Airblast overpressure decay at long ranges

Abstract

An empirical model is presented for explosion wave propagation, which demonstrates that pressure amplitude is inversely proportional to distance raised to the 1.2 power. This model resulted from recordings of vertical propagations, essentially unrefracted by the horizontally stratified atmosphere, and by comparison of amplitudes from different yields after nearly simultaneous propagation along more complex atmospheric paths. Recent NASA rocket grenade experiments provide basis for extending the scaled range of applicability to 8000 km from a 1-kt nuclear explosion. Interpretation of airblast waves recorded at long ranges from explosions requires some assumptions about the propagation mechanismsas well as a definition of the wave source. Descriptions of explosive sources and early-time airblast parameters, such as overpressures, distances, and times, are well known [Glasstone, 1962], but confusion sometimes arises in scaling known explosive wave parameters to other detonationconditions. Less is known about

Analytic computations of nonideal corrections to blast wave overpressure predictions at high altitudes

“…Figure illustrates the generic form of a blast wave which is typically characterized by a peak value for the overpressure Δ p peak and a positive pressure phase duration τ . Scaling relations, obtainable from Glasstone and Dolan [] and Reed [], can be used to determine the value of τ for any blast wave given the parameters of a reference blast wave [ Reed , ].…”

“…The phenomenon of nonideal air blast propagation has been known for many years and had been the subject of many investigations over the years [e.g., Gilbert , ; Reed , ; Reed , ]. A blast wave is typically characterized by a nearly instantaneous pressure rise along its front as shown in Figure .…”

Системный Спектральный Анализ Инфразвукового Сигнала, Сгенерированного Челябинским Метеороидом

“…Амплитуда и спектр ин-фразвука несут в себе информацию об источ-нике волн и параметрах атмосферы [1][2][3][4][5][6][7][8][9].…”