https://doi.org/10.1140/epjp/s13360-024-05512-5
Regular Article
Quantitative determination of multi-field energy for Al/PTFE deflagration under loose shielding charge
Key Laboratory of Transient Physical Mechanics and Energy Conversion Materials of Liaoning Province, Shenyang Ligong University, 110159, Shenyang, China
a
hanyafei1979@126.com
c
tangenling@126.com
Received:
10
December
2023
Accepted:
28
July
2024
Published online:
5
August
2024
The deflagration process of energetic materials is accompanied by the rapid release of chemical energy, and the internal energy of the energetic system is instantaneously transformed into mechanical work, heat, acoustic, light flash and electromagnetic radiation. The accelerated development of modern chemical synthesis technology has gradually increased the proportion of energy release in non-thermal forms in the high-power release process of energetic materials, which is of great significance for the quantitative characterization of multi-field energy release in non-thermal forms. In this paper, an evaluation method of multi-physical field energy of energetic materials is proposed. The parameters of acoustic, optical, thermal and electromagnetic multi-physical fields are measured, and the energy of each physical field is evaluated. The quantitative characterization of the above multi-physical field energy is helpful to comprehensively evaluate the energy release characteristics of materials, guide the selection and improvement of materials, and meet the application requirements in different fields. The results show that the Al/PTFE mixture releases high-temperature and high-pressure products during the deflagration process, resulting in a sharp increase in temperature and pressure, and contains significant electromagnetic radiation signals and visible light signals. During the deflagration reaction process, the highest temperature can arrive at 2844 K, and the pressure peak can arrive at 84.2 kPa; the light flash radiant intensity corresponding to the wavelength of 500 nm is the largest, and the light flash intensity can reach 0.5 W/nm/cm2. The peak value of the acoustic is between 111.5 and 113.5 dB, and the signal is mainly concentrated in the low frequency (0–10 kHz), and the main frequency bands of electromagnetic signals are 5–30 Hz and 100–150 kHz. The average total energy released by the mixture of 5.7 g and 4.0 g energetic materials is 49.299 kJ and 40.138 kJ, respectively, and the energy release per unit mass is 8.649 kJ/g and 10.034 kJ/g, respectively.
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