工况参数对预混燃烧室热声振荡的影响  

Influence of Operating Parameters on Thermoacoustic Oscillations in Premixed Combustor

作　　者：曹炜 杨凯淇 任永杰 郭康康 仝毅恒 黄卫东 聂万胜 Cao Wei;Yang Kaiqi;Ren Yongjie;Guo Kangkang;Tong Yiheng;Huang Weidong;Nie Wansheng(Department of Astronautics and Science and Technology,Space Engineering University,Beijing 101416,China)

机构地区：[1]航天工程大学宇航与科学技术系,北京101416

出　　处：《燃烧科学与技术》2024年第6期590-599,共10页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(12002386).

摘　　要：针对燃气轮机模型燃烧室,实验研究了工况参数变化对热声振荡的影响.实验测量了模型燃烧室内热声耦合过程中的动态压力和CH^(*)表征的释热率,采用高速相机捕获了火焰结构.结果表明,燃烧室动态压力和释热率相位差小于90°,燃烧室内发生了热声振荡;火焰的周期性卷曲会引起释热率的脉动,进而激发热声振荡.当热声振荡发生时,火焰结构和释热强度存在周期性波动,而稳定燃烧时基本保持不变.随着当量比的增大,热声振荡的主频和声压级增大;随着总流量的增大,火焰抬升高度和火焰宽度相应增加,释热区域向燃烧室下游延展.The influence of varying operating parameters on thermoacoustic oscillations was experimentally investigated for a gas turbine model combustor.The dynamic pressure and the heat release rate(HRR)characterized by CH^(*) during the thermoacoustic coupling process in the model combustor were measured.High-speed camera was used to capture the flame structure.The results show that:the phase difference between the dynamic pressure and the HRR in the combustor is smaller than 90°,and that the thermoacoustic oscillations occur in the combustor.The periodic flame roll-up induces the pulsation of HRR,which in turn excites the thermoacoustic oscillations.When the thermoacoustic oscillations occur,there are periodic fluctuations in the flame structure and HRR intensity,which basically remain unchanged during stable combustion.With the increase of the equivalent ratio,the main frequency and sound pressure level of the thermoacoustic oscillations increase.With the increase of the total mass flow rate,the flame lift height and flame width increase accordingly,and the heat release region extends downstream in the combustor.

关 键 词：热声振荡 预混燃烧 当量比 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]