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Showing papers on "Overpressure published in 1968"


Journal ArticleDOI
TL;DR: In this article, the authors derived the trajectory and overpressure of the intermediate strength blast wave (10 < Δp/p0 ⪝ 0.02) for spherical, cylindrical, and plane blasts.
Abstract: Equations for the trajectory and overpressure of the shock front of the intermediate strength blast wave (10 < Δp/p0 ⪝ 0.02) are developed for spherical, cylindrical, and plane blasts. These equations are based on the correct limit method that provided the trajectory of the blast wave from the inverse pinch to velocities below Mach number 1.16 (Δp/p0 = 0.4). The correct limit equations are an extension of the strong shock similarity solution of G. I. Taylor for the spherical blast and A. Sakurai and S. C. Lin for the cylindrical case. It is now possible, given the energy and ambient gas conditions, to trace the shock front trajectory and overpressure from the very strong through the very weak regimes. Conversely, the shock wave energy can be found from measurement of overpressure or arrival time. Comparisons with experimental data as well as the calculations of H. L. Brode verify the validity of the correct limit equations.

79 citations


Journal ArticleDOI
TL;DR: In this paper, a theoretical model of the shock wave from a lightning discharge ranging from the strong blast wave region out to the acoustic limit is given for the first time, where the trajectory and overpressure of the strong shock wave are described by the well-known equations for cylindrical blast waves.
Abstract: A theoretical model of the shock wave from a lightning discharge ranging from the strong blast wave region out to the acoustic limit is given for the first time. The trajectory and overpressure of the strong shock wave are described by the well-known equations for cylindrical blast waves. In the intermediate shock strength region (1.1 < M < 3.3), the shock trajectory is given by the ‘correct limit’ equation of Vlases and Jones. We derive an additional ‘correct limit’ equation for overpressure that is valid out to the acoustic limit. The correct limit equations predict a much slower decay of the intermediate shock wave; thus, the shock wave is much stronger at large distances from the discharge than was previously believed. Consequently, the range of action of the lightning discharge via its shock wave, as it affects the shattering and freezing of supercooled hydrometeors, may be large.

78 citations


Journal ArticleDOI
TL;DR: Sonic boom reduction by azimuthal redistribution of supersonic aircraft pressure field variation was studied in this article, where the authors proposed a method to reduce the sonic boom by adjusting the altitude of the aircraft.
Abstract: Sonic boom reduction by azimuthal redistribution of supersonic aircraft pressure field variation

39 citations



Journal ArticleDOI
TL;DR: In this article, the Fourier transform of the ideal air-shaking pulse was obtained by using the system frequency-response function to predict the measured time history of the pulse.

12 citations