Determination of JWL equation of state based on the detonation product from underwater explosion

JIAO Junjie; SHAN Feng; WANG Hancheng; QI Yanjie; PAN Xuchao; FANG Zhong; CHENG Yubo; HE Xiaolan; CI Shengjie; HE Yong

doi:10.11883/bzycj-2024-0203

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JIAO Junjie, SHAN Feng, WANG Hancheng, QI Yanjie, PAN Xuchao, FANG Zhong, CHENG Yubo, HE Xiaolan, CI Shengjie, HE Yong. Determination of JWL equation of state based on the detonation product from underwater explosion[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0203

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Determination of JWL equation of state based on the detonation product from underwater explosion

doi: 10.11883/bzycj-2024-0203

Mechanical Engineering College, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2024-06-27
Rev Recd Date: 2024-10-18

Available Online: 2024-11-05

Abstract

Abstract

The equation of state for the detonation products of explosives is one of the foundations in explosion physics. JWL equation of state has been widely applied to study the properties of various explosives. In order to obtain the equation of state of the detonation products, an underwater explosion method was used to study JWL equation of state for the detonation of RDX. It considered the explosion bubble expansion process based on the conservation of energy including E_s0 (initial shock wave energy), E_pt (potential energy of water), E_c (kinetic energy of water) and E_r (energy loss by bubble expansion), which are related to the underwater explosion bubble radius (R-t) and shock wave front (R_s-t) measured in the underwater explosion experiments as functions of time. Based on the experimental results and using the same method to process the experimental data in cylinder experiment, the time functions of explosion bubble expansion radius and variation of shock wave front position were fitted and the parameters of the JWL equation of state for RDX detonation products were obtained. In order to analyze the accuracy of the parameters of the JWL equation of state obtained by the underwater explosion method, the time history of the underwater explosions bubble pulsating pressure wave was calculated using the bubble dynamics equation. It shows that the calculation results agree well with the bubble expansion radius and bubble pulsation period determined using the underwater explosion experiments in a pool. The calculated bubble radius obtained by the proposed measurement method has a smaller deviation from that obtained by the cylinder experimental value, especially in the low-pressure stage compare with the JWL state parameters obtained from cylinder method. This method provides a testing approach for the equation of state of detonation products with low cost, reduced size limitations and a wide pressure range.
- underwater explosion,
- JWL,
- equation of state,
- bubble expansion,
- shock wave

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