|M.Sc Student||Dekel Veksler|
|Subject||Strong Shock Wave Generation Using Underwater Electrical|
|Department||Department of Physics||Supervisors||Full Professor Krasik Yakov|
|Professor Emeritus Felsteiner Joshua|
|Full Thesis text|
The purpose of the present research was to investigate an underwater electrical wire explosion (UEWE), namely to determine the efficiency of conversion of the electrical energy deposited into the exploding wire or wire array into the mechanical energy of the generated water flow. The research has been carried out using two different high-current setups, one setup for exploding the wire in microsecond (ms) time scale and the other setup was used for sub-microsecond (sub-ms) UEWE. The ms timescale experiments were carried out using a generator with stored energy of 2.4 kJ, maximum short circuit current of I=74kA and current quarter period of 3.5ms (dI/dt=2.1?1010A/s). The maximal current density (j) that was obtained during ms UEWE is ~2.2?107A/cm2.
The sub-ms timescale experiments were carried out using a generator with stored energy of 4.3kJ, maximum short circuit current of I = 400 kA and current quarter period of 1ms (dI/dt=4?1011A/s). The maximal current density (j) that was obtained during sub-ms UEWE is ~8?107A/cm2.
Pressure and velocity measurements of the generated SSW were carried out using optical fast streak camera and/or frame photography. Hydrodynamic simulations were extensively used to supplement the experimental data.