Variable thrust pintle injector

Abstract

The invention discloses a variable thrust pintle injector. The variable thrust pintle injector comprises a central rod, a shell, a base and an axial moving mechanism. The central rod is provided witha conical head and can be driven by the axial moving mechanism to do axial reciprocating motion. The base comprises a circular truncated cone tail part and a sleeve part, an inner flow channel is formed between the sleeve part and the central rod and comprises an inner flow channel liquid collecting cavity, an inner flow channel contraction section and an inner flow channel flaring section, a shrinking ring is arranged on the inner wall surface of the head of the sleeve part, and a flaring slope is arranged on the inner wall surface of the head of the shrinking ring and intersects with the conical surface of the conical head. An outer flow channel is formed between the sleeve part and the shell, an inner flow channel inlet and an outer flow channel inlet are formed in the circular truncated cone tail part, the inner flow channel inlet is used for introducing liquid oxygen, the outer flow channel inlet is used for introducing methane, and the circular truncated cone tail part is hermetically connected with the tail of the shell. According to the variable thrust pintle injector, the phenomenon of adherent flow can be effectively improved, a pressure cavity is formed, so that the central rod moves up and down, variable flow adjustment is achieved, and the working range of an engine is widened.

Description

technical field [0001] The invention relates to space propulsion technology, in particular to a variable-thrust pintle injector, which is mainly used in a thrust-adjustable liquid rocket engine combined with liquid oxygen and methane propellant. Background technique [0002] The pintle injector has the advantages of high combustion efficiency, stable combustion, strong applicability, large thrust ratio, simple structure, and low cost. [0003] In the prior art, the pintle injector mainly has the following technical problems, which need to be solved: [0004] 1. If the atomization angle is too small, the liquid sprayed from the inner flow channel cannot be well diffused, and the phenomenon of sticking to the wall is prone to occur, which makes the spray distribution range smaller. [0005] 2. The geometric structure of the pintle injector, especially the opening distance at the outlet, has a great influence on the atomization result. Contents of the invention [0006] The...

AI Technical Summary

Problems solved by technology

[0004] 1. If the atomization angle is too small, the liquid sprayed from the inner flow channel cannot be diffused well, and the phenomenon of sticking to the wall is prone to occur, which makes the spray distribution range smaller

[0005] 2. The geometric structure of the pintle injector, especially the opening distance at the outlet, has a great influence on the atomization result

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