Elongating arc plasma jet ignition device

Abstract

Disclosed is an elongating arc plasma jet ignition device. A swirler is fixed to the bottom of an inner cavity of a shell; a positive pole is located in the shell and fixedly connected with the swirler; the lower end of an insulation sleeve is installed in a central hole of the swirler, and an air chamber is formed in the gap between the outer peripheral surface of the middle of the insulation sleeve and the inner surface of the shell. A negative pole is embedded on a negative pole installation base, and the arc end of the negative pole extends out of the lower end of the insulation sleeve to be located in the positive pole. An arcing distance 2-8 mm long is kept between the arc end of the negative pole and a nozzle of the positive pole; an air inlet pipe is located at the upper end of the shell and communicated with the space of the air chamber formed between the insulation sleeve and the shell. The taper angle beta of the arc end of the negative pole is 40 degrees. The taper angle alpha of a contraction section of the positive pole is 60-90 degrees. Eight swirling holes with the spiral angle of 45 degrees are evenly distributed in an end surface of the swirler, and work media passing through the swirler generate swirling flow. The elongating arc plasma jet ignition device has the advantages of being high in flame spreading speed, high in penetrating power and rich in 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 severe 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 reliabil...

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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