同轴自由射流火焰的实验研究  

Experimental Study of Co-Axial Free Jet Flame

作　　者：郭庆华[1] 梁钦锋[1] 颜卓勇[1] 于广锁[1] 于遵宏[1] 

机构地区：[1]华东理工大学洁净煤技术研究所,上海200237

出　　处：《燃烧科学与技术》2008年第5期441-445,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(2004CB217703);上海市曙光计划资助项目(06SG34)

摘　　要：利用同轴双通道烧嘴,研究敞开环境下氧气-酒精垂直自由射流扩散火焰的特征.计算同轴射流双通道烧嘴的当量直径、Froude数等影响湍流扩散火焰长度的参数,拟合湍流扩散火焰长度的公式.拍摄了曝光时间为1/1 000 s的火焰图像,测量液体燃料在不同操作条件下的破裂长度.实验结果表明,湍流火焰的长度在富氧条件下随着酒精流量的增加而增长,当达到完全燃烧条件时火焰长度达到最大值;湍流扩散火焰的液体破裂长度几乎不随操作条件发生变化.Properties of vertical free jet turbulent diffusion flame are studied in a co-axial double channel burner. The parameters that affect turbulent diffusion flame, such as equivalent diameter and Froude number, are calculated. The turbulent diffusion flame length is also fitted. The break length of liquid fuel is measured from the pictures with the exposure time of 1/1 000 s. The experimental results show that at a fixed high oxygen flow rate turbulent flame length increases with the rising of alcohol mass flow rate. At combustion equivalence ratio, the flame length reaches its highest value. The break length of alcohol in turbulent jet flame is hardly affected by operation conditions.

关 键 词：同轴射流 湍流扩散火焰 火焰长度 破裂长度 

分 类 号：O643.2[理学—物理化学]