负压条件下球形爆炸容器内乳化炸药冲击波参数研究

Study of Shock Wave Parameters of Emulsified Explosives in Spherical Explosive Containers under Negative-pressure Conditions

为了探究负压条件下乳化炸药冲击波参数,在4m直径可调真空度球形爆炸容器内,开展不同负压和不同药量条件下的乳化炸药内爆实验,获得冲击波的超压时程曲线,重新拟合了乳化炸药在不同负压环境下的峰值超压公式和正压冲量公式。结果表明,乳化炸药质量每减少50g,峰值超压平均下降27%;环境压力每降低20kPa,峰值超压平均下降8.66%;乳化炸药在不同负压环境下的正压冲量约为单质炸药的81.3%;负压条件下的乳化炸药峰值超压和正压冲量实验值与传统经验公式相比误差均大于10%,而基于常压实验值拟合的公式与不同工况下的实验值误差均小于4%,能够精确预测不同负压环境下乳化炸药的冲击波参数。

The implosion experiments of emulsified explosives in various pressure and charge conditions were carried out in a 4m diameter adjustable vacuum spherical explosive container to obtain the overpressure—time curve of the shock wave to investigate the shock wave parameters of emulsified explosives in negative-pressure conditions,and the peak overpressure formula and positive impulse formula of emulsified explosives under different negative-pressure conditions were fitted.The results show that the peak overpressure decreases by an average of 27%for every 50g less emulsion explosive charged and 8.66%for every 20kPa less ambient pressure.The positive pressure impulse of emulsion explosives in various negative-pressure conditions is about 81.3%of that of a single compound.The experimental values of peak overpressure and positive impulse of emulsified explosives in negative-pressure conditions have an error of over 10%compared with the traditional empirical formulas.The residual of the equations fitted based on the experimental values at atmospheric pressure is less than 4%compared with the experimental values under different working conditions,which can accurately predict the shock wave parameters of emulsified explosives in various negative-pressure environments.