A parametric study has been conducted into the effects of device height ( h = 6 10    mm ), Mach number ( M = 1.5 2.5 ), and Reynolds number ( R e = 28 × 10 6 to 63 × 10 6    m 1 ) on the effectiveness of microramp vortex generators as flow control devices. The control authority of the microramp comes from the two counter-rotating vortices it introduces into the boundary layer. The vortices transport high-momentum fluid toward the wall, thus creating a fuller velocity profile that is less prone to separation. This momentum transport, however, comes at the price of a low-momentum wake that is formed downstream of the device. The induced flowfield has been studied by means of two-dimensional particle image velocimetry, oil-flow, and schlieren visualizations. Most of the geometric flow features were found to scale linearly with microramp height h : the wake height, wake strength, vortex core height, and the momentum flux added to the near-wall region of the flow all increase linearly with h . The control effectiveness of the microramp in the symmetry plane is reduced for higher Mach numbers ( M = 2.5 ) as the strength of the vortices is reduced, which adds less momentum to the near-wall region of the flow. Also, a stronger wake is recorded for the higher Mach number cases. Only a weak Reynolds number effect is observed, with the microramp becoming slightly more effective at higher Reynolds numbers.


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    Titel :

    Mach and Reynolds Number Effects on the Wake Properties of Microramps



    Erschienen in:

    AIAA Journal ; 54 , 11 ; 3481-3494


    Erscheinungsdatum :

    01.11.2016




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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