气液同轴式喷嘴声学特性数值研究

doi:10.16182/j.issn1004731x.joss.201703020

系统仿真学报 ›› 2017, Vol. 29 ›› Issue (3): 618-623.doi: 10.16182/j.issn1004731x.joss.201703020

气液同轴式喷嘴声学特性数值研究

安红辉¹, 聂万胜²

1.装备学院研究生院,北京 101416;
2.装备学院航天装备系,北京 101416

收稿日期:2015-10-20 修回日期:2015-12-18 出版日期:2017-03-08 发布日期:2020-06-02
作者简介:安红辉(1981-),男,河北衡水,博士生,研究方向为液体火箭发动机燃烧不稳定性;聂万胜(1969-),男,内蒙古,博士,教授,博导,研究方向为液体火箭发动机燃烧不稳定性。
基金资助:
国家自然科学基金(91441123)

Numerical Study of Characteristics of Gas Liquid Coaxial Injector as Acoustic Resonator

An Honghui¹, Nie Wansheng²

1. Department of Postgraduate, Equipment Academy, Beijing 101416, China;
2. Dept. Space Equipment, Academy of Equipment, Beijing 101416, China

Received:2015-10-20 Revised:2015-12-18 Online:2017-03-08 Published:2020-06-02

摘要/Abstract

摘要： 采用线性声学理论,将液体火箭发动机气液同轴式喷嘴分别简化为1/4波长谐振管和1/2一波长谐振管,研究得出常温条件下喷嘴长度和入口射流条件对燃烧室一阶切向声学模态的抑制规律。结果表明：当喷嘴一阶纵向模态频率与需要抑制的燃烧室声学模态频率相等时,对于喷嘴入口射流处于壅塞的状态1/4纵向模态波长长度喷嘴的抑制能力最大;反之,1/2纵向模态波长长度喷嘴的抑制能力最大。两种喷嘴的抑制能力均随喷嘴直径增加而增大。研究结果可为喷嘴长度和入口射流条件优化设计、燃烧室声学振荡抑制提供参考。

关键词: 气液同轴喷嘴, 声谐振管, 声抑制系数, 数值计算

Abstract: The gas-liquid injector of the rocket engine was simplified to a quarter-wave resonator and a half-wave resonator respectively by adopting linear acoustic analysis. Acoustic-damping effect of the length and inlet jet of the injector on the first tangential mode of the chamber was found for ambient condition. It is found that when the first order longitudinal mode frequency of the injector is equal to the acoustic mode frequency of the combustion chamber intended for damping, for the inlet jet is choked, the optimum length of the injector to maximize damping capacity is near quarter of a full wavelength of the first longitudinal mode traveling in the injector with the acoustic frequency intended for damping, on the contrary, the length of the injector is near half of a full wavelength of the first longitudinal mode traveling in the injector. The research results can provide reference for the optimum design of the length and inlet jet of the injectors, and acoustic damping of the combustion chamber.

Key words: gas liquid coaxial injector, acoustic resonance tube, acoustic damping coefficient, numerical calculation

中图分类号:

安红辉, 聂万胜. 气液同轴式喷嘴声学特性数值研究[J]. 系统仿真学报, 2017, 29(3): 618-623.

An Honghui, Nie Wansheng. Numerical Study of Characteristics of Gas Liquid Coaxial Injector as Acoustic Resonator[J]. Journal of System Simulation, 2017, 29(3): 618-623.

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气液同轴式喷嘴声学特性数值研究

Numerical Study of Characteristics of Gas Liquid Coaxial Injector as Acoustic Resonator

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