The published experimental results of close range internal blast offered us lots of data but showed a wide scatter. In order to investigate the influence of ignition location departure on the blast load of close range internal blast, three-dimensional finite element internal blast flow field calculating models taking ignition location departure into account were established and were validated with experimental data. Then the internal blast flow field was calculated with numerical method as ignition location departure from the center of charge. The results show that the reflected peak overpressure is sensitive to the ignition location departure. The empirical formulas evaluating the peak overpressure variation were fitted. The impulse of internal blast has slight difference while the detonation location departure from the center of charge, and the max relative error is less than 2%.%针对结构近距内爆炸试验所得的内爆炸荷载数据离散较大的特点,建立考虑起爆位置偏差影响的三维有限元内爆炸流场计算数值模型,对比试验数据验证了数值计算模型的合理性.采用数值方法计算了起爆位置有偏差时的内爆炸流场,对比分析了起爆位置偏差对结构近距内爆炸荷载的影响.结果表明:结构内爆壁面反射超压峰值对起爆位置偏差非常敏感,拟合得到了起爆位置偏差距离对超压峰值影响系数的经验计算公式；起爆位置偏差对冲量影响很小,其最大相对差值不超过2％.
展开▼
