预混火焰中热声振荡非线性特征的实验研究  

Nonlinear Characteristics of Thermoacoustic Oscillation in Premixed Flame

作　　者：吉龙娟 李德立 胡光亚 张玮杰 王金华[1] 黄佐华[1] Ji Longjuan;Li Deli;Hu Guangya;Zhang Weijie;Wang Jinhua;Huang Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《燃烧科学与技术》2024年第2期119-127,共9页Journal of Combustion Science and Technology

基　　金：国家科技重大专项资助项目(J2019-Ⅲ-0020-0064,J2019-Ⅲ-0014-0058);陕西省科技创新团队基金资助项目(2021TD-22).

摘　　要：针对旋流预混火焰热声不稳定性开展了实验研究.主要关注当量比对热声振荡系统非线性动力学行为的影响规律.实验结果表明,随着当量比从贫燃向富燃增大,火焰发生了Hopf分岔,火焰也经历了稳定燃烧、准周期振荡(拍振)、极限环振荡、准周期振荡以及稳定燃烧的模态转变过程.长燃烧室中火焰宏观结构的转变伴随着火焰动态模式的改变.当发生极限环振荡时,声压-火焰-涡流耦合作用致使反应区表现出大幅度的周期对流运动.The thermoacoustic instability of a swirling premixed flame was investigated experimentally.The influence of equivalence ratio on the nonlinear dynamic behavior of thermoacoustic oscillation system was mainly concerned.The experimental results show that with the increase of equivalence ratio from lean to rich combustion,Hopf bifurcation occurs to the flame,which undergoes the mode transition from stable combustion,quasiperiodic oscillation(beating oscillation),limit cycle oscillation,quasi-periodic oscillation,to stable combustion.The transition of the flame macrostructure in the long combustion chamber is accompanied by a change in flame dynamic mode.When the limit cycle oscillation occurs,the coupling effect of vortex/flame/acoustics causes the reaction zone to exhibit a large-scale periodic convective motion.

关 键 词：非线性动力学 HOPF分岔 热声不稳定 旋流预混火焰 火焰结构 

分 类 号：TK16[动力工程及工程热物理—热能工程]