合成气层流预混火焰加速效应实验研究  

Experimental Study on Accelerative Characteristics of Syngas Laminar Premixed Flames

作　　者：赵浩然 李刚[1] 王金华 黄佐华[2] ZHAO Hao-ran;LI Gang;WANG Jin-hua;HUANG Zuo-hua(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《东北大学学报（自然科学版）》2024年第9期1334-1341,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(52406126);中央高校基本科研业务费专项资金资助项目(N2301024);辽宁省自然科学基金资助项目(2024-BSBA-25);建龙集团-东北大学青年科技创新基金资助项目(2023012600001)

摘　　要：利用定容燃烧弹可视化实验平台对合成气层流预混火焰加速效应开展了系统研究.通过调整混合气的当量比和氧氮体积比实现自身不稳定性的解耦控制,在此基础上研究了火焰加速阶段、临界点和火焰加速因子.层流预混火焰的加速传播过程呈现出明显的准稳态、过渡态加速、饱和态加速3个阶段.4种临界点的先后顺序为:裂纹分裂临界点≈过渡态加速临界点<均匀细胞化临界点≈饱和态加速临界点.饱和态加速阶段的加速因子数值在1.1~1.2之间,并未与Lewis数和密度比呈现出明显的依赖关系.结果表明,火焰自身不稳定性对层流火焰的加速临界点有显著促进作用,但并不会影响饱和态阶段的火焰加速强度.A systematic investigation on accelerative characteristics of syngas laminar premixed flames is conducted using the visual experimental platform of constant volume combustion chamber.The decoupling control of self‑instability is realized by adjusting the equivalence ratio and oxygen‑nitrogen ratio of gas mixture,allowing for an analysis of flame acceleration stages,onsets,and acceleration exponents.Three distinct stages of laminar flame propagation outwardly are identified,namely quasi‑steady,transitional acceleration,and saturated acceleration.The order of four onsets is as follows:crack branching≈transitional acceleration<uniform cellularity≈saturated acceleration.The acceleration exponents in saturated acceleration stage are in the range of 1.1~1.2,showing independent on Lewis number and density ratio.The results indicate that the flame intrinsic instability can have a significant promotion on the onset of laminar flame acceleration,while it does not affect the flame acceleration strength in saturated acceleration stage.

关 键 词：火焰加速传播 临界点 加速因子 层流预混火焰 合成气 

分 类 号：TK91[动力工程及工程热物理]