An Elongated Arc Plasma Jet Igniter

Abstract

An elongated arc plasma jet igniter, the swirler is fixed at the bottom of the inner cavity of the casing; the anode is located in the casing and is fixedly connected with the swirler; the lower end of the insulating sleeve is installed in the center hole of the swirler, and insulated The gap between the outer peripheral surface of the middle part of the sleeve and the inner surface of the housing forms an air chamber. The cathode is embedded on the cathode mounting base, and the arc end of the cathode protrudes from the lower end of the insulating sleeve and is located in the anode; the arc end of the cathode is kept at a discharge distance of 2-8mm from the anode nozzle; the air intake pipe is located in the casing The upper end communicates with the air chamber space formed between the insulating casing shells. The cone angle β at the end of the cathode arc is 40°. The cone angle α of the anode shrinkage section is 60-90°. Eight swirl holes with a helix angle of 45° are evenly distributed on the end face of the cyclone, so that the working medium passing through the cyclone generates swirl. The invention has the characteristics of high flame propagation speed, strong penetrating power and rich active air plasma.

Description

technical field [0001] The invention relates to plasma ignition and combustion enhancement technology in the field of energy and power, in particular to an elongated arc plasma jet igniter. Background technique [0002] With the rapid development of the field of energy and power, higher requirements are put forward for ignition and combustion enhancement technology under harsh conditions. At present, the ignition device in the combustion chamber in our country has low ignition energy, and the ignition arc cannot be elongated. It is difficult to meet the requirements of reliable ignition and combustion enhancement technology for engines in the field of modern energy and power under the harsh conditions of wide parameter changes. [0003] In the 1970s, the plasma jet ignition technology, which attracted widespread attention from experts from various countries, has the characteristics of high ignition energy and strong flame penetration, which can improve the ignition reliabili...

AI Technical Summary

Problems solved by technology

However, the above-mentioned plasma igniters have the characteristics of large volume and weight, complex structure, high electrode temperature, short life, low ignition energy, and low working environment pressure.

In view of the above characteristics, the Air Force Engineering University proposed an air swirl plasma igniter for aero-engines in 2013. The patent application number is CN201310084697. The igniter has the characteristics of small size and weight, simple structure, and convenient use and maintenance. The arc root of the igniter is not elongated to the outer wall of the anode channel, which will cause serious ablation of the electrode and reduce the working reliability of the igniter

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