Effects of Varying Separation Distance on the Acoustics and Performance of Counter-Rotating Coaxial Rotors

Eric McThane, Raja Akif Raja Zahirudin, Aaron Hafner, Eric Greenwood, Jose Palacios

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

1 Scopus citations

Abstract

The effects of varied separation distance and edgewise forward flight on the aerodynamic performance and acoustics of a small coaxial counter-rotating rotor system is investigated. A novel phase control software was utilized to maintain a 0◦ blade crossover location for acoustic consistency. As separation distance is increased from 0.2 rotor radii to 1.1 rotor radii, the higher harmonic tonal noise decreases. Conversely, the broadband noise increases with increasing separation distance. The peak frequency of the broadband noise also decreases as separation distance is increased. As the edgewise flight speed increases from hover to 10 m/s, the total system efficiency decreases. Both the upper and lower rotor are affected over this speed range. Both higher harmonic tonal noise and broadband noise are also found to increase with increasing flight speed.

Original languageEnglish (US)
Title of host publicationAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624107047
DOIs
StatePublished - 2023
EventAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023 - San Diego, United States
Duration: Jun 12 2023Jun 16 2023

Publication series

NameAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023

Conference

ConferenceAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023
Country/TerritoryUnited States
CitySan Diego
Period6/12/236/16/23

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Aerospace Engineering

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