The effects of adverse pressure gradients on the receptivity and stability of hypersonic boundary layers were numerically investigated. Simulations were performed for boundary-layer flows over a straight cone and two flared cones. The steady and the unsteady flowfields were obtained by solving the two-dimensional Navier–Stokes equations in axisymmetric coordinates using the fifth-order-accurate weighted essentially nonoscillatory scheme for space discretization and using a third-order total-variation-diminishing Runge–Kutta scheme for time integration. The mean boundary-layer profiles were analyzed using local stability and nonlocal parabolized stability equations methods. After the most amplified disturbances were identified, two-dimensional plane acoustic waves were introduced at the outer boundary of the computational domain and time-accurate simulations were performed. The adverse pressure gradient was found to affect the boundary-layer stability in two important ways. First, the frequency of the most amplified second-mode disturbance was increased relative to the zero-pressure gradient case. Second, the amplification of first- and second-mode disturbances was increased. Although an adverse pressure gradient enhances instability wave growth rates, small nose-tip bluntness was found to delay transition due to the low receptivity coefficient and the resulting weak initial amplitude of the instability waves. The computed and measured amplitude-frequency spectra in all three cases agree very well in terms of frequency and the shape except for the amplitude.


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    Title :

    Receptivity of Hypersonic Boundary Layers over Straight and Flared Cones


    Contributors:

    Published in:

    AIAA Journal ; 53 , 8 ; 2097-2109


    Publication date :

    2015-06-08


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    RECEPTIVITY OF HYPERSONIC BOUNDARY LAYERS OVER STRAIGHT AND FLARED CONES

    Balakumar, P. / Kegerise, M. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2010


    Receptivity of Hypersonic Boundary Layers over Straight and Flared Cones

    Balakumar, Ponnampalam / Kegerise, Michael | AIAA | 2010




    Effects of Nose Bluntness on Hypersonic Boundary-Layer Receptivity and Stability over Cones

    Kara, Kursat / Balakumar, Ponnampalam / Kandil, Osama A. | AIAA | 2011