微细通道内火焰传播及淬熄过程研究  

Study on Flame Propagation and Quenching Process in Microchannels

作　　者：郑金磊 Zheng Jinlei(State Key Laboratory of Chemical Safety,Shandong,Qingdao,266104;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Shandong,Qingdao,266104)

机构地区：[1]化学品安全全国重点实验室,山东青岛266104 [2]中石化安全工程研究院有限公司,山东青岛266104

出　　处：《安全、健康和环境》2024年第8期41-47,共7页Safety Health & Environment

摘　　要：为研究阻火器阻火单元微细通道内火焰传播与淬熄的过程,基于Fluent建立了平板狭缝通道内火焰传播的数值模型。将仿真结果与之前的实验值进行了对比,发现仿真结果与实验值的误差最大值仅为6.5%,数值计算模型准确性及仿真结果可靠度均较高。提取火焰在微细通道内的温度变化数据可知,微细通道内火焰逐渐拉伸,最终形成“尖状”,同时传播速度呈先增大后减小的趋势。分析OH自由基的浓度分布情况可知,OH自由基的浓度分布也呈先增大后减小的趋势。其次分析火焰的淬熄过程可知,入口火焰速度、孔隙高度均是影响淬熄长度的重要因素,但温度变化对淬熄长度的影响程度较低。In order to study the flame propagation and quenching process in the micro channel of the flame arrester element,a numerical model of flame propagation in a flat slit channel was established based on Fluent.Comparing the simulation results with the experimental values,it was found that the maximum error between the simulation results and the experimental values was only 6.5%,and the accuracy of the numerical calculation model and the reliability of the simulation results were both high.Extracting the temperature change data of the flame in the micro channel showed that the flame gradually stretches and eventually forms a“pointed”shape in the micro channel,while the propagation speed first increased and then decreased.By analyzing the concentration distribution of OH radicals,it can be seen that the concentration distribution of OH radicals also tended to increase first and then decrease.Secondly,by analyzing the quenching process of the flame,it can be seen that the inlet flame speed and pore height were important factors that affect the quenching length,but the impact of temperature changes on the quenching length was relatively low.

关 键 词：火焰传播 冷壁效应 自由基 微细通道 淬熄长度 

分 类 号：TK16[动力工程及工程热物理—热能工程]