分层比对双旋流预混火焰结构和燃烧不稳定的影响  

Effect of Stratification Ratio on Structure and Combustion Instability of Double-Swirl Premixed Flame

作　　者：刘易明 谭建国[1] 高政旺 刘瑶 Liu Yiming;Tan Jianguo;Gao Zhengwang;Liu Yao(School of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,长沙410073

出　　处：《燃烧科学与技术》2023年第4期444-450,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(91441121).

摘　　要：基于双旋流预混燃烧实验系统,采用动态压力传感器、ICCD相机等装置,研究了不同分层比对双旋流预混火焰宏观结构和燃烧不稳定的影响.研究结果表明:随着分层比增大,火焰的主释热区由主燃级下游逐渐移向火焰根部,再逐渐向预燃级下游靠近,旋流火焰张角随之增大,火焰中心界面结构有“W”、“V”和“多褶”3种典型结构;随着分层比增大,火焰由稳定转为不稳定,且主频都在60 Hz左右,振幅先增大再慢慢下降,且在分层比为1.25和1.50时,有明显的不稳定第二频率出现,其大小约等于2倍的不稳定主频.Based on a two-swirl premixed combustion experiment system,the effects of different stratification ratio on the macrostructure and combustion instability of the two-swirl premixed flame were investigated by using a dynamic pressure sensor and an ICCD camera.The results show that with the increase of the stratification ratio,the main heat release zone of the flame gradually moves from the downstream of the main combustion area to the flame root and then to the downstream of the precombustion area,and the vortex flame angle increases accord-ingly.The central interface of the flame has three typical structures:“W”,“V”and“multi-fold”.With the increase of the stratification ratio,the flame changes from stable to unstable,the main frequency is around 60 Hz,and the amplitude increases first and then slowly decreases.Moreover,when the stratification ratio is 1.25 and 1.50,there is an obvious unstable second frequency,which is about twice the unstable main frequency.

关 键 词：双旋流 预混火焰 宏观结构 分层比 燃烧不稳定 

分 类 号：TK11[动力工程及工程热物理—热能工程]