Brush seal dynamic behavior is strongly related to pressure and flow fields. Developments in brush seal design have led to geometric modifications to control flow field and consequent brush seal issues including blow-down, hang-up, and pressure stiffening. Some of the geometric enhancements have been found to have common use as backing plate modifications. Over the two decades of brush seal evolution, many backing plate configurations have been suggested in numerous patent disclosures. Even so, literature on the effects of geometric modifications on pressure and flow fields remains limited. This study numerically investigates brush seal pressure and flow fields for such common conceptual backing plate configurations as single and multiple grooves, with and without by-pass passages. The CFD analysis presented employs a bulk porous medium approach for the bristle pack. The effectiveness of various backing plate configurations outlining important flow features is discussed. Results indicate that backing plate configurations have a decisive role in shaping seal pressure fields. In general, it has been found that all cases having bypass configuration leak more. Moreover, the major portion of the seal leakage through fence height is fed from the backing plate cavity. The single backing plate groove forms a constant pressure behind the bristle pack. In contrast, multiple grooves form multiple constant pressure regions.
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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 II: Backing 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): 379-389 (11 pages)
Published Online: July 15, 2005
Article history
Received:
January 14, 2005
Revised:
July 15, 2005
Connected Content
This is a correction to:
Effects of Geometry on Brush Seal Pressure and Flow Fields—Part I: Front Plate Configurations
Citation
Dogu, Y., and Aksit, M. F. (July 15, 2005). "Effects of Geometry on Brush Seal Pressure and Flow Fields—Part II: Backing Plate Configurations." ASME. J. Turbomach. April 2006; 128(2): 379–389. https://doi.org/10.1115/1.2101858
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