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On Broadband Shock Associated Noise of Supersonic Jets

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Recent Advances in Aeroacoustics

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Abstract

The noise of supersonic jets issued from choked or convergent-divergent nozzles is a subject of considerable current interest. When these jets are operated at off-design pressure ratios, measured noise spectra invariably show that they are made up of discrete and broadband components. The discrete tones or screech components are believed to be generated by an acoustic feedback phenomenon. One notable feature of these screech components is that the frequencies of the tones are the same in all directions. The broadband noise components have dominant frequencies which are usually higher than that of the fundamental feedback tone and range over several octave bands. At the present time, based on experimental and theoretical grounds, the broadband noise is generally further subdivided into two components each possessing distinctly different characteristics. These components are referred to as the turbulent mixing noise and the broadband shock associated noise or simply shock associated noise. The general consensus appears to be that the former is generated directly by the turbulence of the jet flow while the latter is produced by the unsteady interaction between the flow turbulence and the quasi-periodic shock cell structure of the jet. The primary objective of this paper is quite restricted.

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Author information

Authors and Affiliations

  1. Department of Mathematics, Florida State University, Tallahassee, Florida, 32306, USA

    Christopher K. W. Tam

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  1. Christopher K. W. Tam
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Editors and Affiliations

  1. Department of Mechanical Engineering FAMU/FSU College of Engineering, The Florida State University, Tallahassee, FL, 32306, USA

    Anjaneyulu Krothapalli

  2. NASA Ames Research Center, Moffett Field, CA, 94035, USA

    Charles A. Smith

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© 1986 Springer-Verlag New York Inc.

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Tam, C.K.W. (1986). On Broadband Shock Associated Noise of Supersonic Jets. In: Krothapalli, A., Smith, C.A. (eds) Recent Advances in Aeroacoustics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4840-8_2

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  • DOI: https://doi.org/10.1007/978-1-4612-4840-8_2

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4612-9324-8

  • Online ISBN: 978-1-4612-4840-8

  • eBook Packages: Springer Book Archive

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