Supersonic Jet Noise Reductions Predicted With Increased Jet Spreading Rate

Autor:	Philip J. Morris, Milo D. Dahl
Rok vydání:	1998
Předmět:	Physics Jet (fluid) Mechanical Engineering Acoustics Noise reduction Noise control Aeroacoustics Supersonic speed Mechanics Jet propulsion Jet noise Noise (radio)
Zdroj:	Journal of Fluids Engineering. 120:471-476
ISSN:	1528-901X 0098-2202
DOI:	10.1115/1.2820686
Popis:	In this paper, predictions are made of noise radiation from single, supersonic, axisymmetric jets. We examine the effects of changes in operating conditions and the effects of simulated enhanced mixing that would increase the spreading rate of the jet shear layer on radiated noise levels. The radiated noise in the downstream direction is dominated by mixing noise and, at higher speeds, it is well described by the instability wave noise radiation model. Further analysis with the model shows a relationship between changes in spreading rate due to enhanced mixing and changes in the far field radiated peak noise levels. The calculations predict that enhanced jet spreading results in a reduction of the radiated peak noise level.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::be1051d63e88c834330748bce7594b4d https://doi.org/10.1115/1.2820686 Zobrazit plný text záznamu