Shock Focusing Phenomena by Nicholas Apazidis & Veronica Eliasson

Author:Nicholas Apazidis & Veronica Eliasson
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 3.46Square shock convergence using four 15 mm diameter cylinders to shape the shock. (a) Δt = 0 μs. (b) Δt = 10 μs. (c) Δt = 18 μs. (d) Δt = 20 μs. (e) Δt = 22 μs. (f) Δt = 28 μs. (g) Δt = 31 μs. (h) Δt = 31 μs, reproduced from [42], with permission from Springer

As we saw, the presented experimental method makes it possible to tailor the form of converging shock by placing an array of small cylindrical obstacles in the chamber. The stability and symmetry of the converging shock are essential for its ability to produce high-energy density in gas at the focal region. The extreme conditions in gas are manifested by high pressures and temperatures leading to luminescence of the heated gas core visible to a naked eye. The main purpose of the work by Eliasson et al. [41] was to investigate the connection between the form of the converging shock and light emission levels of the compressed gas experimentally. The annular shock tube facility at KTH, Stockholm, with a central body is shown in the sketch in Fig. 3.47. An optical system consists of a mirror with beam expander and a lens provided for visualization by laser pulses and a schlieren imaging for capturing the form of converging shock fronts.

Fig. 3.47The annular part of the shock tube: 1. inner body with a cone, 2. supports, 3. mirror, 4. beam expander, 5. lens, 6. test section, reproduced from [41], with permission from Springer

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