Supersonic Jet Noise Reductions Predicted With Increased Jet Spreading Rate | Zendy

Milo D. Dahl | Zendy; Philip J. Morris | Zendy

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Supersonic Jet Noise Reductions Predicted With Increased Jet Spreading Rate

Author(s) -

Milo D. Dahl,

Philip J. Morris

Publication year - 1998

Publication title -

journal of fluids engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.529

H-Index - 103

eISSN - 1528-901X

pISSN - 0098-2202

DOI - 10.1115/1.2820686

Subject(s) - supersonic speed , jet noise , jet (fluid) , noise (video) , acoustics , mixing (physics) , physics , mechanics , instability , rotational symmetry , nozzle , computational physics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , thermodynamics

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.

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