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The Effect of Inlet Swirl on Brush Seal Bristle Deflections and Stability

Liu, Yuxin, Chew, John W., Pekris, Michael J. and Kong, Xiaozhi (2019) The Effect of Inlet Swirl on Brush Seal Bristle Deflections and Stability In: Turbo Expo 2019: Turbomachinery Technical Conference & Exposition, 17-21 Jun 2019, Phoenix Convention Center, Phoenix, AZ, USA.

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This paper considers 3D CFD and structural modelling of brush seals, and investigates the effects of inlet swirl on the bristle pack. The model couples aerodynamic forces generated by CFD to a structural model that includes interaction between bristles. At a critical value of inlet swirl, aerodynamic forces cause circumferential slip of the upstream bristle row. In practice this may lead to instability of the bristle pack and is consistent with anecdotal reports of seal behavior. The critical swirl velocity was reduced when the downstream pressure level was raised, keeping the same upstream total to downstream static pressure difference. This is caused by the increased dynamic head associated with the inlet swirl. Inclusion of a front plate in the seal design does not offer the intended protection to the bristle pack in highly swirling environments. This is associated with highly swirling flow impinging on the bristle tips. Fitting of roughness elements on the upstream face of the front plate could improve stability by reducing swirl of the flow impacting on the bristles. Increasing the bristle diameter and bristle stiffness does not necessarily prevent slip at higher inlet swirl velocities, but reduces the magnitude of slip of the upstream bristles.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Liu, Yuxin
Chew, John
Pekris, Michael
Kong, Xiaozhi
Date : 17 June 2019
Copyright Disclaimer : Copyright © 2019 by ASME
Uncontrolled Keywords : Brush seals; Coupled model; Bristle bending; Inlet swirl; Bristle stability
Related URLs :
Depositing User : Diane Maxfield
Date Deposited : 06 Jun 2019 15:24
Last Modified : 06 Sep 2019 09:35

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