Multi-channel igniter with variable arc length

Abstract

The invention discloses a multi-channel igniter with a variable arc length. The multi-channel igniter comprises an insulator (101), a discharge cavity (102), an igniter shell (103) and discharge electrodes (201-205), wherein the insulator (101) is installed in the interior of the igniter shell (103); a C-shaped groove which is concentric with the insulator (101) is machined in the front end surface of the insulator (101) to form the discharge cavity (102); a plurality of through holes are machined in the C-shaped groove in a direction parallel to the axial direction of the insulator (101) andused for arranging the discharge electrodes (201-205); certain gaps exist among the through holes; the plurality of ignition electrodes (201-205) are arranged in a high-low staggered manner, that is,the heights of the adjacent electrodes protruding out of the C-shaped cavity are not uniform; and the maximum cross-sectional width of the ignition electrodes (201-205) is not less than the width of the C-shaped discharge cavity to ensure that the electrodes separate the discharge cavity. According to the multi-channel igniter with the variable arc length, the ignition electrodes of the igniter are arranged in the discharge cavity in the high-low staggered manner, the arc root position is changed through high-voltage gas generated by discharging, and extended electric arc channels can improvethe discharge efficiency and increase the discharge energy without increasing the breakdown voltage.

Description

technical field [0001] The invention belongs to the design field of aero-engine combustion chambers, and in particular relates to a multi-channel igniter with variable arc length, which is suitable for reliable ignition in aero-engine combustion chambers under extreme conditions at high altitudes. Background technique [0002] The igniter is an important component of the ignition system of an aero-engine and a key component to realize electrical energy conversion. When the ignition power supply outputs high voltage, the air between the electrodes of the igniter breaks down to form a plasma discharge channel, and the electrical energy passes through the discharge channel, converting the electrical energy into heat energy, generating a high-temperature and high-pressure initial fire core to ignite the aeroengine combustion chamber. The length of the arc channel has an important influence on the discharge characteristics, the longer the arc channel, the higher the discharge eff...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the arc channel of the igniter is limited by the electrode spacing, resulting in short channel length, low discharge efficiency, low energy, and small fire core size. The present invention proposes a multi-channel igniter with variable arc length, through The supercharging effect of discharge heating, without changing the breakdown voltage, changes the arc root position to achieve variable arc length, thereby increasing the arc length

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