Computer Science – Sound
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rspta.288..321d&link_type=abstract
Royal Society (London), Philosophical Transactions, Series A, vol. 288, no. 1353, Mar. 23, 1978, p. 321-349.
Computer Science
Sound
13
Aeroacoustics, Aerodynamic Noise, Gas Streams, Jet Flow, Vortex Sheets, Analogies, Lighthill Gas Model, Reciprocal Theorems, Shear Layers, Stress Tensors
Scientific paper
Jet noise is modeled by particle-attached quadrupoles convected with the velocity of the actual fluid but positioned near a hypothetical instability-free vortex sheet. The strength of each quadrupole is Lighthill's stress tensor per unit mass. The work of Mani (1976) has shown that this type of model agrees well with experiment, and the present work establishes some of the equivalent sources needed for an exact analogy. The instability waves of the shear layer, as they grow into turbulence, are heard as sound that builds up as a precursor of the main turbulence-driven field. The circular compact jet is examined in some detail, and it is found that when the jet is very light it can provide a waveguide in which the effects of source activity persist for some time but eventually leak out as sound. This interaction greatly distorts the free field characteristics of the turbulent sources, so that Reynolds-stress-induced waves have an intensity that scales with the fourth power of jet velocity.
Dowling A. P.
Ffowcs Williams J. E.
Goldstein M. E.
No associations
LandOfFree
Sound production in a moving stream does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Sound production in a moving stream, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sound production in a moving stream will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1083453