液体推进剂爆炸冲击波数值计算及实验误差分析

摘要

The accurate calculation of the explosion equivalent needs to be used in the accurate calculation of the damage consequence of liquid propellant blast.The experimental measurement has the disadvantages of high cost and high risk.Numerical calculation is an important method to study the harmfulness of blast wave, because of its low cost, rapidity and strong repeatability.According to the Blasting Similarity Theory, LS-DYNA is used to calculate the open space N204/UDMH blast model.The propagation law of the blast wave of liquid propellant in the open air is studied.Through the comparative analysis between simulation results and experiment results, the causes of the experimental errors are summarized as the height of the measuring point, the reinforcement of the measuring device and the inhomogeneous mixing of the propellant, with some suggestions given to provide reference for the improvement of the experiment accuracy.%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N2O4/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.