Injector structure capable of preventing body from being overheated

Abstract

A combined design scheme of an eccentric injection unit and a coaxial injection unit is adopted, the mixing ratio of the near wall face side of a fuel gas generator is reduced, the problem that the wall face of the fuel gas generator is prone to ablation and bluing is solved, the injector structure can adapt to the extremely severe environment of high temperature and high pressure, and the service life of the fuel gas generator is prolonged. And the working reliability of the fuel gas generator with the single-wall non-cooling structure is realized. The invention has already been applied to a certain liquid hydrogen and liquid oxygen rocket engine, can also be applied to various fields such as liquid oxygen methane rocket engines, aero-engines and oil burning boilers, and is simple in structure, easy to popularize and low in cost.

Description

technical field [0001] The invention relates to an injector structure for preventing body overheating, which is used in the technical field of rocket engines. Background technique [0002] The gas generator is a key component of the rocket engine. Its function is to mix the propellant in an appropriate proportion and inject it into the combustion chamber for combustion. The high-temperature gas (about 800-900K) generated will then drive the turbo pump to do work. The body of the gas generator generally adopts a single-wall uncooled structure, so the choice of the structure of the injector of the gas generator is very important for the thermal protection of the body. The injector of the gas generator is generally brazed by a number of nozzles, a bottom, and the base of the injector. The traditional nozzle, the oxygen nozzle and the fuel nozzle have a coaxial structure, and the theoretically formed nozzle annular gap is uniform, but in the actual production process, the gas g...

AI Technical Summary

Problems solved by technology

The traditional nozzle, the oxygen nozzle and the fuel nozzle have a coaxial structure, and the theoretically formed nozzle annular gap is uniform, but in the actual production process, the gas generator from the nozzle state to the final state will go through a series of welding processes , the welding process is easy to cause the annular gap of the nozzle to be uneven, especially the annular gap near the wall of the outermost nozzle is too small, resulting in a high mixing ratio near the wall, resulting in local high temperature, which can easily lead to blue or even Ablation and other problems are very detrimental to the thermal protection of the body

Therefore, the ordinary injector design structure is difficult to meet the extreme and harsh working environment of the gas generator

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