氢含量对微预混火焰热声不稳定性的影响  

Effect of Hydrogen Content on Thermoacoustic Instability of Micromix Flames for Gas Turbine Applications

作　　者：毕笑天 撒博文 王中豪 扈学超 邵卫卫[1,2] 张哲巅 BI Xiaotian;SA Bowen;WANG Zhonghao;HU Xuechao;SHAO Weiwei;ZHANG Zhedian(Key Laboratory of Advanced Energy and Power(Institute of Engineering Thermophysics,Chinese Academy of Sciences),Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China)

机构地区：[1]先进能源动力重点实验室(中国科学院工程热物理研究所),北京市海淀区100190 [2]中国科学院大学,北京市石景山区100049

出　　处：《中国电机工程学报》2025年第2期433-442,I0002,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家科技重大专项(J2019-Ⅲ-0018-0062);中国科学院青年创新促进会项目(Y2021054)。

摘　　要：为了获得氢含量对微预混燃烧热声耦合的影响,该文开展不同氢-甲烷比例下的燃烧热声不稳定实验研究。通过火焰化学自发光图像研究氢含量从0%到100%的燃料燃烧时时均和瞬态的火焰结构,通过脉动压力研究动态特性,并使用时滞分析方法对热声耦合特性进行分析。结果表明,氢含量为10%的工况点发生了热声不稳定,且此时在火焰根部发生大面积的熄火和再点火,火焰抬升距离剧烈变化。理论分析得到氢含量为10%的工况点下既满足燃烧器声学一阶纵向固有频率,又满足Rayleigh准则要求的时滞条件,符合发生热声不稳定的条件。化学反应时滞在总时滞中占比至少约65%,这表明化学反应时滞在热声振荡分析中扮演重要角色,预热温度、当量比等影响化学反应时滞的因素对于热声不稳定现象有重要影响。研究结果可用于指导微预混燃烧器设计,通过时滞调整进行热声振荡被动控制。In order to investigate the effect of hydrogen content on thermoacoustic coupling in micromix combustion,this paper conducts experimental studies on combustion thermoacoustic instability under different hydrogen-methane ratios.The time-averaged and transient flame structures of flames with hydrogen contents ranging from 0%to 100%are studied through the flame structure,and dynamic characteristics are studied through the dynamic pressure.Time lag analysis method is performed to analyze the thermal acoustic coupling characteristics.The results show that thermoacoustic instability occurrs at the operating point with a hydrogen content of 10%,and a large area of blowoff and reignition occurrs at the root of the flame,resulting in a drastic change in the flame lift-off distance.Theoretical analysis shows that at the operating point with a hydrogen content of 10%,both the first order acoustics longitudinal natural frequency of the burner and the time lag condition required by the Rayleigh criterion are reached,meeting the condition when thermoacoustic instability occurs.In this study,the chemical reaction time lag accounts for at least 65%of the total time lag,indicating that the chemical reaction time lag plays an important role in thermoacoustic oscillation analysis.Factors such as preheating temperature and equivalence ratio that affect the chemical reaction time lag have a significant impact on thermoacoustic instability.The research results of this article can be used to guide the design of micromix burners for passive control of thermoacoustic instability through time lag adjustment.

关 键 词：燃气轮机燃烧 氢微混火焰 火焰结构 热声不稳定 时滞分析 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]