Propagation of Detonation in a Hollow Cylindrical Charge Made of TATB with Metal Shells during Initiation along a Line on the Generating Surface
E. N. Bogdanov1, A. M. Klimov1,2, G. A. Kozlov1,2, K. N. Panov1,2, A. E. Safronov1, A. A. Sedov1, T. O. Sklyadneva1, M. A. Syrunin1, B. I. Tkachenko1, A. P. Yavtushenko1, A. O. Yagovkin1
1All-Russian Scientific Research Institute of Experimental Physics, Sarov, Russia
2Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, Russia
Keywords: TATB, shock wave, detonation, pulsed radiography, initiation, Kelvin-Helmholtz instability
Abstract
The article presents the results of an experimental study of detonation propagation in a charge made of plasticized TATB-based explosive in the form of a hollow cylinder with an inner copper and outer aluminum shell during normal detonation initiation along a line on the outer surface of the charge. In Experiment 1, the characteristics of detonation propagation under the initiator were investigated using an X-ray diffraction method. It was found that in the initiation plane, the velocity of the diverging detonation wave front was 7.4 km/s. In Experiment 2, using a multi-frame proton accelerator, the shape and position of the detonation wave front were determined at various points in time. The original experimental design made it possible to study detonation propagation at angles greater than 180°C from the initiation line. It was shown that in the "shadow" region of the initiation point, the detonation wave velocity along the inner surface of the TATB charge decreases from 7.4 to 6.5 km/s. At an angle of approximately 90°C from the initiation plane, the development of a Kelvin-Helmholtz instability in the form of repeating periodic disturbances was detected on the surface of the copper shell. A disturbance in the form of a "doubling" of the front was detected at the detonation wave front, originating near the surface of the copper shell and propagating along the front surface as it propagated through the charge. Moreover, not only the detonation wave but also the shock wave reflected from the copper shell exhibited a "double" front. The positions of the shells during expansion and the fronts of the reflected shock waves in the explosion products were recorded. Using a heterodyne interferometer (PDV) method, the velocities of the inner and outer shells were continuously recorded. The obtained data can be used to calibrate numerical models incorporating detonation kinetics and the equations of state of the TATB explosion products. Experimental dependences of the detonation wave front velocity on the front curvature were obtained and compared with data from other authors.
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