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Blade twist effects on rotor behaviour in the vortex ring state

Blade twist effects on rotor behaviour in the vortex ring state
Blade twist effects on rotor behaviour in the vortex ring state
Results are shown that give a better understanding of the factors that influence the initiation and subsequent development of the vortex ring state (VRS). It is suggested that the onset of VRS is associated with the collapse of the orderly structure of the rotor wake into a highly disturbed, irregular, aperiodic flow state. An analysis of the stability of the wake is presented to show that the location of the boundary of the VRS is influenced by the detailed structure of the rotor wake prior to its breakdown. Time-accurate calculations of the evolution of the rotor wake in the VRS are then presented to obtain more insight into the flows experienced by the rotor in the VRS. These calculations suggest that the location of the boundary of the VRS, and the depth of the VRS regime, is sensitive to the blade spanwise loading distribution, which is influenced by blade twist. The effects are significant even at low disk loading, but at high thrust where rotor stall may be encountered, rotors with and without significant blade twist show marked, and somewhat counterintuitive, differences in their behaviour under VRS conditions.
Brown, R.E.
19550fe7-3651-48c7-a468-446a818343a3
Newman, S.J.
802c97ed-ea28-477f-8b1e-8e4f873c4281
Perry, F.J.
a13d6b7e-8d78-45c3-96b8-b3e8778f45ff
Leishman, J.G.
e500a5e4-5b2f-4a24-a402-0e93328ec0d2
Brown, R.E.
19550fe7-3651-48c7-a468-446a818343a3
Newman, S.J.
802c97ed-ea28-477f-8b1e-8e4f873c4281
Perry, F.J.
a13d6b7e-8d78-45c3-96b8-b3e8778f45ff
Leishman, J.G.
e500a5e4-5b2f-4a24-a402-0e93328ec0d2

Brown, R.E., Newman, S.J., Perry, F.J. and Leishman, J.G. (2002) Blade twist effects on rotor behaviour in the vortex ring state. 28th European Rotorcraft Forum, Bristol, UK. 16 - 19 Sep 2002. 14 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Results are shown that give a better understanding of the factors that influence the initiation and subsequent development of the vortex ring state (VRS). It is suggested that the onset of VRS is associated with the collapse of the orderly structure of the rotor wake into a highly disturbed, irregular, aperiodic flow state. An analysis of the stability of the wake is presented to show that the location of the boundary of the VRS is influenced by the detailed structure of the rotor wake prior to its breakdown. Time-accurate calculations of the evolution of the rotor wake in the VRS are then presented to obtain more insight into the flows experienced by the rotor in the VRS. These calculations suggest that the location of the boundary of the VRS, and the depth of the VRS regime, is sensitive to the blade spanwise loading distribution, which is influenced by blade twist. The effects are significant even at low disk loading, but at high thrust where rotor stall may be encountered, rotors with and without significant blade twist show marked, and somewhat counterintuitive, differences in their behaviour under VRS conditions.

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More information

Published date: 2002
Additional Information: Paper 76
Venue - Dates: 28th European Rotorcraft Forum, Bristol, UK, 2002-09-16 - 2002-09-19

Identifiers

Local EPrints ID: 22087
URI: http://eprints.soton.ac.uk/id/eprint/22087
PURE UUID: 72624832-4cd5-431e-a6c7-327ed390ec58

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Date deposited: 05 Jun 2006
Last modified: 22 Jul 2020 16:41

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Contributors

Author: R.E. Brown
Author: S.J. Newman
Author: F.J. Perry
Author: J.G. Leishman

University divisions

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