High resolution computation of the aerodynamics and acoustics of blade vortex interaction

Thom, A. and Duraisamy, K. (2008) High resolution computation of the aerodynamics and acoustics of blade vortex interaction. In: 34th European Rotorcraft Forum, Liverpool, England, 16-19 Sept 2008,

Abstract

In the present work, high resolution CFD simulations have been performed on an idealised problem of the interaction of an independently generated vortex with a rotor blade, including a case where the vortex directly impacts on the blade. The resulting blade pressures and acoustics are comprehensively compared against experimental measurements. Two different modelling approaches are used: the first is to impose the vortex as a perturbation to the velocity field, and the second is to fully resolve the vortex formation, evolution and its interaction with the blade. For a case in which the vortex passes near the blade surface, the the fully resolved approach is confirmed to accurately preserve the vortex structure. The far field acoustic predictions offered by the fully resolved approach are seen to be very accurate and definite improvements are observed in the computed blade pressures and acoustics over the imposed vortex approach and other similar works in the literature. For a case in which the vortex axis passes through the blade, the shape and width of the acoustic pulse in the far field is accurately represented by the fully resolved approach, while the magnitude is slightly underpredicted. The improvement in prediction offered by the fully resolved approach is because this method allows for a more realistic representation of phenomena, such as dynamic change in vortex structure and trajectory due to the blade passage, that become important when the vortex miss-distance becomes small.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Duraisamy, Mr Karthikeyan
• Authors: Thom, A., and Duraisamy, K.
• Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Research Group: Rotor Aeromechanics
• Copyright Holders: Copyright © 2008 The Authors
• First Published: First published in Proceedings of the 34th European Rotorcraft Forum
• Publisher Policy: Reproduced with permission of the authors