多喷嘴燃烧室三维热声不稳定性分析
收稿日期: 2025-01-26
修回日期: 2025-02-24
录用日期: 2025-04-02
网络出版日期: 2025-04-17
基金资助
国家自然科学基金(52406037)
Three-dimensional thermoacoustic instability analysis in a multi-nozzle combustor
Received date: 2025-01-26
Revised date: 2025-02-24
Accepted date: 2025-04-02
Online published: 2025-04-17
Supported by
National Natural Science Foundation of China(52406037)
热声不稳定性是影响航空发动机和地面燃气轮机中多喷嘴燃烧室安全稳定运行的关键问题。为深入理解和控制这一现象，采用三维格林函数方法描述多个喷嘴之间的几何结构和热源响应特征差异，旨在揭示影响三维热声不稳定性的关键参数以及组合不同类型喷嘴的控制效果。重点分析了燃烧室平均温度、喷嘴轴向长度、喷嘴进口边界条件对周向、径向以及轴向模态热声不稳定性的影响规律。结果表明，当喷嘴轴向长度接近1/4波长的奇数倍时，热声不稳定性的状态会缓慢变化；而当接近1/2波长的整数倍时，热声不稳定性的状态会发生突变。此外，喷嘴进口边界条件通过改变进口处的声能传递以及声压与非定常热释放率之间的相位差，共同影响模态的稳定性。基于关键参数的影响规律，通过调整部分喷嘴的几何结构和热源响应，可以有效控制不稳定模态；且多参数同步调整可以在更宽泛的参数范围内有效控制轴向一阶模态的热声不稳定性。
黄忆莎 , 王晓宇 , 秦蕾 , 张光宇 , 程荣辉 , 孙晓峰 . 多喷嘴燃烧室三维热声不稳定性分析[J]. 航空学报, 2025 , 46(18) : 131843 -131843 . DOI: 10.7527/S1000-6893.2025.31843
Thermoacoustic instability poses a significant challenge to the operational safety and stability of multi-nozzle combustors in both aero-engines and industrial gas turbines. To achieve a comprehensive understanding and effective control of this phenomenon， this paper employs a three-dimensional Green's function method to characterize the geometric and thermal response differences among multiple nozzles， aiming to reveal the key parameters influencing three-dimensional thermoacoustic instability and the control effects of combining different types of nozzles. The study focuses on analyzing the impact of the average temperature of the combustion chamber， axial length of nozzles， and inlet boundary conditions of nozzles on the azimuthal， radial， and axial modal thermoacoustic instability. The results indicate that when the axial length of nozzles approximates an odd multiple of a quarter wavelength， the thermoacoustic instability evolves gradually； in contrast， when the length approaches an integer multiple of a half wavelength， an abrupt shift in the instability state occurs. Moreover， the inlet boundary conditions of nozzles affect the stability of thermoacoustic modes by altering the acoustic energy dissipation at the inlet and the phase difference between sound pressure and unsteady heat release rate. By leveraging the identified patterns of key parameters， adjusting the geometric structure and heat source response of some nozzles can effectively control three-dimensional unstable modes. Moreover， coordinated adjustments of multiple parameters can significantly enhance the control of first-order axial mode thermoacoustic instability across a broader parameter spectrum.
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