0
research-article

FAN SIMILARITY MODEL FOR THE FAN-INTAKE INTERACTION PROBLEM

[+] Author and Article Information
Mauro Carnevale

Osney Thermo-Fluids Laboratory Department of Engineering Science, University of Oxford, Oxford OX2 0ES, UK
mauro.carnevale@eng.ox.ac.uk

Feng Wang

Osney Thermo-Fluids Laboratory Department of Engineering Science, University of Oxford, Oxford OX2 0ES, UK
feng.wang@eng.ox.ac.uk

Anthony B Parry

Rolls-Royce plc Derby, UK
anthony.parry@rolls-royce.com

Jeff Green

Rolls-Royce plc Derby, UK
jeff.green@Rolls-Royce.com

Luca di Mare

Osney Thermo-Fluids Laboratory Department of Engineering Science, University of Oxford, Oxford OX2 0ES, UK
luca.dimare@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4038247 History: Received July 11, 2017; Revised August 23, 2017

Abstract

Very high-bypass ratio turbofans with large fan tip diameter are an effective way of improving the propulsive efficiency of civil aero-engines. Such engines require larger and heavier nacelles, which partially offset any gains in SFC. This drawback is mitigated by adopting thinner walls for the nacelle and shortening the intake section. This bind the success of such technology to the problem of designing an intake with thin lips and short-diffuser section which is well matched to a low speed fan. Consequently the prediction of the mutual influence between the fan and the intake is crucial in the design process. Considerable effort has been devoted in recent years to the study of models for the effects of the fan on the lip stall characteristics and the operability of the whole installation. The study of such models is motivated by the wish to avoid the high costs of full three-dimensional CFD computations. This work documents a fan model for fan-intake computations based on the solution of the double linearization problem for unsteady, transonic flow past a cascade of aerofoils with finite mean load. The computation of the flow in the intake is reduced to a steady problem, whereas the computation of the flow in the fan is reduced to one steady problem and a set of solutions of the linearised model in the frequency domain. The model is applied to a well-documented test case and compares favourably with much more expensive three-dimensional, time domain computations.

Rolls-Royce plc
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In