An ignition device for a liquid ramjet engine

Abstract

The invention discloses an ignition device for a liquid refuel ramjet engine. The ignition device comprises an igniter, an oil supply pipe, a front housing and a rear housing, wherein the front housing and the rear housing are fixedly connected; the igniter is arranged at the joint of the front housing and the rear housing, so that the igniter can be conveniently mounted; and the oil supply pipe penetrates the outer wall of the front housing, extends into the front housing and is fixedly connected with the igniter. The ignition device can form a vanguard torch in the liquid refuel ramjet engine under the high-speed airflow condition, and the torch is utilized to ignite an oil-gas mixture in a main combustion chamber to guarantee normal operation of the liquid refuel ramjet engine.

Description

technical field [0001] The invention belongs to the technical field of ramjet engines, and in particular relates to an ignition device for a liquid ramjet engine. Background technique [0002] A ramjet is an aeroengine with a simple structure, and its structure generally consists 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 common spark plug igniter is widely used, the ignition equipment is simple and the frequency is high, but the ignition energy is low, and it is only suitable for igniting gaseous fuels. For liquid fuels, it needs to be atomized to meet the ignition requirements, and oil and gas The temperature of the mi...

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Problems solved by technology

[0003] As far as the common spark plug igniter is widely used, the ignition equipment is simple and the frequency is high, but the ignition energy is low, and it is only suitable for igniting gaseous fuels. For liquid fuels, it needs to be atomized to meet the ignition requirements, and oil and gas The temperature of the mixture is low and the ignition area of ​​the spark plug is small, all of which lead to the unsatisfactory ignition effect of the spark plug. When there is carbon deposit, oil or water between the electrodes, it is easy to cause ignition failure. Under the condition of high-speed airflow, the spark plug may also fail to ignite or It is the situation that after being ignited, it is blown out, etc.

[0004] Li Qing, Pan Yu, Tan Jianguo, et al. "Comparative analysis of the performance of concave cavity and V-groove flame stabilizers in subcombustible ramjet engines [J]" (Journal of Aerodynamics, 2010,25(01):35-40.) In the first article, hydrogen is used to guide the flame to ignite the ramjet engine. The spark plug first ignites the hydrogen, and uses the hydrogen / air flame to ignite the kerosene / air mixture. The success rate of ignition is improved, but adding another set of hydrogen supply device increases the complexity of the structure.

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