A structure of an axial injection end-firing solid-liquid rocket motor

Abstract

The invention discloses an axial injection end combustion solid-liquid rocket engine structure which comprises an engine head cover, a solid propellant shell, a solid propellant heat insulating layer, end combustion solid propellants, a spray pipe shell and a spray pipe heat insulating layer. The engine head cover is mounted at the front end of the solid propellant shell, the spray pipe shell is mounted at the rear end of the solid propellant shell, the engine head cover is provided with an air inlet channel, the end combustion solid propellants are coaxially arranged in the solid propellant shell, a constant volume cavity is formed between the front end faces of the end combustion solid propellants and the rear end face of the engine head cover, each end combustion solid propellant is provided with a plurality of axial injection holes with small diameters, the flow rate of oxidizing agents in the injection holes is high, and combustion reaction only occurs at the end faces of the end combustion solid propellants; the joint between the solid propellant shell and the engine head cover and the joint between the solid propellant shell and the spray pipe shell are respectively provided with a sealing structure, so that air impermeability of an engine is guaranteed; the heat insulating layers are arranged in the solid propellant shell and the spray pipe shell, so that thermal protection performance of the engine during operation is guaranteed. Thus, performance of the engine is improved, meanwhile the filling fraction of the engine is improved, the slenderness ratio of the engine is reduced, and the application rage of engine is widened.

Description

technical field [0001] The invention relates to the technical field of solid-liquid rocket motors, in particular to an axial injection end-combustion solid-liquid rocket motor structure. Background technique [0002] Compared with the solid or liquid rocket motor widely used at present, the solid-liquid rocket motor uses liquid oxidant and solid fuel as propellant, which has the advantages of low cost, good safety, thrust adjustment and multiple starts, etc. A class of engines with great development potential. [0003] When a typical solid-liquid rocket engine is working, the oxidant enters the grain channel of the engine through the injection panel, and forms a flame layer near the side wall of the grain for combustion. The grain belongs to side combustion. Common charge shapes include round hole, star hole, wheel shape and porous shape. For the side-burning solid-liquid rocket engine, with the increase of the working time of the engine, the area of ​​the charge channel a...

AI Technical Summary

Problems solved by technology

At the same time, a typical side-burning solid-liquid rocket engine usually has a large channel area and a low filling fraction. In order to provide a sufficient combustion area, the length is long and the slenderness ratio is large, which limits its application range to a certain extent.

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