The farfield noise characteristics of a subsonic whistler nozzle jet are measured as a function of Mach number (0.25, 0.37, and, 0.51), emission angle, and excitation mode. It is shown that a whistler nozzle has greater total and broadband acoustic power than an excited contraction nozzle; and that the intensity of far-field noise is a function of emission angle, Mach number, and whistler excitation stage. The whistler nozzle excitation produces broadband noise amplification with constant spectral shape; the broadband noise amplification (without associated whistler tones and harmonics) increases omnidirectionally with emission angle at all Mach numbers; and the broadband amplification factor decreases as Mach number and emission angle increase. Finally the whistler nozzle is described as a very efficient but inexpensive siren with applications in not only jet excitation but also acoustics.


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    Titel :

    Jet noise modification by the 'whistler nozzle'


    Beteiligte:
    Hasan, M. A. Z. (Autor:in) / Islam, O. (Autor:in) / Hussain, A. K. M. F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1984-03-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Jet Noise Modification by the Whistler Nozzle.

    M.A.Z. Hasan / A.K.M.F. Hussain | AIAA | 1984



    Cyclotron Amplification of Whistler Waves

    Hobara, Y. | Online Contents | 1999


    Cyclotron Amplification of Whistler Waves

    Hobara, Y. / Trakhtengerts, V. Y. / Demekhov, A. G. et al. | British Library Conference Proceedings | 1999