Mach wave radiation by mixing layers. Part II: analysis of the source field
Avital, E.J., Sandham, N.D. and Luo, K.H. (1998) Mach wave radiation by mixing layers. Part II: analysis of the source field. Theoretical and Computational Fluid Dynamics, 12, (2), 91-108. (doi:10.1007/s001620050101).
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In Part II a large-scale sound source in a time-developing planar free mixing layer is studied using
an acoustic analogy approach. It is shown that only the non-compact character of the source resembles well
the character of the corresponding source in a spatially developing flow. A model based on a continuous
assembly of wave packets is derived and applied to direct numerical simulation results of two supersonic
time-developing mixing layers undergoing transition to turbulence. The analysis predicts two distinctive
dominant Mach wave sources in agreement with the direct analysis of Part I. The first dominates during
the stage of the ¤-vortex structure and the second just prior to the final breakdown to a fine-scale structure.
The convective velocity of the second Mach wave source is higher than the first and thus its Mach angle
of radiation is higher. The second source has a reduced strength at the higher free-stream Mach number.
Directivity and frequency spectra compare well with the results of Part I, demonstrating that the assumptions
inherent in the analogy are quite reasonable
|Subjects:||T Technology > TL Motor vehicles. Aeronautics. Astronautics|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||14 Jan 2010|
|Last Modified:||01 Jun 2011 07:29|
|Contributors:||Avital, E.J. (Author)
Sandham, N.D. (Author)
Luo, K.H. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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