@inproceedings{b7f49d20d0df4ffda1ffa5e8db70ccdf,
title = "COMPUTATIONAL INVESTIGATION OF THE EXPANSION EFFECT ON THE AERODYNAMICS AND AEROACOUSTICS OF DUCTED PROPELLERS",
abstract = "The aerodynamic and aeroacoustic characteristics of ducted propellers are studied with numerical simulations to investigate the effect of modifying the duct's expansion ratio. Steady simulations were conducted to efficiently obtain the mean flow field and the generated thrust. The results show that the downstream wake is sensitive to the duct's geometry. Slightly divergent ducts are found to maximize the total thrust, minimizing flow separation on the inner wall and reducing the wake speed while increasing the suction on the lip of the duct. The near-field transient flow field was obtained through delayed detached eddy simulations to analyze the noise characteristics. Far-field noise predictions were obtained with integral solutions of the Ffowcs-Williams and Hawkings (FW-H) equation. The spectra and directivity of the aerodynamic noise are compared for relevant cases. The present results reveal that divergent ducts can reduce the level of tonal noise at all observer angles, but they increase broadband noise. Consequently, diffusing ducts offer superior aerodynamic performance while also reducing tonal noise at the cost of higher broadband noise. The differences between the divergent ducts are limited, as the wake speed does not change significantly due to flow separation. The main noise generation is identified to be located on the propeller tip and leading edge. The results of this study deepen the understanding of the influence of the duct's geometrical design on the aerodynamic and aeroacoustic performance of ducted propellers.",
keywords = "computational aeroacoustics, computational fluid dynamics, ducted propeller, propeller noise",
author = "Sinforiano Cantos and Peng Zhou and Xin Zhang and Siyang Zhong",
note = "Publisher Copyright: {\textcopyright} 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.; 29th International Congress on Sound and Vibration, ICSV 2023 ; Conference date: 09-07-2023 Through 13-07-2023",
year = "2023",
month = jul,
language = "English",
series = "Proceedings of the International Congress on Sound and Vibration",
publisher = "Society of Acoustics",
editor = "Eleonora Carletti",
booktitle = "Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023 https://hdl.handle.net/1783.1/130272",
}