Computational and Experimental Study of Detonation Propagation in TATB-Based Cylindrical Charges

A detonation propagation process in a charge made of a plastic-bonded triamino-trinitrobenzene-based explosive composition in the form of a hollow cylinder with a steel shell inside is studied in the case where normal detonation is initiated along a line on the outer surface of the charge. The shape of a detonation wave front at certain times is determined using the X-ray method. Electric contact sensors are applied to measure the detonation wave front propagation velocity along the outer surface of the charge. The original arrangement of the experiments makes it possible to study detonation propagation at angles greater than 180 degrees from the initiation line. It is shown that the front velocity of the diverging detonation wave in the initiation plane is \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\approx$$\end{document}7.3 km/s. In the shadow region of the initiation point, the front velocity of the diverging detonation wave decreases as a function of a distance traveled both along the outer and inner surface of the charge (up to \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\approx$$\end{document}6 km/s and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\approx$$\end{document}5.6 km/s, respectively). At the same time, there is a zone of unreacted triamino-trinitrobenzene near the steel shell in the region where the rotation angles of the detonation wave front range from approximately 150 to 210 degrees. This may indicate detonation failure and transformation into a shock wave. The process is numerically simulated using the SURF detonation kinetics model implemented in MIMOSA. The calculation results are in good agreement with experimental data both at the early stage of the detonation initiation process and in the shadow region of the initiation point, where the detonation wave front velocity drops.