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Aerodynamic Optimisation of an Aeroengine Bypass Duct OGV-Pylon Configuration

[+] Author Affiliations
Thomas Tschirner, Michael Pfitzner, Rüdiger Merz

Rolls Royce Deutschland plc & Company KG, Dahlewitz, Germany

Paper No. GT2002-30493, pp. 879-888; 10 pages
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3610-X | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME


In a core-mounted high-bypass aero engine the fairing around the mount arm carrying the engine weight through the bypass duct has to be designed such that the aerodynamic losses induced by this thick structure are minimized to avoid an increase of specific fuel consumption. On the other hand, the overall engine length and weight needs to be kept to a minimum so that there is no negative impact on airplane payload. This paper describes the development of an automated 2-D CFD analysis procedure for fast investigation of aerodynamic losses generated in the fan outlet guide vanes (OGV’s) and the bypass duct by the introduction of a core mount arm. Design rules for the positioning and aerodynamic form of the mount arm fairing are presented. Different configurations are compared with respect to the pressure loss induced in the bypass duct and the additional contribution to fan back pressure. A combination of well adapted aerodynamic mount arm fairing and re-staggering of the struts is presented, which only marginally increases the overall total pressure loss in the bypass duct and has negligible effect on the fan backpressure distribution.

Copyright © 2002 by ASME
Topics: Optimization , Ducts



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