A variable thrust pintle injector

Abstract

The invention discloses a variable thrust pintle injector, which comprises a center rod, a shell, a base and an axial movement mechanism; Reciprocating movement; the base includes the tail of the circular platform and the sleeve part; the inner flow channel is formed between the sleeve part and the central rod, and the inner flow channel includes the inner flow channel liquid collection chamber, the inner flow channel contraction section and the inner flow channel flare section; the sleeve The inner wall of the head of the cylinder is provided with a shrinking ring, and the inner wall of the head of the shrinking ring is provided with a flared inclined surface, which intersects with the conical surface of the tapered head; an outflow is formed between the sleeve and the shell. channel; the tail of the round table is provided with an inlet of an inner runner and an inlet of an outer runner, the inlet of the inner runner is connected to liquid oxygen, and the inlet of the outer runner is connected to methane; the tail of the round table is sealed and connected to the tail of the shell. The invention can effectively improve the wall-adhering flow phenomenon; at the same time, a pressure chamber is set, so that the center rod can move up and down, realize variable flow adjustment, and improve the working range of the engine.

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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