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research-article

The influence of an upstream pylon on open rotor aerodynamics at angle of attack

[+] Author and Article Information
Nishad G. Sohoni

Research Associate, Whittle Laboratory, University of Cambridge, UK
ns451@cantab.net

Cesare A. Hall

Senior Lecturer, Whittle Laboratory, University of Cambridge, UK
cah1003@cam.ac.uk

Anthony B Parry

Consultant, University of Southampton, UK
A.Parry@soton.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041082 History: Received March 06, 2018; Revised July 19, 2018

Abstract

The aerodynamic impact of installing a horizontal pylon in front of a contra-rotating open rotor engine, at take-off, was studied. Thee unsteady interactions of the pylon's wake and potential field with the rotor blades were predicted by full-annulus URANS CFD calculations at 0° and 12° angle of attack (AoA). Two pylon configurations were studied: one where the front rotor blades move down behind the pylon (DBP), and one where they move up behind the pylon (UBP). When operating at 12° AoA, the UBP orientation was shown to reduce the rear rotor tip vortex sizes and separated flow regions, whereas the front rotor wake and vortex sizes were increased. In contrast, the DBP orientation was found to reduce the incidence variations onto the front rotor, leading to smaller wakes and vortices. The engine flow was also time-averaged, and the variation in work done on average mid-span streamlines was shown to depend strongly on variation in incidence, along with a smaller contribution related to change of radius.

Copyright (c) 2018 by ASME
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