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Experimental Investigation and Mathematical Modelling of Clearance Brush Seals
journal contribution
posted on 2023-06-07, 22:22 authored by M T Turner, J W Chew, Christopher LongIn this paper an experimental programme and a CFD based mathematical model using a brush seal at two bristle to rotor clearances (0,27 mm. and 0,75 mm.), are presented. The experimental programme examined the radial pressure distributions along the backing ring, the axial pressure distribution along the rotor, and the mass flow through the seal, through a range of pressure ratios while exhausting to atmosphere. The results from this experimental programme have been used to further calibrate a CFD based model. This model treats the bristle pack as an axisymmetric, anisotropic porous region, and is calibrated by the definition of non-linear resistance coefficients in three orthogonal directions. The CFD analysis calculates the aerodynamic forces on the bristles, which are subsequently used in a separate program to estimate the bristle movements, stresses and bristle and rotor loads. The analysis shows that a brush seal with a build clearance produces a very different flow field within the bristle pack to one with an interference, and the need to understand the bulk movements of the bristles. These are shown to be affected by the level of friction between the bristles and the backing ring, which has an important effect on the bristles wear and seal leakage characteristics.
History
Publication status
- Published
Journal
Journal of Engineering for Gas Turbines and PowerISSN
0742-4795Publisher
American Society of Mechanical EngineersExternal DOI
Issue
3Volume
120Page range
573-579Event name
ASME Journal of Engineering for Gas Turbines & PowerEvent location
Orlando, FL, USA; 2 June 1997 through 5 June 1997Event type
conferenceISBN
0742-4795Department affiliated with
- Engineering and Design Publications
Notes
Also presented at ASME Journal of Engineering for Gas Turbines & Power: Orlando, FL, USA; 2 June 1997 through 5 June 1997Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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