. A CFD model has been employed to calculate pressure and flow fields in the seal domain. The model incorporates a bulk porous medium approach for the bristle pack. The effectiveness of various conceptual geometries has been outlined in terms of flow field formation. Results disclose unique effects of geometry on pressure and flow fields such that a longer front plate drives outward radial flow while playing a protective role against upstream cavity disturbances. Findings also indicate that variations in front plate geometry do not directly affect leakage performance. A long front plate or damper shim considerably changes the flow field while at the same time having limited effect on the pressure field. Moreover, a strong suction towards the clearance enhances inward radial flow in clearance operation.
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e-mail: ydogu@kku.edu.tr
e-mail: aksit@sabanciuniv.edu
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April 2006
Technical Papers
Effects of Geometry on Brush Seal Pressure and Flow Fields—Part I: Front Plate Configurations
Yahya Dogu,
Yahya Dogu
Department of Mechanical Engineering,
e-mail: ydogu@kku.edu.tr
Kirikkale University
, Yahsihan, Kirikkale 71451, Turkey
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Mahmut F. Aksit
Mahmut F. Aksit
Faculty of Engineering and Natural Sciences,
e-mail: aksit@sabanciuniv.edu
Sabanci University
, Tuzla, Istanbul 34956, Turkey
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Yahya Dogu
Department of Mechanical Engineering,
Kirikkale University
, Yahsihan, Kirikkale 71451, Turkeye-mail: ydogu@kku.edu.tr
Mahmut F. Aksit
Faculty of Engineering and Natural Sciences,
Sabanci University
, Tuzla, Istanbul 34956, Turkeye-mail: aksit@sabanciuniv.edu
J. Turbomach. Apr 2006, 128(2): 367-378 (12 pages)
Published Online: July 15, 2005
Article history
Received:
January 14, 2005
Revised:
July 15, 2005
Connected Content
A correction has been published:
Effects of Geometry on Brush Seal Pressure and Flow Fields—Part II: Backing Plate Configurations
Citation
Dogu, Y., and Aksit, M. F. (July 15, 2005). "Effects of Geometry on Brush Seal Pressure and Flow Fields—Part I: Front Plate Configurations." ASME. J. Turbomach. April 2006; 128(2): 367–378. https://doi.org/10.1115/1.2101857
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