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TECHNICAL PAPERS

Effects of Geometry on Brush Seal Pressure and Flow Fields—Part II: Backing Plate Configurations

[+] Author and Article Information
Yahya Dogu1

Department of Mechanical Engineering, Kirikkale University, Yahsihan, Kirikkale 71451, Turkeyydogu@kku.edu.tr

Mahmut F. Aksit

Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkeyaksit@sabanciuniv.edu

1

To whom correspondence should be addressed.

J. Turbomach 128(2), 379-389 (Jul 15, 2005) (11 pages) doi:10.1115/1.2101858 History: Received January 14, 2005; Revised July 15, 2005

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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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of brush seal

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Figure 2

Backing plate configurations

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Figure 3

Leakage evaluation for backing plate configurations

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Figure 4

Pressure (kPa) for contact operation

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Figure 5

Velocity vectors (m/s) for contact operation

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Figure 6

Radial velocity (m/s) for contact operation

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Figure 7

Axial velocity (m/s) for contact operation

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Figure 8

Turbulent kinetic energy (m2∕s2) for contact operation

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Figure 9

Pressure (kPa) for clearance operation

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Figure 10

Velocity vectors (m/s) for clearance operation

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Figure 11

Radial velocity (m/s) for clearance operation

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Figure 12

Axial velocity (m/s) for clearance operation

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Figure 13

Turbulent kinetic energy (m2∕s2) for clearance operation

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Figure 14

Flow properties on backing plate: (a) pressure, (b) radial velocity, (c) axial velocity, and (d) turbulent kinetic energy

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