Studying an engineering model on an air blast wave

Abstract

This paper presents a new engineering model on the air blast wave of TNT explosive. The model is built and the parameters are calibrated based on numerical simulated pressure time data of shock wave in air. The model describes the peak overpressure, impulse, typical time and attenuation coefficient of the shock wave with new computational equations. Comparison of pressure configuration for the scaled distance shows that the present engineering model can give consistent results with the numerical code and experiments.

A Scaled Air Blast Model for High Altitudes

“…The model of the scaled typical time r T , d T and f T , which refer to the arrival time of shock wave, the duration time of positive overpressure and the arrival time of the maximum negative overpressure, need to be determined for describing overpressure distribution with time. r T is also computed by the shock front speed as in previous literature [4]. d T and f T are computed as eqn (5) and eqn (6).…”

“…There is no new change under high altitude condition. The calculation method and parameters are determined as in previous literature [4]. Fig.…”

“…The model of air blast wave usually describes the rules of overpressure changed with time with respect to the scaled distance after an explosion in air of equivalent TNT explosive. Several blast wave models have been presented based on experiments or numerical simulations [1]- [4]. With analysis on numerical simulated pressure time data, the author of this article have presented a simple and practical air blast model which can nicely describes blast wave for a long range of scaled distance [4].…”

“…Several blast wave models have been presented based on experiments or numerical simulations [1]- [4]. With analysis on numerical simulated pressure time data, the author of this article have presented a simple and practical air blast model which can nicely describes blast wave for a long range of scaled distance [4]. But the model cannot be used to analysis blast wave problems at high altitudes, so the motivation of the paper is to develop a new model for explosion at high altitudes.…”