A Multi-channel Igniter with Variable Arc Length

Abstract

A multi-channel igniter with variable arc length is composed of an insulator (101), a discharge chamber (102), an igniter shell (103), and discharge electrodes (201-205). The insulator (101) is installed inside the igniter housing (103); the front end of the insulator (101) is processed with a "C" shaped groove concentric with itself to form a discharge chamber (102); in the "C" shaped groove along with the insulator ( 101) Machining a plurality of through-holes parallel to the axial direction is used to arrange the discharge electrodes (201-205), and there is a certain gap between the through-holes; the plurality of ignition electrodes (201-205) are arranged at random in height, that is, adjacent to each other. The heights of electrodes protruding from the "C"-shaped cavity are inconsistent; the maximum cross-sectional width of the ignition electrodes (201-205) is not less than the width of the "C"-shaped discharge cavity, so as to ensure that the electrodes separate the discharge cavity. The ignition electrodes of the "igniter" of the present invention are arranged at random in the discharge chamber. The high-pressure gas generated by the discharge changes the position of the arc root, and the extended arc channel can improve the 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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