装药偏差对小比例内爆炸试验结果影响分析

小比例内爆炸模型试验是当前国内外研究内爆炸荷载的主要方法。针对文献报道小比例内爆炸试验所得内爆炸荷载数据离散较大的特点，建立了考虑装药位置偏差的结构内爆炸流场三维有限元计算模型，对比试验数据验证了计算模型的合理性，比较分析了装药位置偏差对小比例内爆炸试验结果的影响。结果表明:内爆反射超压峰值对装药位置偏差非常敏感，拟合得到了装药位置偏差距离对超压峰值影响系数的经验计算公式；装药位置偏差对冲量影响相对较小，其最大相对差值不超过13%。

INFLUENCE OF EXPLOSIVE LOCATION DEPARTURE ON THE RESULTS OF SMALL SCALE INTERNAL BLAST EXPERIMENTS

A small scale internal blast experiment is one of the important methods to investigate an internal blast load.The published small scale internal blast experimental results offered us lots of data but show a wide scatter.In this paper,three dimensional finite element internal blast flow field calculating models taking an explosive location departure into account were established,and were validated with experimental data.Then the influence of explosive location departures on the results of small scale internal blast experiments was analyzed.The results show that the reflected peak overpressure is sensitive to an explosive location departure,and empirical formulas evaluating the peak overpressure variation are fitted.The impulse of internal blast has a slight difference while the explosive location departure near the center of a blast vessel,and the max relative error is less than 13%.