轴向分布热源激励下的Rijke型热声不稳定性的仿真研究  

Numerical study of Rijke-type thermoacoustic instability excited by axially-distributed heat sources

作　　者：孙宏权 张浩[1] 李新艳 王宁飞[1] SUN Hongquan;ZHANG Hao;LI Xinyan;WANG Ningfei(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《火箭推进》2025年第1期168-176,共9页Journal of Rocket Propulsion

基　　金：国家自然科学基金(52006012)。

摘　　要：热声不稳定性是发生在燃烧室内由燃烧释放的热脉动和燃烧室内声场之间相互耦合而产生的一种高幅自激振荡,可能对燃烧室结构造成严重地破坏。通过数值仿真方法,建立了Rijke型热声系统模型,重点研究了轴向热源分布特性对系统热声不稳定性非线性行为的影响。结果表明,轴向热源的宽度及其在燃烧室中的分布位置对于热声系统的失稳行为具有显著的调节作用。具体而言,热源宽度越小,系统倾向于经历亚临界Hopf分岔,进而导致失稳。此外,研究结果表明,存在一个特定的热源宽度和轴向位置,使热声振荡的幅值达到最大。这些发现对深入理解热声不稳定性的物理机制、预测其发展过程及优化燃烧室设计具有重要的理论及实际意义。Thermoacoustic instability is a critical phenomenon in high-amplitude self-excited oscillation that occurs in the combustion chamber due to the coupling between the thermal pulsation released by combustion and the sound field in the combustion chamber.This problem may potentially cause severe damage to the combustion chamber structure.A Rijke thermoacoustic system model is established using the numerical method,and the influence of axially-distributed heat source characteristics on the nonlinear instability behavior of the thermoacoustic system is studied.The results demonstrate that the width of the axial heat source and its distribution position within the combustion chamber plays an important role in the instability behavior of the thermoacoustic system.Specifically,as the heat source width decreases,the system is more prone to subcritical Hopf bifurcation.Furthermore,there is a specific heat source width and axial position that maximize the amplitude of thermoacoustic oscillation.These findings would provide further understanding of the physical mechanism,accurate prediction and optimizations of safe combustion chamber design.

关 键 词：热声不稳定 Rijke型热声系统 分布热源 Hopf分岔 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]