A rectangular external-compression supersonic inlet with a shock-on-lip Mach number of 2.0 is carefully studied at a freestream Mach number of 2.5. In the throttling process before the onset of buzz, the interaction between the ramp shock and the cowl-induced bow shock appears as regular reflection, Mach reflection, and λ-shaped pattern successively. It is interestingly found that the currently observed Mach reflection, which should have been broken down shortly after the emergence as reported previously, keeps fairly stable until the throttling ratio changes. In the remaining buzz stage, three types of instabilities of similar frequencies but of different oscillating behaviors and amplitudes are observed. The term medium buzz is adopted to describe the special buzz phenomenon with moderate oscillations. It is shown that both the little buzz and big buzz are characterized by the separation oscillation, whereas the medium buzz features the oscillation of the cowl-induced bow shock. Further analysis indicates that all three buzz phenomena probably share a common origin (i.e., the ramp-side flow separation). Also, it is demonstrated that the transition of buzz flows in the throttling process is attributed to the changes of disturbance strength and dominant role between two feedback loops.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Throttling Process and Buzz Mechanism of a Supersonic Inlet at Overspeed Mode


    Contributors:
    Chen, Hao (author) / Tan, Hui-Jun (author) / Zhang, Qi-Fan (author) / Zhang, Yue (author)

    Published in:

    AIAA Journal ; 56 , 5 ; 1953-1964


    Publication date :

    2018-05-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Numerical Study on Supersonic Inlet Buzz Under Various Throttling Conditions and Fluid-Structure Interaction

    Hong, W. / Kim, C. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011



    Experimental Study of Supersonic Inlet Buzz

    Simon Trapier / Philippe Duveau / Sébastien Deck | AIAA | 2006



    Supersonic inlet buzz margin control of ducted rockets

    Shi, X / Chang, J-T / Bao, W et al. | SAGE Publications | 2010