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Aeroacoustic Prediction and Validation of Variable RPM Rotors and Rotor-Airframe Interactions for Advanced Air Mobility Applications

Mrunali Botre, Daniel Wachspress, Continuum Dynamics Inc.
Kenneth Brentner, Ze Feng Ted Gan, Pennsylvania State University

May 10, 2022

https://doi.org/10.4050/F-0078-2022-17430

Abstract:
Aeroacoustic prediction of the tonal noise sources for rotors operating with time-varying rotor rotation rate (RPM) is explored. Enhancements to the CHARM analysis and CHARM/PSU-WOPWOP interface software are described that are required to support acoustic predictions of time-varying RPM multiple rotor and rotor + strut configurations. Predictions are compared with acoustic test data from (Ref. 1) and (Ref. 2) for both constant and time-varying RPM. The configuration with time-varying RPM was considered to understand the tonal noise sources with a focus on loading noise. The effect of change in RPM on aerodynamic interaction between rotor and strut and its effect on loading noise was studied. A comparison between NASA wind tunnel test data and predictions for an isolated ideally twisted rotor is carried out with time-varying rotor RPM data. Sound pressure spectrum plots are generated for raw test data, filtered test data (frequency range 250–1500 Hz), and acoustic pressure time history to perform validation at in-plane and out-of-plane microphones.


Aeroacoustic Prediction and Validation of Variable RPM Rotors and Rotor-Airframe Interactions for Advanced Air Mobility Applications

  • Presented at Forum 78
  • 16 pages
  • SKU # : F-0078-2022-17430
  • Acoustics-I

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Aeroacoustic Prediction and Validation of Variable RPM Rotors and Rotor-Airframe Interactions for Advanced Air Mobility Applications

Authors / Details:
Mrunali Botre, Daniel Wachspress, Continuum Dynamics Inc.
Kenneth Brentner, Ze Feng Ted Gan, Pennsylvania State University