Novel pintle type injector for liquid rocket engine

Abstract

The invention discloses a novel pintle type injector for a liquid rocket engine. The novel pintle type injector for the liquid rocket engine comprises an injector shell connected with a combustion chamber body part, a needle valve for isolating two propellants before the two propellants enter a combustion chamber, a support plate for fixing a pintle, and the pintle forming an inner ring channel together with the needle valve; an outer nozzle is formed between the injector shell and the outer conical surface of the needle valve; an inner nozzle is formed between the inner conical surface of the needle valve and the pintle; acute angles are formed between the injection directions of the two propellants after passing through the respective nozzles and the axis of a thrust chamber; by adjusting the two acute angles, the combined momentum direction of the two propellants after collision can be greatly adjusted, then a high-performance working point is obtained due to adjusting, and meanwhile, the device has the advantages of being simple in structure and low in cost.

Description

technical field [0001] The invention belongs to the aerospace field, in particular to a liquid rocket engine. Background technique [0002] The pintle injector liquid rocket engine has the advantages of simple structure, convenient adjustment, stable combustion, high reliability and low cost, and has received more and more attention, especially in the field of commercial aerospace. However, the existing pintle injectors all have a common feature. The propellant in the inner ring is injected radially from the inside to the outside in the thrust chamber, and the propellant in the outer ring is injected along the axis of the combustion chamber after passing through the needle valve. The two angles are fixed. , it is difficult to greatly adjust the direction of the resultant momentum after the impact of the propellant. Sometimes the pressure drop of the two propellants needs to be quite different, and at the same time, it is prone to ablation, which limits its application to a c...

AI Technical Summary

Problems solved by technology

However, the existing pintle injectors all have a common feature. The propellant in the inner ring is injected radially from the inside to the outside in the thrust chamber, and the propellant in the outer ring is injected along the axis of the combustion chamber after passing through the needle valve. The two angles are fixed. , it is difficult to greatly adjust the direction of the resultant momentum after the impact of the propellant. Sometimes the pressure drop of the two propellants needs to be quite different, and at the same time, it is prone to ablation, which limits its application to a certain extent.

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