A computational study of helicopter rotorwakes and noise generated during transient maneuvers

Hsuan Nien Chen, Shreyas Ananthan, Gordon Leishman, Kenneth S. Brentner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A study of three types of flight maneuvers, namely arrested descent, turns, and roll-reversal maneuvers, were examined using a rotorcraft aeroacoustics prediction model. The components of the model comprised a utility helicopter flight dynamic model, a time-accurate freevortex rotor wake model, and a maneuvering rotor noise prediction code. All rotorcraft motions and rigid body blade motions were included in the respective models. The rotor wake geometry and its development during the various flight maneuvers is described. In a transient maneuver, the rotor wake behavior is shown to be relatively complicated and in some cases the tip-vortices "bundle" together. The interaction of the tip vortices with the rotor blades creates a significant increase in levels of the impulsive noise, but primarily when the interaction of the nearly parallel to the blade. When a "bundle" of tip vortices interacts with the rotor in a near-parallel interaction, a very large increase in impulsive noise is observed over a very large region under the rotor.

Original languageEnglish (US)
Title of host publication61st Annual Forum Proceedings - AHS International
Pages37-62
Number of pages26
StatePublished - Dec 1 2005
Event61st American Helicopter Society International Annual Forum 2005 - Grapevine, TX, United States
Duration: Jun 1 2005Jun 3 2005

Publication series

NameAnnual Forum Proceedings - AHS International
Volume1
ISSN (Print)1552-2938

Other

Other61st American Helicopter Society International Annual Forum 2005
CountryUnited States
CityGrapevine, TX
Period6/1/056/3/05

Fingerprint

Helicopters
Rotors
Vortex flow
Impulse noise
Aeroacoustics
Flight dynamics
Turbomachine blades
Dynamic models
Geometry

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, H. N., Ananthan, S., Leishman, G., & Brentner, K. S. (2005). A computational study of helicopter rotorwakes and noise generated during transient maneuvers. In 61st Annual Forum Proceedings - AHS International (pp. 37-62). (Annual Forum Proceedings - AHS International; Vol. 1).
Chen, Hsuan Nien ; Ananthan, Shreyas ; Leishman, Gordon ; Brentner, Kenneth S. / A computational study of helicopter rotorwakes and noise generated during transient maneuvers. 61st Annual Forum Proceedings - AHS International. 2005. pp. 37-62 (Annual Forum Proceedings - AHS International).
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Chen, HN, Ananthan, S, Leishman, G & Brentner, KS 2005, A computational study of helicopter rotorwakes and noise generated during transient maneuvers. in 61st Annual Forum Proceedings - AHS International. Annual Forum Proceedings - AHS International, vol. 1, pp. 37-62, 61st American Helicopter Society International Annual Forum 2005, Grapevine, TX, United States, 6/1/05.

A computational study of helicopter rotorwakes and noise generated during transient maneuvers. / Chen, Hsuan Nien; Ananthan, Shreyas; Leishman, Gordon; Brentner, Kenneth S.

61st Annual Forum Proceedings - AHS International. 2005. p. 37-62 (Annual Forum Proceedings - AHS International; Vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Chen HN, Ananthan S, Leishman G, Brentner KS. A computational study of helicopter rotorwakes and noise generated during transient maneuvers. In 61st Annual Forum Proceedings - AHS International. 2005. p. 37-62. (Annual Forum Proceedings - AHS International).