Plasma jet ignition apparatus

Abstract

A plasma jet ignitor apparatus for generating plasma from a plasma medium and for discharging the plasma as a jet into the combustion chamber of an internal combustion engine. The apparatus has a plug which has electrodes from which an arc is generated. The arc causes the plasma medium which is supplied to the plasma generation cavity to become plasma. The plasma generation cavity is cooperatively arranged with magnetic field generation means, electrode discharging means and plasma medium supply means. The cavity has an inlet opening adjacent the plasma generation location at the bottom of the cavity and an outlet orifice at the top of the cavity. The plasma is ejected as a plasma jet, with a ring vortex structure, from the cavity and through the orifice. The magnetic field generation means is disposed as a magnetic field coil acting on the arc. The magnetic field is created by the discharge of a capacitor at the time of the formation of the plasma in the cavity. The magnetic field accelerates the plasma out of the cavity through the orifice so that the plasma exits as a high velocity jet and achieves effective penetration with low energy expenditure. Timing means are also included for delivering gaseous or liquid plasma medium into the cavity, the discharge of the plasma generating energy and the triggering of the magnetic field.