| 摘要: |
| 为了研究液液同轴离心喷嘴的动态特性，通过理论方法建立了同轴喷嘴中内喷嘴、外喷嘴的传递函数。其中内喷嘴传递函数参考了Bazarov的喷嘴动力学理论。基于非定常伯努利方程，结合压降振荡条件下喷嘴内液体不同速度分量变化量之间关系的分析，推导了外喷嘴的传递函数。通过将内外喷嘴独立的传递函数相结合，获得了同轴喷嘴总流量振荡以及氧燃比振荡的幅频特性。对一具体同轴喷嘴进行了计算，结果表明，内喷嘴在计算频率范围内会出现敏感频率点。在压降振荡同相位情况下，高频时内外喷嘴之间流量振荡相位差较大。通过仅改变内喷嘴或外喷嘴切向孔的数目，对氧燃比1.65，富燃及富氧三种同轴喷嘴整体动态特性进行了分析。三种同轴喷嘴的计算结果中均发现了新的敏感频率点。 |
| 关键词: 液液同轴离心式喷嘴 喷嘴动力学 传递函数 非定常伯努利方程 理论分析 |
| DOI：10.13675/j.cnki.tjjs.210499 |
| 分类号:V434 |
| 基金项目:国家自然科学基金（U1837211）。 |
|
| Theoretical Study on Dynamic Characteristics of Liquid-Liquid Coaxial Swirl Injector |
|
ZHANG Ding-wei1, FU Qing-fei1,2, YANG Li-jun1,2
|
|
1.School of Astronautics,Beihang University,Beijing 100191,China;2.Aircraft and Propulsion Laboratory,Ningbo Institute of Technology,Beihang University,Ningbo 315800,China
|
| Abstract: |
| In order to study the dynamic characteristics of liquid-liquid coaxial swirl injector， the transfer functions of the inner and outer injectors of the coaxial injector were established by theoretical method. The transfer function of the inner injector refers to Bazarov’s injector dynamics theory. Based on the unsteady Bernoulli equation， the transfer function of the outer injector is derived by analyzing the relationship between the change in different velocity components of the liquid in the injector when the pressure drop oscillates. By combining the independent transfer functions of the inner and the outer injectors， the amplitude-frequency characteristics of the oscillations of the total flow rate and the oxygen-fuel ratio of the coaxial injector were obtained. The calculation results of a specific coaxial injector show that there appears sensitive frequency point within the calculated frequency range of the inner injector. The phase difference of flow oscillation between inner and outer injectors is large at high frequency when the pressure drop oscillations of them is synchronous. By only changing the number of tangential holes of the inner injector or the outer injector， the dynamic characteristics of the whole coaxial injector with oxygen to fuel ratio of 1.65， fuel-rich and oxygen-rich were analyzed. New sensitive frequency points were found in the calculation results of the three kinds of coaxial injectors. |
| Key words: Liquid-liquid coaxial swirl injector Injector dynamics Transfer function Unsteady Bernoulli equation Theoretical analysis |
