Project
High energy concentration in gas by action of strong stable converging shocks
Project DescriptionThe present project deals with high energy concentration in gases by means of shock wave focusing. This is achieved experimentally in a specially constructed shock tube with an annular cross-section and a specially designed shock convergence chamber. It is well known both from theoretical and experimental investigations that the strength of a converging shock increases drastically as the shock approaches the center of convergence. Extremely high temperatures and pressures may be obtained locally as a result of the shock convergence. The necessary condition for the high energy concentration at the center of convergence is that the shock front preserves its symmetry during the convergence process. In other words the stability of the converging shock front with respect to various flow perturbations is of crucial importance. It is quite remarkable that the cylindrical shape, seemingly the most natural and simple shape of the converging shock front is unstable! One of the main goals of the present project is to investigate both experimentally and numerically the influence of the form and symmetry of the initial converging shock on the final energy concentration at the center of focusing. This involves various methods of controlling the shape and stability of the converging shock.
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