Ignition device for liquid ramjet

Abstract

The invention discloses an ignition device for a liquid ramjet engine. The ignition device comprises an igniter, an oil supply pipe, a gas supply pipe, a front shell, a rear shell, an expanding pipe and a flame stabilizer. The front shell and the rear shell are fixedly connected, and the igniter is arranged at the joint of the front shell and the rear shell and can be conveniently mounted. The oil supply pipe penetrates through the outer wall of the front shell, stretches into the front shell and is fixedly connected with the igniter. The gas supply pipe penetrates through the outer wall of the front shell, stretches into the front shell and is fixedly connected with the igniter. The expanding pipe is fixedly connected with the igniter. The flame stabilizer is fixedly connected with the expanding pipe. According to the ignition device, it can be guaranteed that a pioneer torch which is not prone to extinguishing is formed in the ramjet engine under the high-speed air flow condition, and the torch is used for igniting oil-gas mixtures in a combustion chamber so that the engine can normally work.

Description

technical field [0001] The invention belongs to the technical field of ramjet engines, in particular to an ignition device for a liquid ramjet engine. Background technique [0002] A ramjet is an aeroengine with a simple structure, and its structure is generally composed of an air inlet, an ignition device, a combustion chamber, a flame stabilizer, and a nozzle. Due to the advantages of light weight and low cost, the ramjet engine is widely used as the power device for the cruising stage of the aircraft. Ignition device is an essential part set in the combustion chamber of liquid fuel ramjet engine for reliable ignition and stable combustion. [0003] As far as the widely used spark plug igniter is concerned, its advantages are: simple equipment and high frequency; its disadvantages are: low ignition energy, only suitable for igniting gaseous fuel or atomized liquid fuel, low temperature of oil-gas mixture, The ignition area is small, and when there are pollutants between ...

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Problems solved by technology

[0003] As far as the widely used spark plug igniter is concerned, its advantages are: simple equipment and high frequency; its disadvantages are: low ignition energy, only suitable for igniting gaseous fuel or atomized liquid fuel, low temperature of oil-gas mixture, The ignition area is small, and when there are pollutants between the electrodes, it is easy to cause ignition failure. When the gas flow rate is too high, it is difficult to ignite or it is easy to extinguish

[0004] Li Qing, Pan Yu, Tan Jianguo, etc. published in the "Comparative Analysis of the Performance of Flame Stabilizers with V-groove and V-grooves in Subcombustible Ramjet Engines [J]" (Journal of Aerodynamics, 2010, 25(01):35-40.) An ignition device for a liquid ramjet engine is developed. Its working principle is to first use a spark plug to ignite a hydrogen-oxygen mixture, and then use a gas flame to ignite the fuel-gas mixture. The ignition success rate has been improved, but an additional set of hydrogen is required. The supply device greatly increases the complexity of the structure

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