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Computational Investigation of the Airflow Through a Shrouded Bevel Gear

[+] Author Affiliations
Mark Farrall, Kathy Simmons, Stephen Hibberd

University of Nottingham, Nottingham, UK

Colin Young

Rolls-Royce plc, Derby, UK

Paper No. GT2005-68879, pp. 1259-1265; 7 pages
doi:10.1115/GT2005-68879
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 3: Turbo Expo 2005, Parts A and B
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4726-8 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

Bevel gear systems are used in aero-engines to transmit power from the main drive shaft to the auxiliary systems. Friction between the rotating gear and the surrounding air increases turbulence and heat generation, and has been reported to account for as much as 10% of the total losses in a gear system. Potential savings in losses may result from enclosing the gear with a shroud, or restricting the flow through the teeth using an inlet dam. Numerical simulations of the airflow around a crown bevel gear running in isolation are presented for a shaft speed of 15000 rpm. The results are used to gain an insight into the flow patterns that exist and the changes that occur with the introduction of an inlet dam or shroud. Three face clearances are studied for the shroud with the results indicating that, decreasing the face clearance decreases the windage loss towards an optimal value. Smaller face clearances than this optimum result in increased windage loss.

Copyright © 2005 by ASME
Topics: Air flow , Gears

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