Enhanced turbulence in an upwash fountain and fluid/acoustic resonance of an impinging axisymmetric jet are investigated by numerical simulations of the mean flow and the largest scales of the unsteady fluid motion. In the planar upwash, the simulated shear stress and spreading rate are three times greater than in a normal jet and are in good agreement with experimental data. Reynolds-stress transport mechanisms which lead to the enhanced turbulence are discussed, and a qualitative description of the large scale turbulent motions is proposed. A model for the pressure-strain term is determined to be a major source of error in Reynolds-stress transport modeling of the upwash. In an axisymmetric impinging jet at Mj = 0.9, resonant-like behavior with elevated levels of pressure fluctuations and dominance of a single frequency of vortex generation are observed. Vortex stretching is observed to be critical to the generation of noise in the impingement zone.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Turbulence and Fluid/Acoustic Interaction in Impinging Jets


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Nixon, David (Autor:in) / Childs, Robert E. (Autor:in)

    Kongress:

    SAE International Powered Lift Conference and Exposition ; 1987



    Erscheinungsdatum :

    1987-12-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Turbulence modeling for impinging jets

    CHILDS, ROBERT | AIAA | 1990


    Acoustic Characteristics of Impinging Multi Jets

    Jeyajothiraj, P. / Ramesha Babu, K. / Rathakrishnan, Ethirajan | AIAA | 2006


    Acoustic Characteristics of Impinging Multi Jets

    Jeyajothiraj, P. / Babu, K. R. / Rathakrishnan, E. et al. | British Library Conference Proceedings | 2006



    Neutral Acoustic Wave Modes in Supersonic Impinging Jets

    Ferreira, Fabien / Fiore, Maxime / Parisot-Dupuis, Hélène et al. | AIAA | 2022