摘要
为了探究次级燃料比例对热声特性的影响,对某型轴向分级燃烧室在高温高压条件下进行了热声稳定性试验。基于试验中在不同运行工况和不同次级燃料比例下获得的压力脉动信号,利用时频域分析方法和相空间重构分析法研究了燃烧室内热声特性的变化趋势。研究结果显示:燃烧室内存在30 Hz、90 Hz的低频振荡和1500 Hz的高频振荡;随着次级燃料比例的增加,主燃区空燃比增加,低频幅值在一定比例后突升,高频幅值整体呈降低趋势。相空间重构结果显示,在高温高压的条件下,燃烧噪声影响严重,虽能观察到极限环结构,但轨迹不平滑。随着负荷的推进,次级燃料比例增加以维持主燃区空燃比的稳定范围基本不变,从而保证了热声状态稳定。
In order to investigate the infuence of the secondary fuel ratio on thermoacoustic char-acteristics,an experimental study on an axially staged combustor under high temperature and high pressure condition was carried out.Based on the dynamic pressure signals obtained under different operating conditions and different secondary fuel ratios during the experiment,the methods of time-frequency analysis and phase-space reconstruction analysis were used to investigate the change of the combustor's thermoacoustic characteristics.The results showed that there were low frequencies of 30 Hz,90 Hz and high frequency of 1500 Hz.With the increase of the secondary fuel ratio,the air-fuel ratio in primary zone increased,the amplitude of low frequencies increased rapidly after a certain ratio,and the amplitude of high frequency decreased.The reconstructed phase plots showed that the impact of combustion noise was critical under high temperature and high pressure condition.Although the limit cycle structure could be observed,the trajectory was not smooth.As the load increased,the secondary fuel ratio increased to maintain the air-fuel ratio in primary zone in the stable region,and then stabilized the thermoacoustic state.
作者
隋永枫
张宇明
臧鹏
傅燕妮
詹长庚
朱涛
邵卫卫
SUI Yongfeng;ZHANG Yuming;ZANG Peng;FU Yanni;ZHAN Changgeng;ZHU Tao;SHAO Weiwei(Zhejiang Rancon Turbine Machinery Co.,LTD,Hangzhou 310027,China;Hangzhou Steam Turbine Co.LTD,Hangzhou 310022,China;Jiangsu Zhongke Research Center for Clean Energy and Power,Lianyungang 222069,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2024年第6期1625-1633,共9页
Journal of Engineering Thermophysics
基金
浙江省重点研发计划(No.2022C01118,No.2023C01137)
中国科学院青年创新促进会(No.Y2021054)。
关键词
轴向分级燃烧室
次级燃料
热声稳定性
相空间重构法
axially staged combustor
secondary fuel
thermoacoustic stability
phase space ana-lysis
