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Modelling the interaction of helicopter main rotor and tail rotor wakes

Published online by Cambridge University Press:  03 February 2016

T. M. Fletcher and
R. E. Brown
T. M. Fletcher
Affiliation:
Department of Aeronautics, Imperial College, London, UK
R. E. Brown
Affiliation:
Department of Aerospace Engineering, University of Glasgow, Glasgow, UK
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Abstract

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The mutual interaction between the main rotor and tail rotor wakes is central to some of the most problematic dynamic phenomena experienced by helicopters. Yet achieving the ability to model the growth and propagation of helicopter rotor wakes with sufficient realism to capture the details of this interaction has been a significant challenge to rotorcraft aerodynamicists for many decades. A novel computational fluid dynamics code tailored specifically for rotorcraft applications, the vorticity transport model, has been used to simulate the interaction of the rotors of a helicopter with a single main rotor and tail rotor in both hover and low-speed quartering flight, and with the tail rotor rotating both top-forward and top-aft. The simulations indicate a significant level of unsteadiness in the performance of both main and tail rotors, especially in quartering flight, and a sensitivity to the direction of rotation of the tail rotor. Although the model thus captures behaviour that is similar to that observed in practice, the challenge still remains to integrate the information from high fidelity simulations such as these into routine calculations of the flight dynamics of helicopters.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 111 , Issue 1124 , October 2007, pp. 637 - 643
Copyright
Copyright © Royal Aeronautical Society 2007 

References

1. Peters, D.A., Boyd, D.D. and He, C.J.. Finite-state induced-flow Model for rotors in hover and forward flight, J American Helicopter Soc, October 1989, 34, (4), pp 5–17.Google Scholar
2. Johnston, J.F. and Cook, J.R.. AH-56A vehicle development, 1971, American Helicopter Society 27th Annual Forum Proceedings, Washington DC, USA.Google Scholar
3. Amer, K.B., Prouty, R.W., Walton, R.P. and Engle, J.E.. Handling qualities of army/Hughes YAH-64 advanced attack helicopter, 1978, American Helicopter Society 34th Annual Forum Proceedings, Washington, DC, USA, pp 78.31.1-78.31.17.Google Scholar
4. Lynn, R.R., Robinson, F.D., Batra, N.N. and Duhon, J.M.. Tail rotor design Part 1: Aerodynamics, J American Helicopter Soc, October 1970, 15, (4), pp 2–15.Google Scholar
5. Leverton, J.W., Pollard, J.S. and Willis, C.R.. Main rotor-wake/tail rotor interaction, Vertica, 1997, 1, (3), pp 213–224.Google Scholar
6. Sheridan, P.F. and Smith, R.P.. Interactional aerodynamics – A new challenge to helicopter technology, J American Helicopter Soc, January 1980, 25, (1), pp 3–21.Google Scholar
7. Brown, R.E.. Rotor wake modelling for flight dynamic simulation of helicopters, AIAA J, January 2000, 38, (1), pp 57–63.Google Scholar
8. Brown, R.E. and Line, A.J.. Efficient high-resolution wake modelling using the vorticity transport equation, AIAA J, July 2005, 43, (7), pp 1434–1443.Google Scholar
9. Brown, R.E. and Houston, S.S.. Comparison of induced velocity models for helicopter flight mechanics, J Aircr, July 2000, 37, (4), pp 623–629.Google Scholar
10. Houston, S.S. and Brown, R.E.. Rotor-wake modeling for simulation of helicopter flight mechanics in autorotation, J Aircr, September 2003, 40, (5), pp 938–945.Google Scholar
11. Kenyon, A.R. and Brown, R.E.. Wake dynamics and rotor-fuselage aerodynamic interactions, 2007, American Helicopter Society 63rd Annual Forum Proceedings, Virginia Beach, USA, 1-3 May, 2007.Google Scholar
12. Fletcher, T.M. and Brown, R.E.. Main rotor – tail rotor wake interaction and its implications for helicopter directional control, September 2006, 32nd European Rotorcraft Forum Proceedings, Maastricht, The Netherlands, 12-14 September, 2006.Google Scholar