A self-excited jet spark igniter

Abstract

The invention provides a self-excitation jet spark igniter. The appearance of the self-excitation jet spark igniter is identical to that of a conventional igniter. The self-excitation jet spark igniter comprises a metal outer shell (201), an insulator (202), discharge electrodes including an external discharge electrode pair (203) and an internal electrode pair (301), a wire (204) and a jet hole (205). By the self-excitation jet spark igniter, reliability in re-ignition in a combustion chamber under upper-air extreme conditions can be effectively improved. Compared with conventional electric spark discharge ignition, the self-excitation jet spark igniter has advantages that stable strong-penetration jet sparks can be generated to form a large heating area, and accordingly initial fire corein ignition can be effectively increased, spark penetration depth is increased, the ignition performance is improved, and the strong-penetration jet spark igniter free of a gas source is provided foraviation re-ignition.

Description

technical field [0001] The invention belongs to the design field of aero-engine combustion chambers, and in particular relates to a self-excited jet spark igniter, which is suitable for reliable ignition in aero-engine combustion chambers under extreme conditions at high altitudes. Background technique [0002] When the flight altitude of military aircraft exceeds 11km, the engine faces low-temperature, low-pressure, and low-density atmospheric conditions; at the same time, the Mach number of UAV flight decreases during high-altitude and long-endurance, resulting in a decrease in the air flow through the engine. These special flight conditions have many adverse effects on engine operation, such as the reduction of compressor surge margin, the deterioration of fuel nozzle atomization effect, etc., which in turn leads to the deterioration of engine stability. However, in order to maintain the stability of the drone's altitude and speed, the engine must be frequently manipulate...

AI Technical Summary

Problems solved by technology

The increase in the demand for ignition capability and the decrease in the supply of ignition capability have resulted in insufficient high-altitude ignition capabilities of aero-engine igniters

Under the extreme conditions of high altitude, low temperature and low pressure, after the engine is turned off, it is difficult for conventional electric spark igniters to achieve effective ignition

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