Abstract
In this study the feasibility of using a novel adaptation of an electromagnetic source (EMAS) for the production of a pulsed water jet is investigated. This device consists of a high-voltage, 4 to 8-μF, 20-kV capacitor which is discharged through a flat pancake coil. An insulated metal disk is placed in close proximity with the coil and is mounted in a water-filled vessel. Lorentz forces due to the eddy currents induced in the disk accelerate the disk away from the coil. The disk acceleration produces a pressure shock wave which is focused by a convergent reflector onto a nozzle. The reflection of this shock wave from the water–air interface produces a discrete water jet. A theoretical analysis of the electrical characteristics of the transducer is presented. A finite-element package was used to study different convergent reflector shapes. Experimental results from a prototype generator are given, including pressure measurements from a needle hydrophone and shadowgraph photographs of the water jet.
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