摘要
本文在贫预混燃烧容易诱导热声不稳定产生的背景下,采用大涡模拟结合系统辨识的方法,对甲烷燃料掺氢以及不同火焰筒限制两种情况下的贫预混火焰动力学进行了相关分析。之后通过得出的火焰传递函数,采用低阶网络模型的方法对系统进行了稳定性分析。研究结果表明:加入氢气后,明显增大了火焰的频响,同时火焰相位差减小;在一定的频率范围内,火焰更容易捕捉到不同火焰筒限制对响应的影响;通过采用不同的火焰筒限制,可以修改系统的稳定性行为。
Under the background that lean premixed combustion is easy to induce thermoacoustic instability, Large Eddy Simulation combined with System Identification method is used to analyze the dynamics of lean premixed flame in the case of hydrogen mixing of methane fuel and different combustor confinement. Then, the stability of the system is analyzed by the flame transfer function obtained and the method of low-order network model. The results show that the frequency response of the flame increases obviously and the phase difference of the flame decreases with the addition of hydrogen. In a certain frequency range, the influence of different combustor confinement on the response can be easily captured by the flame. The stability behavior of the system can be modified by using different flame tube restrictions.
作者
王博涵
孙潇峰
姜磊
胡宏斌
聂超群
Wang Bohan;Sun Xiaofeng;Jiang Lei;Hu Hongbin;Nie Chaoqun(Laboratory of Advanced Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;Qingdao Haier Ririshun Logistics, Shandong Qingdao 266101, China)
出处
《燃气轮机技术》
2019年第3期34-40,共7页
Gas Turbine Technology
关键词
系统辨识
火焰传递函数
低阶网络模型
热声不稳定
system identification
flame transfer function
low-order network model
thermoacoustic instability
