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Effect of Variations in Shroud Geometry on Single Phase Flow Over a Shrouded Single Spiral Gear

[+] Author Affiliations
Steve Rapley, Carol Eastwick, Kathy Simmons

University of Nottingham, Nottingham, UK

Paper No. GT2008-50633, pp. 1483-1492; 10 pages
doi:10.1115/GT2008-50633
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

In some aero-engine applications a spiral bevel gear is mounted in a bearing chamber. A gear can be separated from the surrounding chamber by the use of a shroud (a close fitting cover) to reduce the parasitic windage power loss due to the drag on the gear caused by the surrounding fluid. In this paper a single-phase computational study of the effect of variations in shroud geometry on the single phase flow over a shrouded single spiral bevel gear is presented, with a baseline case compared to available experimental data. The aim of the work is to identify good working practice in designing shrouds. The work is a continuation of work reported in ASME Turbo 2007 [1]. In the parametric study three variables have been identified as controlling the shroud behaviour and these are the clearances at shroud inlet, outlet and between shroud and teeth. Clearances at these three locations have been varied between less than 1mm (smaller than would typically be found in an aeroengine) and 4mm (wider than generally found). Varying the shroud geometry is shown to affect the flow structure, causing transience and different flow paths/recirculations within the flow. This affects the windage power loss experienced by the gear. The effects of different shroud geometries on the flow is analysed and presented within the paper. For a given rotational speed, changing the shroud geometry is seen to cause a variation in torque levels of up to 50% (comparing best and worst cases). The possibility of directional bias in the flow structure and torque levels is investigated. Static pressure profiles on the shroud for the baseline case are compared with experimental data and reasonable agreement is shown.

Copyright © 2008 by ASME

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