Gas-liquid coaxial shear type nozzle based on lip-mouth saw tooth design

A shearing and sawtooth technology, applied in the field of gas-liquid coaxial shearing nozzles, can solve the problems of reducing the sensitivity of sound and vibration in the injection process, the sensitivity of combustion stability to the length, and the threat to the reliability of the engine, so as to reduce the impact of the injection process. Risk of ablation, improved combustion stability, effect of reduced length

Active Publication Date: 2019-05-21
XIAN AEROSPACE PROPULSION INST
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Problems solved by technology

[0004] However, there are still some problems in the above traditional methods, mainly including: 1) the acoustic vibration sensitivity of the injection process has not been fundamentally reduced, and the shear process of the gas-liquid fuel jet will still be affected by the pressure oscillation of the combustion chamber; 2) the indented The introduction makes the combustion stability very sensitive to its length, and it is difficult to guarantee the stability under variable working conditions; 3) The indentation section itself is easy to form a miniature combustion chamber, causing ablation of the nozzle, which seriously threatens the reliability of the entire engine

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  • Gas-liquid coaxial shear type nozzle based on lip-mouth saw tooth design
  • Gas-liquid coaxial shear type nozzle based on lip-mouth saw tooth design
  • Gas-liquid coaxial shear type nozzle based on lip-mouth saw tooth design

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Embodiment Construction

[0032] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] figure 1 It is a schematic structural diagram of a gas-liquid coaxial shearing nozzle based on a serrated lip design provided by an embodiment of the ...

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Abstract

The invention discloses a gas-liquid coaxial shear type nozzle based on lip-mouth saw tooth design. The gas-liquid coaxial shear type nozzle comprises an outer nozzle and an inner nozzle, the outer nozzle is arranged on the outer surface of the inner nozzle in a sleeving mode, the outer nozzle and the inner nozzle are coaxial, the lip mouth of the inner nozzle is located in the outer nozzle, a plurality of saw teeth are formed in the lip mouth of the inner nozzle in the circumferential direction of the inner nozzle, the inner nozzle is used for circulating the liquid, and the position betweenthe outer nozzle and the inner nozzle is used for circulating the gas. The gas-liquid coaxial shear type nozzle solves the contradiction between improving of the fuel atomization blending mixing efficiency and combustion stability of the gas / liquid coaxial shear nozzle and reducing of the risk of nozzle ablation.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engine gas generators or thrust chambers, and in particular relates to a gas-liquid coaxial shearing nozzle based on lip serrated design. Background technique [0002] In a liquid rocket engine, the propellant injection and atomization process is very critical, mainly reflected in: 1) the atomization and mixing process determines the combustion efficiency; 2) the acoustic vibration response of the injection process is an important link in the formation and maintenance of combustion instability. Therefore, how to reduce the acoustic vibration sensitivity of the injection process and improve the combustion stability on the basis of ensuring the combustion efficiency is a problem of great concern in engineering. [0003] Coaxial shear nozzles are widely used in cryogenic liquid rocket engines and are the preferred injection form for future high-performance full-flow afterburning and reusable li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02K9/52
Inventor 汪广旭谭永华陈建华陈宏玉刘占一薛帅杰石晓波
Owner XIAN AEROSPACE PROPULSION INST
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