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液体推进剂爆炸危害后果的精确计算需要对爆炸当量进行精确估算,实验测量存在高成本、高风险的缺点,而数值计算成本低、时间快、可重复性强,因而成为爆炸冲击波危害性研究的一种重要手段。基于爆炸相似律,利用LS-DYNA有限元软件对开放空间N_2O_4/UDMH爆炸模型进行了数值计算,研究了液体推进剂爆炸冲击波在无限空气域的传播规律。通过仿真值和实验值的对比分析,将引起实验误差的主要原因总结为测量点布置高度、测量装置加固情况和推进剂混合不均匀,并给出了相应的建议。
The precise calculation of the consequences of liquid propellants explosion requires accurate estimation of the explosive equivalence. The experimental measurements have the disadvantages of high cost and high risk. However, the computational cost is low, the time is fast and the repeatability is strong. An important means. Based on the explosion similarity law, the open space N 2 O 4 / UDMH explosion model was numerically calculated by LS-DYNA finite element software, and the propagation law of the explosion shock wave of liquid propellant in the infinite air field was studied. Through the comparison between the simulation value and the experimental value, the main causes of the experimental error are summarized as measuring point arrangement height, measuring device reinforcement and non-uniform mixing of propellant, and the corresponding suggestions are given.