Liquid-nitrogen cooling system of scramjet engine

Abstract

The invention discloses a liquid-nitrogen cooling system of a novel scramjet engine. The liquid-nitrogen cooling system is combined with the scramjet engine through a heat structure, and the system mainly comprises a liquid nitrogen supply device, a high-pressure air source generation device, an engine casing pipe type heat exchange panel, a high-pressure gas collection chamber and a movable spraying pipe. The liquid-nitrogen system mainly executes three masks including (1) solving the problems in heat dissipation of the scramjet engine; (2) serving as a secondary power device so as to assist a hypersonic vehicle in acceleration and attitude control; and (3) providing low-temperature high-pressure nitrogen for subsystems of cabin environment control, fire prevention and the like. The liquid nitrogen serves as a low-temperature refrigerant so as to have the higher heat sink capacity, the wall face of the engine can be fully cooled, and in the cooling process of the liquid nitrogen, chemical cleavage does not exist; compared with a traditional system, refrigeration cooling is easily achieved; and the reliability and safety of the system are higher. The ultrahigh heat flow of the wall face of the scramjet engine will make the liquid nitrogen to achieve phase changes and expansion sufficiently, and the efficient auxiliary power is provided for an aircraft.

Description

technical field [0001] The invention relates to a novel scramjet liquid nitrogen cooling system, which belongs to the technical field of hypersonic aircraft power. Background technique [0002] The scramjet is one of the key technologies of hypersonic aircraft, and it has always faced an important problem during its development, that is, the problem of heat dissipation of the engine. Studies have shown that at Mach 6 and 12, the total temperature of the airflow at the engine inlet reaches 1650K and 4800K, respectively, and the total temperature in the combustion chamber will be higher, even the most advanced composite materials can not withstand such high temperatures. Therefore, effective active cooling of the walls of the scram combustion engine is necessary. Fuel regeneration cooling is currently a relatively recognized form of active engine cooling, but there are still many drawbacks. The defects of using liquid hydrogen fuel as coolant are mainly manifested in: insuff...

AI Technical Summary

Problems solved by technology

However, the current research field is mainly focused on the direction of vehicle design. Since the ambient temperature is not enough to fully stimulate the available energy of liquid nitrogen, the overall performance of the liquid nitrogen engine is relatively poor.

In terms of aerospace, Japanese scholars developed a liquid nitrogen rocket power plant in 2009, proving the feasibility of applying liquid nitrogen to rocket engines. However, they also faced the problem of insufficient heat source and had to use high-temperature water to drive liquid nitrogen to expand.

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