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黑索今基含铝炸药烤燃实验和数值模拟 总被引:1,自引:0,他引:1
含铝(Al)炸药在烤燃过程中,Al粉会改变炸药内部传热机制从而影响炸药热反应,因此需要研究含Al炸药热反应特征。采用多点测温烤燃法,对压装黑索今(RDX)/石蜡(WAX)(96/4)炸药进行了烤燃实验,获得了炸药内部不同位置处温度变化;结合数值模拟计算,标定了RDX炸药反应动力学模型参数;分别采用多点测温烤燃法和烤燃弹法,对压装RDX/Al/Binder(60/31/9)和熔铸梯恩梯(TNT)/RDX/Al(60/24/16)两种含Al炸药进行了烤燃实验,获得了炸药内部温度变化及点火时间。建立含Al炸药热反应计算模型,计算分析了炸药热反应特征。对RDX/Al/Binder考虑了Al粉的吸热和热传导;对TNT/RDX/Al考虑了相变及多步热分解反应,并采用多组元网格单元计算法同时考虑Al粉的吸热;对炸药烤燃实验进行了数值模拟计算,通过与实验结果比较验证了计算结果的准确性。研究结果表明:Al粉的加入会加快压装RDX/Al/Binder(60/31/9)含Al炸药内部的传热速率,缩短其点火时间,降低炸药热安全性;Al粉的加入对铸装TNT/RDX/Al(60/24/16)含Al炸药的传热过程没有显著影响。 相似文献
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弹药在聚能射流作用下的反应机制和响应规律,对弹药安全性研究具有重要意义。针对隔板中前驱冲击波起爆炸药机制及炸药温度的影响,开展实验和数值模拟研究。设计大尺寸装药聚能射流侵彻不同厚度隔板,起爆加热炸药的实验装置,采用上下两端加热和侧面保温的方式,实现炸药均匀加热和温度控制。选取黑索今(RDX)含铝(Al)炸药(炸药配方质量比:RDX∶Al∶粘结剂为61%∶30%∶9%)在不同温度和隔板厚度下进行射流侵彻起爆实验,基于脉冲X光高速照相法,观测射流侵彻过程及炸药爆轰波成长。建立考虑炸药温度变化的射流起爆炸药计算模型,对射流侵彻隔板形成的前驱冲击波起爆炸药进行数值模拟。结果表明:射流侵彻厚隔板形成的前驱冲击波,先于射流到达炸药表面,在传入炸药一定深度后起爆炸药。入射压力介于3.1 GPa和5.13 GPa 之间,炸药发生隔板中前驱冲击波起爆,入射压力高于5.13 GPa为直接冲击起爆。RDX含铝炸药温度对前驱冲击波起爆炸药有很大影响,在25~111 ℃时,随着温度升高,炸药受粘结剂软化的影响为主,RDX含铝炸药对冲击波感度降低;但超过一定温度后,在111~150 ℃时,粘结剂的影响减弱,冲击感度主要受RDX炸药感度的影响,冲击感度又会增加。 相似文献
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利用飞秒激光的超短脉冲时间和超高能量密度的特点,可以实现对炸药的精密加工和纳米含能材料的制备。深入认识飞秒激光烧蚀炸药机理是发展飞秒激光加工技术的基础。采用反应分子动力学方法,基于ReaxFF/lg反应力场,对不同飞秒激光能量作用黑索今(RDX)过程进行分子动力学模拟,分析RDX初始分解反应路径、粒子扩散逃逸特征,研究不同飞秒激光能量作用下RDX的烧蚀机制。结果表明:在不同飞秒激光能量作用下,RDX的烧蚀机制不同。当激光能量较高时(激光能量1.0 mJ/pulse,激光能量密度51 J/cm2),RDX瞬间发生分解反应,产生高温高压等离子体,产物中有大量的单原子、离子以及小分子产物;当激光能量较低时(激光能量0.2 mJ/pulse,激光能量密度10.2 J/cm2),RDX主要以完整分子形式气化扩散逃逸,炸药以光机械烧蚀机制去除;在飞秒激光烧蚀炸药过程中,逃逸的粒子速度极高,粒子难以向未烧蚀区域传递能量,不会引发热扩散效应,因此能够实现对炸药的冷加工。 相似文献
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To improve the energy utilization efficiency of metal bridge foil explosion, and increase the function range of plasmas, array bridge foil explosion experiments with different structures were performed. A Schlieren photographic measurement system with a double-pulse laser source was used to observe the flow field of a bridge foil explosion. The evolution laws of plasmas and shock waves generated by array bridge foil explosions of different structures were analyzed and compared. A multi-phase flow calculation model was established to simulate the electrical exploding process of a metal bridge foil. The plasma equation of state was determined by considering the effect of the changing number of particles and Coulomb interaction on the pressure and internal energy. The ionization degree of the plasma was calculated via the Saha–Eggert equation assuming conditions of local thermal equilibrium. The exploding process of array bridge foils was simulated, and the superposition processes of plasma beams were analyzed. The variation and distribution laws of the density, temperature, pressure, and other important parameters were obtained. The results show that the array bridge foil has a larger plasma jet diameter than the single bridge foil for an equal total area of the bridge foil. We also found that the temperature, pressure, and density of the plasma jet's center region sharply increase because of the superposition of plasma beams. 相似文献