Effect of Swirling Premixed Combustion Confinement Shape on Thermoacoustic Instability

WANG Peng; LIU Aiguo; WU Xiaoqu; YU Tianzhi; WU Kaipi

doi:10.19805/j.cnki.jcspe.2025.240299

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Effect of Swirling Premixed Combustion Confinement Shape on Thermoacoustic Instability

更新时间：2026-10-10

- Effect of Swirling Premixed Combustion Confinement Shape on Thermoacoustic Instability
- Chinese Journal of Power Engineering Vol. 45, Issue 7, Pages: 999-1009(2025)
- 作者机构：
  
  沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室,辽宁,沈阳,110136
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240299
  CLC：
- Online First：14 July 2025，
  
  Published：2025
- 稿件说明：
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王鹏,刘爱虢,吴小取,于天誌,吴开辟. 旋流预混燃烧限制域形状对热声不稳定性的影响动力工程学报, 2025, 45(7): 999-1009 https://doi.

org/10.19805/j.cnki.jcspe.2025.240299
王鹏,刘爱虢,吴小取,于天誌,吴开辟. 旋流预混燃烧限制域形状对热声不稳定性的影响动力工程学报, 2025, 45(7): 999-1009 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240299.

org/10.19805/j.cnki.jcspe.2025.240299 DOI：

摘要

为获得旋流预混燃烧室中限制域形状对热声不稳定性的影响

采用数值模拟的方法

对不同限制域形状内的燃烧振荡机理、三维火焰结构和流场特性进行了研究。结果表明:通过改变燃烧室进口当量比

相比于突扩限制域

斜坡限制域热声不稳定性均得到明显抑制。突扩限制域中的火焰动态结构呈现周期性变化

斜坡限制域中的火焰动态结构基本不变

并且随着斜坡角度的增加

角回流区的面积减小

热声不稳定性得到明显改善

主要原因是斜坡限制域中角回流区的涡旋脱落过程受限

涡旋产生和脱落的强度、频率及涡旋与火焰的接触程度均有所降低

导致涡旋与火焰之间的相互作用减少

包括涡旋对火焰的拉伸、扭曲及火焰对涡旋的加热等物理过程。这种削弱的相互作用减少了燃烧室内的不稳定扰动源

从而有助于抑制热声不稳定性。使用斜坡限制域有潜力成为在宽工况范围内有效抑制热声不稳定的被动控制方法。

Abstract

In order to obtain the influence of confinement shape on thermoacoustic instability in swirling premixed combustion chamber

researches were conducted on the combustion oscillation mechanism

three-dimensional flame structure and flow field characteristics by numerical simulation for the combustion with different confinement shapes. Results show that

by changing the equivalence ratio at the combustion chamber inlet

the thermoacoustic instability is significantly suppressed in slope confinement compared with that in dump confinement. The flame dynamic structure in dump confinement shows periodic changes

while the flame dynamic structure in slope confinement is basically unchanged. With the increase of slope angle

the area of corner recirculation zone decreases

and the thermoacoustic instability is significantly improved. The main reason is that the vortex shedding process of corner recirculation zone in slope confinement is limited

while the intensity and frequency of vortex generation and shedding

and the contact degree between vortex and flame are both decreased

which leads to a decrease in the interaction between vortex and flame

including the physical processes such as the stretching and twisting of vortex on the flame

and the heating of vortex by flame. This weakened interaction reduces the unstable disturbance source in combustion chamber

which is conducive to suppress the thermoacoustic instability. The application of slope confinement may have a potential to become a passive control method to effectively suppress the thermoacoustic instability in a wide operating range.

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references

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