Liquid oxygen kerosene pintle injector

Abstract

The invention relates to the technical field of space propulsion, in particular to a liquid oxygen kerosene pintle injector. The liquid oxygen kerosene pintle injector comprises a shell, an adjusting cylinder and a center rod. The center rod sleeves outside the adjusting cylinder, a first liquid spraying outlet is formed between the adjusting cylinder and the center rod, and kerosene flows through the first liquid spraying outlet to enter a combustion chamber; the shell sleeves outside the adjusting cylinder, a second liquid spraying outlet is formed between the shell and the adjusting cylinder, and liquid oxygen flows through the second liquid spraying outlet to enter the combustion chamber; and the center rod is connected with the shell, and the adjusting cylinder can move in the axial direction relative to the center rod and the shell so that the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet can be synchronously changed. According to the liquid oxygen kerosene pintle injector, when the adjusting cylinder moves, the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet are synchronously changed, and the momentum of sprayed kerosene and the momentum of sprayed liquid oxygen can be synchronously changed, so that the momentum ratio can be always kept in the optimal state in the thrust changing period, and the injection performance is improved.

Description

technical field [0001] The present application relates to the field of space propulsion technology, in particular to a liquid oxygen kerosene needle injector. Background technique [0002] As an integral part of the rocket engine, the injector is an important factor affecting the performance of the engine. The pintle injector is a movable injector that can adjust the injection area. The pintle injector is divided into two channels. Generally, the central propellant is sprayed along the radial direction, and the peripheral propellant is sprayed along the axial direction. , the two collide at the head of the injector to complete the atomization and mixing of the propellant. [0003] The way of adjusting the injection area of ​​the existing pintle injector is relatively simple, and the injection area of ​​the central channel is changed by moving the pintle body in the center, while the injection area of ​​the peripheral channel generally cannot be changed. When the thrust of ...

AI Technical Summary

Problems solved by technology

[0003] The way of adjusting the injection area of ​​the existing pintle injector is relatively simple, and the injection area of ​​the central channel is changed by moving the pintle body in the center, while the injection area of ​​the peripheral channels generally cannot be changed

When the thrust of the liquid rocket engine is changed in a large range, the injection area needs to be adjusted to control the flow rate of the propellant. When the injection area of ​​the two channels of the injector cannot be changed synergistically, it will cause the engine to change inside and outside when the thrust is changed. The momentum ratio of the propellant changes, which affects the mist mixing effect and affects the combustion efficiency of the engine

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