Influence of transient flight maneuvers on rotor wake dynamics and noise radiation

Christopher C. Hennes, Hsuan Nien Chen, Kenneth S. Brentner, Shreyas Ananthan, Gordon G. Leishman

Research output: Contribution to conferencePaper

20 Scopus citations

Abstract

This paper presents a study of three flight maneuvers using a rotorcraft aeroacoustics model: "pop-up," "pop-down," and an arrested descent. A time-accurate free-vortex rotor wake model and a maneuvering rotor noise prediction code were used to compute the noise. All rotorcraft motions and rigid body blade motions were included in the respective models. The wake geometry and its development is described. It is shown that the magnitude and directivity of the noise is strongly dependent on the rotor wake characteristics when blade-vortex interactions occur. In the transient arrested descent maneuver, the wake geometry becomes extremely complicated, and a significant increase in both nonimpulsive and impulsive noise is predicted.

Original languageEnglish (US)
Pages607-624
Number of pages18
StatePublished - Jun 22 2004
EventAHS International Decennial Specialists' Conference on Aeromechnics - San Francisco, CA, United States
Duration: Jan 21 2004Jan 23 2004

Other

OtherAHS International Decennial Specialists' Conference on Aeromechnics
CountryUnited States
CitySan Francisco, CA
Period1/21/041/23/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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