TY - GEN
T1 - Effects of Varying Separation Distance on the Acoustics and Performance of Counter-Rotating Coaxial Rotors
AU - McThane, Eric
AU - Raja Zahirudin, Raja Akif
AU - Hafner, Aaron
AU - Greenwood, Eric
AU - Palacios, Jose
N1 - Publisher Copyright:
© 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2023-4292
DO - 10.2514/6.2023-4292
M3 - Conference contribution
AN - SCOPUS:85196703702
SN - 9781624107047
T3 - AIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023
BT - AIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023
Y2 - 12 June 2023 through 16 June 2023
ER -