Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover

This paper investigates the aeroacoustic interactions of small hovering rotors, using both experiments and computations. The experiments were conducted in an anechoic chamber with arrays of microphones setup to evaluate the azimuthal and polar directivity. The computational methodology consists of h...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Austin David Thai, Elisa De Paola, Alessandro Di Marco, Luana Georgiana Stoica, Roberto Camussi, Roberto Tron, Sheryl Marie Grace
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aeroacoustics rotorcraft aerodynamics computational fluid dynamics experimental methods Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e58d4c560f7c4f26b79974e96ff588d1
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:e58d4c560f7c4f26b79974e96ff588d1
record_format	dspace
spelling	oai:doaj.org-article:e58d4c560f7c4f26b79974e96ff588d12021-11-11T15:05:48ZExperimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover10.3390/app1121100162076-3417https://doaj.org/article/e58d4c560f7c4f26b79974e96ff588d12021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10016https://doaj.org/toc/2076-3417This paper investigates the aeroacoustic interactions of small hovering rotors, using both experiments and computations. The experiments were conducted in an anechoic chamber with arrays of microphones setup to evaluate the azimuthal and polar directivity. The computational methodology consists of high fidelity detached eddy simulations coupled to the Ffowcs-Williams and Hawkings equation, supplemented by a trailing edge broadband noise code. The aerodynamics and aeroacoustics of a single rotor are investigated first. The simulations capture a Reynolds number effect seen in the performance parameters that results in the coefficient of thrust changing with the RPM. The acoustic analysis enables the identification of self-induced noise sources. Next, dual side-by-side rotors are studied in both counter-rotating and co-rotating configurations to quantify the impact of their interactions. Higher harmonics appear due to the interactions and it is verified that the counter-rotating case leads to more noise and a less uniform azimuthal directivity. Difficulties that arise when trying to validate small rotor calculations against experiments are discussed. Comparisons of computational and experimental results yield further insight into the noise mechanisms that are captured by each methodology.Austin David ThaiElisa De PaolaAlessandro Di MarcoLuana Georgiana StoicaRoberto CamussiRoberto TronSheryl Marie GraceMDPI AGarticleaeroacousticsrotorcraft aerodynamicscomputational fluid dynamicsexperimental methodsTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10016, p 10016 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aeroacoustics rotorcraft aerodynamics computational fluid dynamics experimental methods Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	aeroacoustics rotorcraft aerodynamics computational fluid dynamics experimental methods Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Austin David Thai Elisa De Paola Alessandro Di Marco Luana Georgiana Stoica Roberto Camussi Roberto Tron Sheryl Marie Grace Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
description	This paper investigates the aeroacoustic interactions of small hovering rotors, using both experiments and computations. The experiments were conducted in an anechoic chamber with arrays of microphones setup to evaluate the azimuthal and polar directivity. The computational methodology consists of high fidelity detached eddy simulations coupled to the Ffowcs-Williams and Hawkings equation, supplemented by a trailing edge broadband noise code. The aerodynamics and aeroacoustics of a single rotor are investigated first. The simulations capture a Reynolds number effect seen in the performance parameters that results in the coefficient of thrust changing with the RPM. The acoustic analysis enables the identification of self-induced noise sources. Next, dual side-by-side rotors are studied in both counter-rotating and co-rotating configurations to quantify the impact of their interactions. Higher harmonics appear due to the interactions and it is verified that the counter-rotating case leads to more noise and a less uniform azimuthal directivity. Difficulties that arise when trying to validate small rotor calculations against experiments are discussed. Comparisons of computational and experimental results yield further insight into the noise mechanisms that are captured by each methodology.
format	article
author	Austin David Thai Elisa De Paola Alessandro Di Marco Luana Georgiana Stoica Roberto Camussi Roberto Tron Sheryl Marie Grace
author_facet	Austin David Thai Elisa De Paola Alessandro Di Marco Luana Georgiana Stoica Roberto Camussi Roberto Tron Sheryl Marie Grace
author_sort	Austin David Thai
title	Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
title_short	Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
title_full	Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
title_fullStr	Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
title_full_unstemmed	Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover
title_sort	experimental and computational aeroacoustic investigation of small rotor interactions in hover
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e58d4c560f7c4f26b79974e96ff588d1
work_keys_str_mv	AT austindavidthai experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT elisadepaola experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT alessandrodimarco experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT luanageorgianastoica experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT robertocamussi experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT robertotron experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover AT sherylmariegrace experimentalandcomputationalaeroacousticinvestigationofsmallrotorinteractionsinhover
_version_	1718437185030455296

Experimental and Computational Aeroacoustic Investigation of Small Rotor Interactions in Hover

Ejemplares similares