Noise Source Analysis of a Rod–Airfoil Configuration Using Unstructured Large-Eddy Simulation

Autor:	Jean-Christophe Giret, Jean-Christophe Jouhaud, Marlène Sanjosé, Alois Sengissen, Stéphane Moreau
Rok vydání:	2015
Předmět:	Airfoil Physics business.industry Aerospace Engineering Spectral density Near and far field Computational physics NACA airfoil Flow separation Optics Harmonics business Noise (radio) Large eddy simulation
Zdroj:	AIAA Journal. 53:1062-1077
ISSN:	1533-385X 0001-1452
DOI:	10.2514/1.j053371
Popis:	The noise generated by a rod–airfoil configuration is investigated using unstructured Large-Eddy simulation coupled with a Ffowcs-Williams and Hawkings technique. The detailed experimental database and several numerical simulations available enable an extensive validation of the proposed methodology. Similar or improved results are obtained both in the near field (surface coefficient distributions and velocity profiles) and in the acoustic far field (power spectral densities obtained with both porous and solid surfaces, and directivities) compared with the best and most recent simulations. Dipolar noise radiation at the rod vortex-shedding frequency and its harmonics are found to be dominant. Some additional quadrupolar source contributions are seen at low and high frequencies. The rod is shown to have a significant contribution to the far-field noise at grazing angles. Constructive interferences occur normal to the rod–airfoil axis, whereas destructive interferences appear at grazing angles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bf76eae37864420a2030298e72e69eed https://doi.org/10.2514/1.j053371 Zobrazit plný text záznamu