Pintle injector

Abstract

The invention provides a pintle injector. The pintle injector comprises a pintle sleeve and a pintle rod, wherein the pintle sleeve and the pintle rod are both of rotor structure, an inner runner which can communicate with a propellant supply pipeline is formed in the pintle rod and along the axial direction of the pintle rod, an inner runner spray hole which communicates with the inner runner is formed in a position on the pintle rod and close to the end portion of the pintle rod, the pintle sleeve coaxially sleeves the pintle rod, and then forms an outer runner of circle structure together with the pintle rod, an outer runner spray ring of circle structure is formed at one end, close to the inner runner spray hole, of the outer runner, a communicating hole is formed in the lateral portion of the pintle sleeve so as to communicate with the outer runner and the propellant supply pipeline, and the communicating hole is tangent to the outer runner. By setting the communicating hole and the outer runner in tangent structure, a propellant after being sprayed out from the outer runner is enabled to have certain radial velocity under the action of centrifugal acceleration, and a radial range of mist spray is effectively broadened, and furthermore a gas channel is formed in the upper stream of the outer runner so as to assist in atomization of the liquid propellant. The pintle injector is used in the space propulsion technology field.

Description

technical field [0001] The invention relates to the technical field of space propulsion, in particular to a needle plug injector. Background technique [0002] The working process of a liquid rocket engine includes injection, atomization, evaporation, chemical reaction and other main processes. Among them, the injector determines the speed, distribution and atomization performance of the propellant entering the combustion chamber, so it has an important impact on the performance of the engine. Needle-bolt injector engines usually use only one needle-bolt nozzle. Compared with traditional engines, it usually requires dozens or hundreds of injection units. It has the advantages of simple structure, depth adjustment ability, and internal combustion stability. It is expected to be widely used in liquid rockets. Engines, especially variable thrust liquid rocket engines. Needle plug injectors usually include a needle plug and an injector base, and are generally divided into two ...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the pintle injector in the prior art are also more obvious, such as: (1) the inlet of the pintle sleeve is a straight hole, and the propellant flows out from the annular seam at a speed basically sticking to the wall and flowing downward, which cannot effectively expand the spray Distribution range; (2) Both propellants are liquid, and only the collision between the liquids is used to achieve crushing and atomization. The atomization effect is greatly affected by the injector structure design and the mixing ratio

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