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Performance model of a very high bypass ratio counter rotating turbo fan engine
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Nowadays Snecma focuses on new engine architectures in order to meet the future demands in civil aviation. One of these considered concepts is aircrafts powered by counter rotating fan engines which aim at tackling both noise and polluting emissions. A powerful way to reduce the perceived noise is to reduce the fan rotating speeds, which requires to lower fan pressure ratio.

This thesis continues a study on an innovative counter rotating fan architecture carried out by Snecma from 2005 to 2010 for VITAL (European Commission funded project). It is a way to meet the noise target while maintaining acceptable engine dimensions and matching installation constraints since each fan has a smaller diameter than the current ones, and an individual low pressure ratio. Therefore the drag is decreased and less fuel is burnt.

In order to fulfill these ambitious objectives, the first step of this thesis is to use the code of the VITAL model developed with Janus (Snecma in-house code) in order to create a new code for the PROOSIS software. When modeling two counter rotating fans, the key point is to take into account the influence from the first stage on the second one.  Since the aft fan “sees” a perturbed flow by the inlet fan wake, its characteristic map is not the usual one anymore. One major challenge was the new design of a two separated flow and three-spool counter rotating engine driven by a gearbox which meets the very high bypass ratio target. The model finally turned out to be operational for a relevant set of initialization parameters and thus makes now possible more accurate studies on counter rotating turbofan engines in the R&T unit.

Place, publisher, year, edition, pages
2012. , 6 p.
Keyword [en]
Performance engine counter rotating CRTF three-spool snecma gearbox
National Category
Aerospace Engineering
URN: urn:nbn:se:kth:diva-92126OAI: diva2:512244
Subject / course
Thermal Engineering
Educational program
Master of Science in Engineering - Vehicle Engineering
2012-03-20, SNECMA - Etablissement de Villaroche sud Rond point René Ravaud - Réau, 77550 MOISSY-CRAMAYEL CEDEX FRANCE, 09:30 (English)
Available from: 2013-06-24 Created: 2012-03-27 Last updated: 2013-06-24Bibliographically approved

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