Study on ultra-high speed photoelectric framing photography of the multi-point initiation of explosive
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摘要: 为获得炸药多点起爆的爆轰波传播过程精细细节，研究相适应的超高速光电分幅摄影技术，采用自主研制的超高速光电分幅相机，结合有机玻璃光快门，拍摄到以HMX和以TATB为基的塑料粘结炸药在三点同步起爆条件下纳秒时间分辨爆轰波发展高清晰序列图像，成功观察到爆轰波的整个传播及相互作用过程，捕获到内聚相互作用、马赫杆等波形细节结构。实验结果表明：超高速光电分幅摄影技术基于独立曝光模式，且具有曝光时间短、幅间隔连续可调、空间分辨高等优势，可精细观察到爆轰波传播、相互作用细节信息，该实验方法及其结果对于爆轰波相互作用及爆轰波马赫反射等问题研究具有一定的参考价值。Abstract: In order to obtain the propagation process of detonation wave by multi-point initiation of explosive, a suitable ultra-high speed photoelectric framing photography technique was studied. A self-developed ultra-high speed photoelectric framing camera with an exposure time of 5 ns, spatial resolution of 40 lp/mm and photographic frequency of 200 MHz combined with plexiglass optical shutter technology was adopted. We obtained eight high-resolution detonation wave images of plastic bonded explosives based on HMX and TATB under the condition of three-point synchronous initiation. The whole process of the detonation wave propagation and interaction was captured successfully, and the details of the coherent interaction and the Mach Rod were observed. The experimental results show that the ultra-high speed photoelectric framing photography based on the independent exposure mode have the advantages of short exposure time, continuous adjustable image interval and high spatial resolution, and the propagation and interaction of the detonation wave can be observed in great detail. The experimental method and results provide a valuable reference for the study of the interaction and Mach reflection of the detonation waves.
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图 3 超高速光电分幅摄影系统布局
Figure 3. Layout of the ultra-high speed photoelectric framing photography system
图 5 超高速光电摄影系统同步控制示意图
Figure 5. Synchronization control diagram of ultra-high speed photoelectric photography
图 6 HMX塑料粘结炸药三点起爆爆轰波传播过程图像
Figure 6. Three-point initiation detonation wave propagation image of HMX-based plastic-bonded explosive
图 7 TATB塑料粘结炸药三点起爆爆轰波传播过程图像
Figure 7. Three-point initiation detonation wave propagation image of TATB-based plastic-bonded explosive
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