Combined Three-Dimensional Fluid Dynamics and Mechanical Modeling of Brush Seals

[+] Author and Article Information
Diego Lelli

Fluids Research Centre, University of Surrey, Guildford GU2 7XH, UKd.lelli@surrey.ac.uk

John W. Chew

Fluids Research Centre, University of Surrey, Guildford GU2 7XH, UKj.chew@surrey.ac.uk

Paul Cooper

 ALSTOM Power Limited, Newbold Road, Rugby Warwickshire, CV2 12NH, UK

J. Turbomach 128(1), 188-195 (Feb 01, 2005) (8 pages) doi:10.1115/1.2103093 History: Received October 01, 2004; Revised February 01, 2005

Development and application of a combined 3D computational fluid dynamics (CFD) and 3D bristle bending model for brush seals is described. The CFD model is created using commercial CFD mesh generation and solver software. A small gap is assumed between all bristles in the CFD model so as to avoid meshing problems at contact points and allow for imperfections in bristle geometry. The mechanical model is based on linear beam bending theory and allows large numbers of bristles to be modelled with arbitrary bristle-to-bristle contact and imported from the CFD solution. Deformed geometries may be exported directly to the mesh generation software, allowing iterative solution of the coupled aerodynamic/mechanical problem.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of a brush seal

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Figure 2

Fluid-structure iteration procedure

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Figure 3

Simple brush seal used in the present work showing the bristle numbers

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Figure 4

Mesh detail in the backing-ring end region (coarser mesh) for a deformed configuration; the figure shows the small gaps between the bristles

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Figure 5

Forces per unit length on the five bristles. ΔP=1bar.

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Figure 6

Relative pressure (Pa) contours on the periodic plane in the backing ring corner region

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Figure 7

Velocity vectors colored by the velocity magnitude (m∕s)

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Figure 8

Bristle centerline positions in the axial radial plane in the three iterative steps; the position of the BR is shown on top of the graph

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Figure 9

Contours of static pressure (Pa) near the overhanging region (a) 4 bar (b) 12 bar

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Figure 10

Aerodynamic forces from the CFD calculation with ΔP=12bar (a) circumferential forces (b) axial forces (c) radial forces

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Figure 11

Bristle deflections in the axial-radial plane (a) 4 bar (b) 7 bar (c) 12 bar

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Figure 12

Variation of torque with pressure difference across seal

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Figure 13

Large pack bristle tips. The dashed lines indicate the slipping planes in the pack; ---- initial position;—last position,—backing ring.



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