There is now a substantial body of theoretical and experimental evidence that the dominant part of the turbulent noise of supersonic jets is generated directly by the large turbulence structures/instability waves of the jet flow. Earlier, Tam and Burton provided a description of the physical mechanism by which supersonically traveling instability waves can generate sound efficiently. They used the method of matched asymptotic expansions to construct an instability wave solution which is valid in the far field. The present work is an extension of the theory of Tam and Burton. It is argued that the instability wave spectrum of the jet may be regarded as generated by stochastic white noise excitation at the nozzle lip region. The reason why the excitation has white noise characteristics is that near the nozzle lip region the flow in the jet mixing layer has no intrinsic length and time scales. The present stochastic wave model theory of supersonic jet noise contains a single unknown multiplicative constant. Comparisons between the calculated noise directivities at selected Strouhal numbers and experimental measurements of a Mach 2 jet at different jet temperatures have been carried out. Favorable agreements are found.


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    Title :

    Turbulent mixing noise from supersonic jets


    Contributors:

    Published in:

    Publication date :

    1994-09-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Turbulent Mixing Noise From Supersonic Jets

    Tam, C. K. W. / Chen, P. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1993


    Turbulent mixing noise from supersonic jets

    Tam, Christopher / Chen, Ping | AIAA | 1993


    Turbulent Mixing Noise from Supersonic Jets

    Tam, C.K.W. | Online Contents | 1994


    Turbulent mixing noise from supersonic jets

    Tam, Christopher K. W. / Chen, Ping | AIAA | 1994


    Location of Turbulent Mixing Noise Sources in supersonic Jets

    Washington, D. / Krothapalli, A. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1999