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Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight

Fletcher, Timothy M. and Brown, Richard (2010) Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight. Journal of Aircraft, 47 (6). pp. 2136-2148. ISSN 0021-8669

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Abstract

The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor system translating at a sideslip angle that causes the tail rotor to interact with the main rotor tip vortices as they propagate downstream at the lateral extremities of the wake. The tail rotor is shown to exhibit a distinct directionally dependent mode during which tail rotors that are configured so that the blades travel forward at the top of the disk develop less thrust than tail rotors with the reverse sense of rotation. The range of flight speeds over which this mode exists is shown to vary considerably with the vertical location of the tail rotor. At low flight speeds, the directionally dependent mode occurs because the tail rotor is immersed within not only the downwash from the main rotor but also the rotational flow associated with clusters of largely disorganized vorticity within the main rotor wake. At higher flight speeds, however, the tail rotor is immersed within a coherent supervortex that strongly influences the velocity field surrounding the tail rotor.

Item type: Article
ID code: 30520
Notes: Authors own copyright to this paper
Keywords: helicopters, airctaft, tail rotor, velocity, Mechanical engineering and machinery, Motor vehicles. Aeronautics. Astronautics, Mechanical Engineering, Aerospace Engineering, Control and Systems Engineering, Computational Mechanics
Subjects: Technology > Mechanical engineering and machinery
Technology > Motor vehicles. Aeronautics. Astronautics
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Pure Administrator
Date Deposited: 21 Apr 2011 04:10
Last modified: 17 Jun 2015 17:13
URI: http://strathprints.strath.ac.uk/id/eprint/30520

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