Liquid oxygen kerosene pintle injector

Abstract

The present application relates to the field of space propulsion technology, in particular to a liquid oxygen kerosene needle injector. The liquid oxygen kerosene pintle injector includes a shell, an adjustment cylinder and a center rod; the adjustment cylinder is sleeved outside the center rod, and the first liquid injection outlet is formed between the adjustment cylinder and the center rod, and the kerosene flows into the first liquid injection outlet through the first liquid injection outlet. Combustion chamber; the casing is set outside the regulating cylinder, and the second liquid spray outlet is formed between the casing and the regulating cylinder, and the liquid oxygen flows into the combustion chamber through the second liquid spray outlet; the central rod is connected with the casing, and the regulating cylinder can be relatively The central rod and the housing move axially so that the cross-sectional areas of the first liquid spray outlet and the second liquid spray outlet change synchronously. In the liquid oxygen kerosene pintle injector provided by this application, when the adjustment cylinder moves, the cross-sectional areas of the first liquid injection outlet and the second liquid injection outlet change synchronously, and the momentum of the injected kerosene and liquid oxygen can be changed synchronously, thereby It can keep the momentum ratio at the best state during the thrust change, thus improving the injection performance.

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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