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Numerical Modelling of Three Dimensional Honeycomb Labyrinth Seals Employing a Simplified Approach

[+] Author Affiliations
Dermot Collins, Joao Amaral Teixeira

Cranfield University, Cranfield, Bedfordshire, UK

Pete Crudgington

Cross Manufacturing Company, Ltd., Devizes, Wiltshire, UK

Paul C. Ivey

University of Hertfordshire, Hatfield, UK

Paper No. GT2006-90850, pp. 1507-1518; 12 pages
doi:10.1115/GT2006-90850
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4238-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

This paper numerically analyses the flow through abradable honeycomb labyrinth seals using CFD. Three-dimensional CFD simulations using a single tooth have been compared to representative two-dimensional simulations. Two sizes of honeycomb (1.60mm and 3.20mm) have been analysed at pressure ratios from 1.20 up to 1.60. The seal geometry was kept constant throughout with a running clearance of 1.00mm. The honeycomb has been oriented in two planes with respect to the labyrinth teeth. The two-dimensional planes show equivalence both in terms of overall performance and inter-cavity pressure profiles. Comparisons of Cd typically agree within 2.5%, having an average variation of 1.3%. Total pressure profiles at the middle of the upstream and downstream cavity have been compared. These reveal typical average RMS variations of less than 3% between 3-D and 2-D profiles. It has also been shown that the honeycomb surface causes velocity effects in 3-D that propagate into the seal cavity. The technique used has achieved significant reductions in modelling times.

Copyright © 2006 by ASME
Topics: Modeling

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