Liquid Nitrogen Cooling System for Scramjet

Abstract

The invention discloses a novel scramjet liquid nitrogen cooling system. The liquid nitrogen system is combined with a super-combustion engine through a thermal structure, and mainly includes: a liquid nitrogen supply device, a high-pressure gas source generation device, an engine casing heat exchange panel, a high-pressure gas collection chamber and a movable nozzle. The liquid nitrogen system mainly performs three tasks: (1) to solve the heat dissipation problem of the super-combustion engine; (2) as a secondary power device, assisting the acceleration and attitude control of the hyper-vehicle; The system provides low temperature and high pressure nitrogen. As a low-temperature refrigerant, liquid nitrogen has a strong heat sink capability, which can fully cool the engine wall, and there is no chemical cracking in the liquid nitrogen cooling process, which is easier to achieve than traditional regenerative cooling, and the reliability and safety of the system are higher. high. At the same time, the ultra-high heat flow on the wall of the scram engine will make the liquid nitrogen fully phase change and expand, providing efficient auxiliary power for the 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 engine is one of the key technologies of hypersonic vehicles, and it always faces an important problem in the development process, that is, the heat dissipation of the engine. Studies have shown that: under the conditions of Mach number 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 cannot withstand such a high temperature. Therefore, effective active cooling of the wall of the scram engine is necessary. Fuel regenerative cooling is currently a relatively recognized form of active engine cooling, but there are still many disadvantages. The defects of using liquid hydrogen fuel as coolant are mainly manif...

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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