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research-article

Identifying Opportunities for Reducing Nacelle Drag

[+] Author and Article Information
Maverick Zawislak

Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, K7L 3N6, Canada
maverick.zawislak@queensu.ca

David Cerantola

Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, K7L 3N6, Canada
david.cerantola@queensu.ca

Michael Birk

Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, K7L 3N6, Canada
birk@me.queensu.ca

1Corresponding author.

ASME doi:10.1115/1.4037864 History: Received July 12, 2017; Revised July 20, 2017

Abstract

The accurate prediction of drag caused by bluff bodies present in aerospace applications, particularly at high angles of attack, was a challenge. An experimental and numerical investigation of a nacelle intended for fuselage-mounted aircraft engines was completed at several angles of attack between 0 and 45 deg with a Reynolds number of 6e5. Steady-flow simulations were conducted on hybrid grids using ANSYS Fluent 15.0 with preference given to the realizable k-epsilon turbulence model. Both total drag and the pressure-to-viscous drag ratio increased with angle of attack as a consequence of greater flow separation on the suction surface. Near-field and far-field drag predictions had grid uncertainties below 2.5% and were within 10% of experiment, which were less than the uncertainties of the respective force balance and outlet traverse data at all angles of attack. Regions were defined on suction-side x-pressure force plots using the validated CFD data-set that showed where and how much drag could be reduced. At 20 deg angle of attack, there was potential to reduce up to 20% drag contained within the separated flow region.

Copyright (c) 2017 by ASME
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