稀释气体对火焰闪烁的影响及其非线性特性研究  

Study on Effects of Diluent Gas on Flame Flickering and Its Nonlinear Characteristics

作　　者：嵇铭栋 潘文轩 杨茉[1,2] JI Mingdong;PAN Wenxuan;YANG Mo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Jian Qiao University,Shanghai 201306,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海建桥学院,上海201306

出　　处：《动力工程学报》2021年第12期1069-1074,1089,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51736007,51476103)。

摘　　要：为研究稀释气体对火焰闪烁不稳定性的影响,利用Fluent求解器模拟了同轴射流燃烧器中火焰的燃烧,研究了CO_(2)和N_(2)作为稀释气体对火焰闪烁现象的影响,并分析了火焰闪烁的非线性特性。结果表明:轴向最大火焰温度随着稀释比的增大而降低,火焰的振荡幅度也随之减弱;相比N_(2),CO_(2)更容易抑制火焰的闪烁;增大稀释比也会使火焰的闪烁频率峰值提高,燃烧系统的流动和换热也从周期性振荡进入混沌状态。In order to study the influence of diluent gas on instability of flame flickering,the combustion of flame in coaxial jet burner was simulated by Fluent software.As diluent gas,the influence of CO_(2) and N_(2) on flame flickering was studied,so as to analyze the nonlinear characteristics of flame flickering.Results show that the maximum axial flame temperature decreases with the increase of dilution ratio,and the oscillation of the flame also weakens.Compared with N_(2),CO_(2) can suppress flame flickering more easily.With the increase of dilution ratio,the peak flicker frequency of the flame increases gradually,and the flow and heat transfer of the combustion system would also change from periodic oscillation to chaos.

关 键 词：稀释气体 同轴射流 火焰闪烁 非线性 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]