Gas suction type engine cold start system and cold start method

Abstract

The invention relates to a gas suction type engine cold start system. The hidden danger of use safety existing in a flammable material guiding fuel ignition combustion preheating cold start structureand a gaseous fuel combustion preheating cold start structure used in an existing engine are eliminated. The cold start system comprises a gas generator, a gas distribution valve and at least one first fuel injector opening in the inner wall of a combustion chamber and located at the front end of the combustion chamber. The gas generator comprises a gas generating device, a cooling device and a filter, wherein the gas generating device, the cooling device and the filter are connected in sequence. The gas generating device comprises a fuel cavity and a generator igniter, the fuel cavity is provided with solid fuel, and the generator igniter is used for igniting the solid fuel. An inlet of the gas distribution valve is connected with an outlet of the filter, the gas distribution valve is provided with at least one outlet corresponding to the first fuel injectors, and the outlets of the gas distribution valve are connected with the first fuel injectors correspondingly.

Description

technical field [0001] The invention belongs to the field of rocket ramjet combined engines, and relates to a cold start system and a cold start method of an air-breathing engine. Background technique [0002] Scramjet engines and RBCC engines below Ma7 usually use kerosene or endothermic hydrocarbon fuels as fuel. Before the cold start of the engine, the fuel is at normal temperature, and the ignition and combustion organization under supersonic flow conditions are relatively difficult. At present, the cold start of the engine usually adopts the scheme of igniting and burning the fuel guided by flammable substances or burning and preheating with other gaseous fuels. Among them, the cold-start scheme in which flammable substances guide fuel to ignite and burn usually uses gaseous flammable and explosive substances such as silane, which has great safety risks. It is mainly used in ground tests and flight demonstration tests, and there is no engineering application precedent;...

AI Technical Summary

Problems solved by technology

Among them, the cold-start scheme in which flammable substances guide fuel to ignite and burn usually uses gaseous flammable and explosive substances such as silane, which has great safety risks. It is mainly used in ground tests and flight demonstration tests, and there is no engineering application precedent; The cold start scheme of gaseous fuel combustion preheating can increase the fuel temperature and significantly improve the blending and combustion characteristics of the fuel, but the gaseous fuel used is usually an explosive gas such as ethylene, which is stored in a high-pressure cylinder. Storage and Use of Hypersonic Proximity Space Vehicles Poses Safety Concerns

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