Needle valve injector for variable thrust rocket engine

Abstract

The invention belongs to a needle valve injector for a rocket engine, and provides a needle valve injector for a variable thrust rocket engine in order to solve the technical problem of low combustion efficiency caused by poor mixing of propellants in an inner ring and propellants in an outer ring in an existing needle valve injector. The outer wall of the upper section of a needle valve cooperates with the inner wall of a shell so that the needle valve can linearly move relative to the shell, the lower section of the needle valve comprises a conical section and a column section, the small end of the conical section is connected with the column section, a gap is reserved between the outer wall of the tail end of the small end of the conical section and the shell to form an annular oxidant outlet channel, and a fuel outlet channel is formed in the side wall of the column section. A center rod comprises a connecting rod and a flow control boss, the connecting rod is connected with an upper cover, the outer wall of the flow control boss cooperates with the inner wall of the column section so that the needle valve can linearly move relative to the flow control boss, a cooling groove is formed in the side wall of the flow control boss, and the oxidant outlet channel, the fuel outlet channel and the cooling groove all communicate with a combustion chamber.

Description

technical field [0001] The invention belongs to a needle valve injector for a rocket engine, in particular to a needle valve injector for a variable thrust rocket engine. Background technique [0002] The rocket engine is a device that provides power for the flight, orbit change, and attitude adjustment of the launch vehicle. In recent years, in order to reduce costs, more and more commercial aerospace companies have proposed reusable vehicle solutions. In order to achieve rocket recovery, adjustable thrust has become a necessary capability for reusable launch vehicle engines. At present, needle valve injectors are mainly used at home and abroad to realize thrust adjustment. [0003] Such as figure 1 In the existing needle valve injector, the needle valve is designed to be movable. In the process of changing the thrust, according to the change of the flow rate, it is driven by the actuator to change the injection of the inner ring propellant and the outer ring propellant a...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the propellant in the inner ring and the propellant in the outer ring of the existing needle valve injector are poorly mixed, resulting in low combustion efficiency, the present invention provides a needle valve injector for a variable thrust rocket engine. injector

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