Computer Science – Sound
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977asaj...62..117c&link_type=abstract
Acoustical Society of America, Journal, vol. 62, July 1977, p. 117-124.
Computer Science
Sound
Acoustic Simulation, Jet Aircraft Noise, Liquid Surfaces, Noise Generators, Noise Propagation, Surface Acoustic Wave Devices, Far Fields, Free Jets, Mach Number, Noise Measurement, Noise Spectra, Power Spectra, Propagation Velocity, Turbulence Effects, Two Dimensional Jets, Velocity Distribution
Scientific paper
A shallow liquid surface-wave analogy to turbulence-induced sound was utilized to investigate the mechanisms of noise generation and propagation in jets. Theoretical analysis was used to determine the wave-power dependence on Mach number and to derive the relationship between wave and turbulence spectra. The experimental investigation utilized a 24-sq ft mercury ripple tank. The waves were produced by the turbulence in a mercury jet exhausting into the tank. The results substantiate the validity of the surface-wave analogy as a jet-noise simulator. Measurement of mean and turbulent velocity profiles proved that the jet development was similar to the theoretical plane-free jet. Far-field measurements of wave power, directivity, and spectra compared favorably with the acoustic case. However, the wave spectra showed little of the higher-frequency content found in the turbulence spectra. This difference was attributed to the vertical spatial integration of the turbulence-source terms, which is not found in jet noise.
Colwill W. H.
Reethof G.
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