Helicopter Rotor Noise in the Merged Tip-Vortex and Blade Interaction Condition

Autor:	Sb Kim S. B. Kim, Sy Wie Seong-Yong Wie, Dj Lee Duck-Joo Lee, Kh Chung K. H. Chung, Dk Im Dong-Kyun Im, Jh Kwon Jang-Hyuk Kwon
Rok vydání:	2011
Předmět:	Physics Acoustics and Ultrasonics business.industry Rotor (electric) Aerospace Engineering Mechanics Aerodynamics Wake Computational fluid dynamics Blade element theory law.invention Vortex Physics::Fluid Dynamics Noise law Aerospace engineering Helicopter rotor business
Zdroj:	International Journal of Aeroacoustics. 10:427-442
ISSN:	2048-4003 1475-472X
DOI:	10.1260/1475-472x.10.4.427
Popis:	BVI (blade vortex interaction) phenomena cause unsteady loading and noise in the helicopter rotor. It is difficult to accurately predict BVI aerodynamics and noise, because rotor wake and tip-vortices are numerically dissipated. In the present study, CFD and a time-marching free-wake coupling analysis were used to describe inflow and outflow without wake dissipation. Rotor noise was also computed using the Farassat formula, derived from the Ffowcs-Williams Hawkings equation. To validate aerodynamics and the noise prediction solver, a two-blade rotor was simulated and the results were compared with experimental data. To investigate the vortex interaction of a multi-blade rotor, a four-blade rotor was also simulated. In a slow descent flight condition, tip vortices are merged at the advancing side. The merged tip-vortex and blade interaction were simulated and are discussed in this paper.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bcc4404cb2b1de0ba40b801987dbf734 https://doi.org/10.1260/1475-472x.10.4.427 Zobrazit plný text záznamu Plný text ve formátu PDF