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Acta Armamentarii ›› 2021, Vol. 42 ›› Issue (6): 1250-1256.doi: 10.3969/j.issn.1000-1093.2021.06.015

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Propagation Law of Explosion Wave in Columnar Explosion Tank under Vacuum Conditions

WANG Quan1,2, LU Junwei1, LI Zhimin3, LIN Chaojian1, LI Xuejiao1,2, CHENG Yangfan1,2, LI Rui1   

  1. (1.School of Chemical Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;2.Engineering Laboratory of Explosive Materials and Technology of Anhui Province,Huainan 232001,Anhui,China;3.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China)
  • Online:2021-07-19

Abstract: To analyze the propagation characteristics of explosion wave in a columnar explosion tank at negative pressure, the implosion test of a self-designed 320 mm×430 mm adjustable vacuum columnar explosion tank was made to obtain the blast wave propagation velocity u,overpressure Δp,specific impulse i, relative pressure factor α and relative specific impulse factor γ under different vacuum conditions. The results show that the change of vacuum in the tank has a significant effect on the propagation state of explosion wave,and when the initial pressure in the tank decreases,the explosion wave overpressure and specific impulse have different degrees of attenuation. When the initial pressure in the tank is reduced from atmospheric pressure to 0.1 atm, the relative pressure factor α1max of the first explosion wave Δp1 is 2.41,and the relative pressure factor α2max of the second explosion wave Δp2 is 1.64; the relative specific impulse factor γ1max of specific impulse i1 of the first explosion wave is 6.97,and the relative specific impulse factor γ2max of specific impulse i2 of the second explosion wave is 3.14. The relative pressure factor α and the relative specific impulse factor α reflect the degrees of attenuation of explosion wave overpressure and specific impulse,respectively,and the blast wave overpressure and specific impulse decay more quickly when α and γ are larger. In addition,the propagation speed of explosion wave changes with the change in the initial environmental pressure,and the lower the initial environmental pressure is,the faster the propagation speed of explosion wave is.

Key words: columnarexplosiontank, vacuumenvironment, explosionwave, initialpressure, specificimpulse

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