@inproceedings{672d233d60f14662953ff8cfe9bf16ca,
title = "EXPERIMENTAL ANALYSIS OF THE TRANSIENT AEROACOUSTIC INTERACTION OF COAXIAL CONTRA-ROTATING ROTORS",
abstract = "This paper describes an experimental study of the transient aeroacoustic interaction of drone-scale coaxial contra-rotating rotors in an anechoic chamber. A high-precision synchrophasing control system is employed to enable phase-locked measurements of the aeroacoustic interaction process. By combining wavelet transform and microphone array measurements, the spatial-time-frequency characteristics of the far-field noise are obtained. The results indicate that the overlapping of the rotor blades produces prominent low-frequency noise attributed to potential field interaction and the noise level decays rapidly with the increase of rotor spacing. After a phase delay from the blade overlapping, a high-frequency broadband noise with a relatively lower level emerges. This high-frequency noise is inferred to be caused by blade-tip vortex interaction because the phase delay increases with the rotor spacing, which is validated by phase-locked flow field measurements using particle image velocimetry and noise source localization using wavelet-based beamforming. The results reveal the transient aeroacoustic interaction process and provide insights into the development of low-noise coaxial contra-rotating rotor systems.",
keywords = "Coaxial rotors, Interaction noise, Synchrophasing, Transient process, UAM",
author = "Zhida Ma and Wangqiao Chen and Guangsheng Liu and Han Wu and Peng Zhou and Xin Zhang and Siyang Zhong",
note = "Publisher Copyright: {\textcopyright} 2024 Proceedings of the International Congress on Sound and Vibration. All rights reserved.; 30th International Congress on Sound and Vibration, ICSV 2024 ; Conference date: 08-07-2024 Through 11-07-2024",
year = "2024",
language = "English",
series = "Proceedings of the International Congress on Sound and Vibration",
publisher = "Romanian Society of Acoustics",
editor = "\{van Keulen\}, Wim and Jim Kok",
booktitle = "Proceedings of the 30th International Congress on Sound and Vibration, ICSV 2024",
address = "Romania",
}