CH_(4)层流射流火焰燃烧特性及带电粒子浓度研究  

Study of CH_(4)laminar jet flame combustion characteristics and charged particle concentration

作　　者：李亚清 李灏辰 张玉涛 车博 Li Yaqing;Li Haochen;Zhang Yutao;Che Bo(College of Safety Science and Engineering,Xi′an University of Science and Technology,Shaanxi Xi′an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《消防科学与技术》2024年第8期1077-1085,共9页Fire Science and Technology

基　　金：国家自然科学基金(52174196)。

摘　　要：为了研究天然气管道泄漏火灾形成射流火焰的燃烧特性,自主搭建了CH_(4)层流燃烧系统,通过对比不同尺寸喷嘴在0.48~0.72 L/min射流流量条件下火焰的响应特征,分析射流出口上方的火焰形态、温度及带电粒子浓度运移规律。结果表明:火焰喷嘴尺寸相同时,射流火焰的几何尺寸和测点平均温度均随射流流量的增加而增大,但不同喷嘴尺寸处的射流出口温度均随喷嘴流量的增加而降低。越靠近喷嘴区域,火焰根部离子电流值越大,但最大值不超过1.0μA,并且火焰轴向离子电流变化率随流量的增加而降低,火焰边缘处的离子电流值随测点与喷嘴之间的间距增大而减小。In order to study the combustion characteristics of jet flames formed by natural gas pipeline leakage fires,a CH_(4)laminar combustion system was independently constructed and the morphology,temperature and charged particle concentration transport law of the flame above the jet outlet were analysed by comparing the response characteristics of the flames with different nozzle sizes under the conditions of 0.48~0.72 L/min jet flow.The results show that for the same nozzle size,the geometry of the jet flame and the average temperature of the measurement point increase with the increase of the jet flow rate,but the jet exit temperature for different nozzle sizes decreases with the increase of the nozzle flow rate.In addition,the value of the ionic current at the flame root increases the closer to the nozzle region,but the maximum value does not exceed 1.0μA,and the rate of change of the flame axial ionic current decreases with the increase of the flow rate,and the value of the ionic current at the flame edge decreases with the increase of the distance between the measurement point and the nozzle.

关 键 词：射流火焰 燃烧特性 火焰形态 火焰温度 离子电流 

分 类 号：X932[环境科学与工程—安全科学] TU998.12[建筑科学—市政工程]