摘要
为获得燃烧室头部几何参数对火焰形状及火焰传递函数的作用机制,并预判不同结构下燃烧不稳定发生风险。基于大涡模拟,对控制燃烧室头部形状的四个参数进行了DoE试验设计研究,并通过激励响应法从大涡模拟中辨识了火焰传递函数。结果表明,上述四个参数对A型火焰影响小,C型火焰主要受扩张角影响,B型火焰主要受扩张角与燃烧室半径相互作用影响。火焰传递函数结果表明火焰仅对低频段响应明显。工况5,7和8仅有一100 Hz以下频率带;工况9,14和15仅有一200 Hz以上频率带;其它工况响应频率带有2个以上。燃烧室设计中应规避高火焰传递函数增益的结构设计,以降低燃烧不稳定风险。
To explore the effects of combustor dome structures on flame shapes and flame transfer functions,and to estimate combustion instability risks under different dome geometries,the DoE method based on large eddy simulations was performed on four critical geometric parameters of the combustor dome.Flame transfer functions were identified from large eddy simulation results via the frequency response technique.Results indicated that type-A flames were not influenced by any parameters,type-C flames were controlled by the diffusor angle and type-B flames were influenced by the interactions between the diffusor angle and combustor radius.The flames only responded to low frequency bands.Case 5,7 and 8 only had a frequency band below 100 Hz,while case 9,14 and 15 only possessed a frequency band above 200 Hz.More than two frequency bands were found in other cases.High gains of flame transfer functions need be avoided to reduce the risk of combustion instabilities at the design stage of combustors.
作者
杨旸
余志健
Yang Yang;Yu Zhijian(Nanjing Institute of Future Energy System, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Nanjing 210000, China;Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100190, China)
出处
《燃气轮机技术》
2021年第1期14-20,共7页
Gas Turbine Technology
基金
中科院率先行动百人计划(B类Y9291282U1)。
关键词
预混燃烧室
大涡模拟
火焰传递函数
DoE试验设计
头部结构
premixed combustor
large eddy simulation
flame transfer function
DoE design of experiments
combustor dome structure
