CHINESE JOURNAL OF ENERGETIC MATERIALS
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不同频率飞秒激光脉冲序列加工炸药过程安全性的数值计算
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北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081

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爆炸科学与技术国家重点实验室(北京理工大学)开放基金项目(KFJJ20-04M)


Numerical Calculation of the Safety of Processing Explosives with Femtosecond Laser Sequence with Different Frequencies
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State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

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    摘要:

    为了研究飞秒激光加工炸药技术的安全性,建立了飞秒激光脉冲序列加工炸药的计算模型,考虑了炸药在受热条件下的自热反应。采用数值计算的方法对飞秒激光脉冲序列烧蚀炸药(TNT,TATB和HMX)的过程进行了计算,分析了飞秒激光脉冲序列加工炸药过程的安全性。计算结果表明,飞秒激光脉冲序列频率、炸药自热反应放热量和热扩散系数会显著影响加工过程的安全性。在这三种炸药中,HMX自热反应的放热量最大,热扩散系数最小,因此热累积效应最明显,在三种不同频率(1×103 Hz,1×105 Hz和2×105 Hz)的飞秒激光脉冲序列作用下均发生了点火;相反,TATB的热累积效应最弱,在三种不同频率的飞秒激光脉冲序列作用下均未发生点火;TNT的热累积效应介于HMX和TATB之间,因此只在频率较高的飞秒激光脉冲序列作用下才发生点火。在实际加工过程中,特别是对自热反应放热量较大和热扩散系数较小的炸药,为保证加工过程的安全性,应尽量选用频率较低的飞秒激光脉冲序列对其进行加工。

    Abstract:

    In order to study the safety of processing explosives with femtosecond laser, a calculation model of femtsecond laser sequence machining on explosives was established, which took into account the autothermal reaction of the explosives. The processes of femtosecond laser sequence machining on three different explosives (TNT, TATB and HMX) were calculated. The safety of these processes was analyzed. Results show that the frequencies of the femtosecond laser sequence, the heat release of the autothermal reaction and the thermal diffusion coefficient of explosives will affect processing safety. Among these three explosives, the heat release of the autothermal reaction of HMX is the largest, and its thermal diffusion coefficient is the smallest, so its heat accumulation effect is the most significant. Therefore, HMX is ignited when processing with all the three femtosecond sequences with different frequencies (1×103 Hz, 1×105 Hz and 2×105 Hz). On the contrary, the heat accumulation effect of TATB is the weakest, so no ignition occurs when processing with the three femtosecond sequence with different frequencies. The heat accumulation effect of TNT is between those of HMX and TATB, so ignition only occurs when using the femtosecond laser sequence with higher frequencies. In the actual machining process, especially for the explosives with greater heat release of the autothermal reaction and smaller thermal diffusion coefficient, femtosecond laser sequence with low frequency should be selected to ensure safety.

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引用本文

伍俊英,刘嘉锡,杨利军,等.不同频率飞秒激光脉冲序列加工炸药过程安全性的数值计算[J].含能材料,2021,29(3):192-201. DOI:10.11943/CJEM2020183.
WU Jun-ying, LIU Jia-xi, YANG Li-jun, et al. Numerical Calculation of the Safety of Processing Explosives with Femtosecond Laser Sequence with Different Frequencies[J]. Chinese Journal of Energetic Materials, 2021, 29(3):192-201. DOI:10.11943/CJEM2020183.

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  • 收稿日期: 2020-07-10
  • 最后修改日期: 2021-01-27
  • 录用日期: 2020-12-11
  • 在线发布日期: 2021-01-26
  • 出版日期: 2021-03-25