Performance and wake analysis of rotors in axial flight using computational fluid dynamics

Nik Mohd, N. A. R. and Barakos, G. (2017) Performance and wake analysis of rotors in axial flight using computational fluid dynamics. Journal of Aerospace Technology and Management, 9(2), pp. 193-202. (doi:10.5028/jatm.v9i2.623)

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Abstract

Flow field around rotors in axial flight is known to be complex especially in steep descent where the rotor is operating inside its own wake. It is often reported that, in this flight condition, the rotor is susceptible to severe wake interactions causing unsteady blade load, severe vibration, loss of performance, as well as poor control and handling. So far, there is little data from experimental and numerical analysis available for rotors in axial flight. In this paper, the steady Reynolds-Averaged Navier-Stokes Computational Fluid Dynamics solver Helicopter Multi-Block was used to predict the performance of rotors in axial flight. The main objective of this study was to improve the basic knowledge about the subject and to validate the flow solver used. The results obtained are presented in the form of surface pressure, rotor performance parameters, and vortex wake trajectories. The detailed velocity field of the tip vortex for a rotor in hover was also investigated, and a strong self-similarity of the swirl velocity profile was found. The predicted results obtained when compared with available experimental data showed a reasonably agreement for hover and descent rate, suggesting unsteady solution for rotors in vortex-ring state.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George
Authors: Nik Mohd, N. A. R., and Barakos, G.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Journal of Aerospace Technology and Management
Publisher:Institute of Aeronautics and Space
ISSN:1984-9648
ISSN (Online):2175-9146
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Journal of Aerospace Technology and Management 9(2):193-202
Publisher Policy:Reproduced under a Creative Commons License

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