Experimental study on the coupling of shock wave and temperature field from a thermobaric explosive in a confined space
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摘要: 为研究温压炸药在密闭空间内爆炸时冲击波与温度的耦合增强效应,以100~400 g温压炸药为研究对象,在密闭建筑空间内开展爆炸试验研究,利用压力传感器和热电偶获得了密闭空间内不同位置处的爆炸压力和温度数据,揭示了温压炸药爆炸产生的冲击波与温度场演变特征及传播规律。结果表明:温压炸药内爆炸产生的温度场具有显著的二次升温和长持时特征;建立了基于比例爆距的初始温度峰值衰减模型。温压炸药内爆炸冲击波超压峰值的TNT等效当量系数随比例爆距的增大呈下凹双曲线变化趋势,在比例爆距为1.7 m/kg1/3时,冲击波超压的TNT等效当量系数达到最小值1.43,该位置是有氧后燃反应能量对冲击波超压峰值产生显著作用的转折点。建立了冲击波超压峰值的两阶段预测模型,分别描述了非理想爆轰与铝粉有氧后燃效应在不同区域对冲击波超压的贡献。基于爆炸产物膨胀和后燃升温引起的压力上升,建立了温压炸药内爆炸准静态压力预测模型,以100 g装药的准静态压力为基准,200、300、400 g装药质量下的准静态压力分别增至基准值的2.27、3.21、4.18倍,准静态压力在爆轰产物和后燃升温的耦合作用下呈非线性增长。Abstract: In order to investigate the coupled enhancement effects of shock wave and temperature generated by thermobaric explosives in confined spaces, internal explosion experiments were conducted with 100~400 g charges in a confined building space. Pressure sensors and thermocouples were employed to obtain the explosion pressure and temperature data at different locations within the confined space. The experiments revealed the evolution characteristics and propagation patterns of the shock wave and temperature field produced by the thermobaric explosive. The results show that the temperature generated by the internal explosion of the thermobaric explosive exhibits significant secondary heating and prolonged duration characteristics. A decay model for the initial peak temperature based on the scaled distance was established. The TNT equivalence coefficient of the shock wave from the internal explosion of the thermobaric explosive exhibits a concave hyperbolic trend with increasing scaled distance. At a scaled distance of 1.7 m/kg1/3, the TNT equivalence coefficient of the shock wave overpressure reaches a minimum value of 1.43, indicating that this position is the turning point where the energy from aerobic afterburn combustion exerts a significant effect on the peak overpressure. A two-stage prediction model for the peak overpressure was established, describing the contributions of non-ideal detonation and the aerobic afterburn effect of aluminum powder to the shock wave in different regions. Based on the pressure rise caused by the expansion of detonation products and the temperature rise due to afterburn combustion, a quasi-static pressure prediction model for the internal explosion of thermobaric explosives was established. Taking the quasi-static pressure of the 100 g charge as the reference, the quasi-static pressures for the 200, 300, and 400 g charges increased to 2.27, 3.21, and 4.18 times the reference value, respectively, showing a nonlinear growth under the coupled effect of detonation product expansion and afterburn temperature rise.
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Key words:
- thermobaric explosive /
- confined space /
- shock wave /
- temperature field /
- quasi-static pressure /
- equivalent effect
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表 1 不同装药质量温压炸药内爆炸各测点正压作用时间
Table 1. Positive pressure durations of internal explosions for thermobaric explosives with different charge masses
装药质量/g 正压作用时间/μs d=0.8 m d=1.0 m d=1.2 m d=1.4 m d=1.6 m 100 469.38 664.83 736.16 882.87 958.18 200 635.12 739.64 825.07 964.68 994.61 300 801.25 816.95 880.98 997.53 1013.42 400 904.62 956.78 978.94 1048.36 1085.44 -
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