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  • 1.
    Sembian, Sundarapandian
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Liverts, Michael
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Apazidis, Nicholas
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Attenuation of strong external blast by foam barriers2016In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 9, article id 096105Article in journal (Refereed)
    Abstract [en]

    The mitigation of externally generated strong blast waves by an aqueous foam barrier of varying configurations within fixed distance between the explosion origin and the object to be protected is investigated and quantified both experimentally and numerically. The blast waves of shock Mach number 4.8 at 190 mm from the explosion plane are generated using exploding wire technique. The initially cylindrical blast waves are transformed into a plane blast wave in a specially constructed test unit in which the experiments are performed. The shock waves emanating from the foam barrier are captured using shadowgraph technique. A simple numerical model treating the foam by a pseudo-gas approach is used in interpreting and reconstructing the experimental results. The additional contribution of the impedance mismatch factor is analysed with the aid of numerical simulation and exploited for achieving greater blast wave pressure reduction.

  • 2.
    Sembian, Sundarapandian
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Liverts, Michael
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Apazidis, Nicholas
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Plane blast wave propagation in air with a transverse thermal inhomogeneity2018In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 67, p. 220-230Article in journal (Refereed)
    Abstract [en]

    An alternate mechanism explaining the shock broadening and splitting effects observed during its propagation through an elongated region with transverse thermal inhomogeneity is described. The shock wave is generated by exploding wire technique and its propagation is captured optically using shadowgraph method. Visualizing the flow provided distinct advantage not only for obtaining detailed information on the propagation characteristics but also for validating the numerical scheme used in the analysis. Three physical features namely shock jump, precursor region and vorticity induced flow, are identified to contribute to the shock structure with the latter two being responsible for the pressure profile ‘broadening’. The physical behavior of the incident shock is also analyzed along with other factors like temperature and curvature effects.

  • 3.
    Sembian, Sundarapandian
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Liverts, Michael
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Tillmark, Nils
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Apazidis, Nicholas
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Plane shock wave interaction with a cylindrical water column2016In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 5, article id 056102Article in journal (Refereed)
    Abstract [en]

    A complex system of waves propagating inside a water column due to the impact of plane shock wave is investigated both experimentally and numerically. Flow features, such as, focusing of expansion waves generating large negative pressure, nucleation of cavitation bubbles, and a re-circulation zone are observed and discussed qualitatively and quantitatively. Experiments are conducted on a 22 mm diametrical water column hit by shock waves with Mach numbers 1.75 and 2.4 in a newly constructed exploding wire facility. A new technique to create a properly shaped, repeatable, large diameter water column with straight walls is presented. Qualitative features of the flow are captured using the shadowgraph technique. With the aid of numerical simulations the wave motions inside the column are analyzed; the spatial location of the expansion wave focusing point and the corresponding negative peak pressures is estimated.

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