1. Study on the Propagation Law of Explosion Shock Waves in Closed Variable-Section Tube Under High-Pressure Environment.
- Author
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Liu, Fei, Huang, Chao-yuan, Xin, Kai, Gao, Yong-hong, Yan, Min-hua, Zhang, Yao-yao, and Zhou, Li-qiang
- Subjects
SHOCK waves ,TUBES ,SHOCK tubes ,LEGAL education ,NUCLEAR explosions ,ATTENUATION coefficients - Abstract
Purpose: The combination of high-pressure air and TNT in shock tubes can effectively simulate real nuclear explosions and conventional weapon explosion shock waves. However, the explosion shock wave parameters are greatly affected by changes in the tube sections and the increase in the initial air pressure. Methods: In this study, the propagation law of explosion shock waves in closed variable section tubes was studied first through theoretical analysis and explosion tests under five different high-pressure environments. Then, the influences of different initial pressures of 100–500 kPa on shock wave related parameters were analyzed by numerical simulation, the change curves of the shock wave overpressure peak and different initial pressures at different test points were fitted, and the change process of the pressure field in the tube was obtained. Finally, an engineering model that can attenuate the shock wave overpressure peak in high-pressure tube with variable section is established by dimensional analysis method. Results: The results show that the attenuation coefficient of the shock wave decreases with an increasing cross section change rate and the related parameters of the shock wave increase with an increasing initial pressure. Compared with normal temperature and pressure, the maximum increase in the peak overpressure of the shock wave is 11.4%, the maximum increase in the arrival time is 94.2%, and the maximum increase in the impulse is 3.5%. Conclusion: The conclusion of this study is that contracting the tube cross-section within the excitation tube driving section can effectively enhance the intensity of the shock wavefront. The combined high-pressure air and explosive driving method can effectively increase the energy of the driving section. Moreover, the higher the initial pressure of air, the higher the energy at the exit of the excitation tube. The results obtained can be used for simulation analysis of explosion shock waves. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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