Novel approach to helicopter brownout based on vortex and discrete element methods

Tan, J. F., Gao, J. e., Barakos, G. N. , Lin, C. L., Zhang, W. G. and Huang, M. Q. (2021) Novel approach to helicopter brownout based on vortex and discrete element methods. Aerospace Science and Technology, 116, 106839. (doi: 10.1016/j.ast.2021.106839)

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Abstract

So far, numerical methods used for brownout considered empirical and semi-empirical models, but particle-particle and particle-surface interactions were not extensively researched. In this work, a novel approach to helicopter brownout coupling a vortex method and a discrete element method is developed. In this approach, the dynamics of individual sand particles, the particle-particle and particle-surface interactions are directly computed and coupled with the flow field of a helicopter in ground effect through aerodynamic forces. The method is demonstrated for a scaled rotor of 172 mm diameter in ground effect, as well as for the US Army EH-60L in brownout. The results show that the predicted radial velocity profiles and wall jet compare well with experiments and published CFD results, and the predicted behavior of brownout agrees with observations from flight tests of the EH-60L. Compared with Lagrangian dust cloud simulation, the predicted relative error of dust cloud is reduced by 57.09% in the taxi-pass case and 28.76% in the approach-to-touchdown case.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George
Authors: Tan, J. F., Gao, J. e., Barakos, G. N., Lin, C. L., Zhang, W. G., and Huang, M. Q.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Aerospace Science and Technology
Publisher:Elsevier
ISSN:1270-9638
ISSN (Online):1626-3219
Published Online:27 May 2021
Copyright Holders:Copyright © 2021 Elsevier Masson SAS
First Published:First published in Aerospace Science and Technology 116: 106839
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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