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 (Re∞=28×106 to 63×106  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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Mach and Reynolds Number Effects on the Wake Properties of Microramps



    Published in:

    AIAA journal ; 54 , 11 ; 3481-3494


    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    50.93 / 55.50 Luftfahrzeugtechnik / 50.93 Weltraumforschung / 55.60 Raumfahrttechnik / 55.50 / 55.60
    Local classification TIB:    770/7040



    Mach and Reynolds Number Effects on the Wake Properties of Microramps

    Giepman, Rogier H. M. / Srivastava, Aabhas / Schrijer, Ferry F. J. et al. | AIAA | 2016



    Reynolds and Mach Number Effects on Multielement Airfoils

    W. O. Valarezo / C. J. Dominik / R. J. Mcghee | NTIS | 1992


    Reynolds and Mach number effects on multielement airfoils

    Valarezo, Walter O. / Dominik, Chet J. / Mcghee, Robert J. | NTRS | 1992


    Reynolds Number and Mach Number Effects on the Shock-Induced Separation

    Zuo, Feng-Yuan / Shen, Yu / Wei, Jia-Rui et al. | AIAA | 2024