气体入口流量低频脉冲对燃烧稳定性的影响  

Effects of low frequency pulse of gas inlet flowrate on combustion stability

作　　者：徐智康 高瞻[1] 杨卫娟[1] 徐佳琦 刘建忠[1] XU Zhikang;GAO Zhan;YANG Weijuan;XU Jiaqi;LIU Jianzhong(State Key Laboratory of Energy Clean Utilization,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源工程学院能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热科学与技术》2024年第1期53-60,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51976186)。

摘　　要：外部运行因素变化会导致不稳定燃烧现象的发生,严重时甚至引发燃烧室结构损毁。在甲烷与空气当量比为1条件下以非预混燃烧火焰为对象,利用动态压力传感器及光栅光谱仪测量压力与热释放率的变化,通过实验研究气体入口流量低频脉冲(1.000~5.000 Hz)对燃烧稳定性的影响。结果表明入口流量脉冲影响燃烧的稳定性,其中火焰形态、燃烧室压力(p)和热释放率(qi)等会发生同频周期脉动。脉冲频率在2.000~2.500 Hz时对削弱燃烧稳定性影响最大,表现为p和qi出现高的脉动幅值,而1.000 Hz脉冲频率对削弱燃烧稳定性影响最小;脉冲频率对削弱燃烧稳定性的影响随频率增加逐渐从线性向非线性变化。脉冲流量越大,p和qi的脉动幅值越大,燃烧越趋向不稳定燃烧。The change of external operating factors leads to unstable combustion,and combustion chamber structure can be destroyed in severe cases.The non-premixed combustion flame was taken as the object under the condition that the equivalence ratio of methane to air was l,and the dynamic pressure sensor and grating spectrometer were used to measure the changes of pressure and heat release rate.The effects of low-frequency pulse of gas inletflow rate(1.000~5.000 Hz)on combustion stability were analyzed experimentally.Results show that the inletflow pulse affects the combustion stability.The flame shape,combustion chamber pressure(p)and heat release rate(qi)fluctuate periodically at the same frequency.The pulse frequency has the greatest influence on weakening combustion stability in the range of 2.000~2.500 Hz,when p and qi have high pulse amplitude.However,1.0oo Hz pulse frequency has the least effect on weakening combustion stability.The influence of pulse frequency on weakening combustion stability gradually changes from linear to nonlinear with the increase of frequency.It suggests the greater the proportion of pulse flowrate is,the greater the amplitude of p and qi is,with the combustion tending to unstable combustion.

关 键 词：气体射流 脉冲流量 非预混燃烧 时频特性 燃烧稳定性 

分 类 号：TK16[动力工程及工程热物理—热能工程]