Experimental Study on the Deflagration Mechanism of High-energy Propellant Charge Subjected to Fragment Impact

doi:10.12382/bgxb.2024.0293

Abstract

Abstract:

To reveal the mechanism of deflagration formation in high-energy propellant charge subjected to fragment impact,the semi-perforation and penetration of fragments into high-energy propellant charges are tested.The response types of charge are combustion-to-deflagration transition,combustion and deflagration.Based on the time-series image of charge reaction evolution and recovered samples,the response process of charge is comprehensively characterized using the image digital processing technology.The mechanical deformation and charge response characteristics of propellant after penetration are analyzed,and the deflagration mechanism of charge during semi-perforation and penetrating is revealed.The results indicate that,the trajectory penetration damage of the high-energy propellant charge impacted by a tungsten alloy fragment with a diameter of 10 mm is local radial cracking,and is accompanied by a delayed deformation caused by viscoelastic dissipation.There is a delayed reaction of the charge during semi-perforation and penetrating.that is,the significant combustion reaction of the charge occurs after the failure of propellant structure.During semi-perforation,the delayed deformation causes the high-intensity reaction zone inside the charge to move forward and coupled with structural constraints,resulting in combustion to deflagration transition.The charge is difficult to undergo deflagration reaction when delayed deformation and delayed reaction are significantly present in the penetrating state.When the combustion gas inside the crater seeps into the unreacted condensed phase propellant through the radial cracks of penetration trajectory,the charge usually undergoes a deflagration reaction.

Key words: fragment impact, high-energy propellant charge, viscoelastic dissipation, deflagration mechanism, flame jet

CLC Number:

V512

WANG Xin, WU Yanqing, YANG Kun, WU Yi, HOU Xiao. Experimental Study on the Deflagration Mechanism of High-energy Propellant Charge Subjected to Fragment Impact[J]. Acta Armamentarii, 2025, 46(3): 240293-.

Figures/Tables 11

Fig.1 Microscopic structure of experimental high-energy propellant samples and the structure of charge

Fig.2 Overall layout of the experiment on the reaction evolution of high-energy propellant charge impacted by fragment

Fig.3 Reaction time series image of high-energy propellant charge impacted by fragment

Fig.4 The shells recovered afterexperiment

Table 1 Experimental results of high-energy propellant charge impacted by fragment

速度/ (m·s^-1)	装药响应特征	反应等级
469	破片未贯穿装药,初始火焰射流形成在入射弹孔,冒烟,端盖抛射,大块推进剂块抛射,小块体推进剂抛射并且燃烧、引燃周围可燃物;前期的响声是哒哒声,后期似炸药爆炸声	爆燃
746	破片贯穿装药,初始火焰射流形成在贯穿弹孔,随后形成双向火焰射流,无端盖抛射现象,弹孔位置熔化现象显著,推进剂被消耗完全;响声为持续的哒哒声	燃烧
1373	破片贯穿装药,初始火焰射流形成在入射弹孔,随后形成双向火焰射流,端盖抛射,大块推进剂块抛射,小块体推进剂抛射燃烧,引燃周围可燃物,弹孔鼓包、破裂和部分熔化;响声似炸药爆炸声	爆燃

Fig.5 Brightness-time curves of flame for reaction evolution of propellant charge

Fig.6 Mechanical deformation characteristics of propellant penetrated by spherical fragment

Fig.7 Unreacted propellant blocks recovered after experiment (469m/s)

Fig.8 Deflagration mechanism of propellant charge under 469m/s

Fig.9 Unreacted propellant blocks recovered after experiment(1373m/s)

Fig.10 Deflagration mechanism of propellant charge under 1373m/s

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