活化热氛围中CO_2体积分数对喷射起升火焰自燃及碳烟排放特性的影响  

Effect of CO_2 on Autoignition and Soot Emission Characteristics of Lifted Flames in a Controllable Active Thermo-Atmosphere

作　　者：邓俊[1] 吴志军[1] 黄成杰[2] 李理光[1] 

机构地区：[1]同济大学汽车学院,上海 200092 [2]上海交通大学机械与动力工程学院,上海 200030

出　　处：《燃烧科学与技术》2008年第1期23-27,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(2001CB209201);国家自然科学基金资助项目(5054601450676055)

摘　　要：研究了可控活化热氛围协流中CO2体积分数对中央喷射液体燃料起升火焰的自燃及碳烟排放特性的影响.结果表明,协流中加入少量的CO2时,协流温度基本保持不变,但起升火焰的自燃受到抑制;随着CO2含量的增加,滞燃期延长而喷射火焰起升高度增加;存在一个温度值拐点,在拐点两侧,滞燃期对协流温度的敏感性截然不同;随着协流中CO2含量的增加,拐点温度值升高.碳烟排放结果表明,随着协流温度下降和协流中CO2体积分数的增加,碳烟排放呈下降趋势.碳烟排放的增加与喷射火焰的起升高度有密切的关系,随着起升高度降低,碳烟排放的增长趋势加强.This paper presents a study of lifted flames in a controllable active thermo-atmosphere. The effect of CO2 concentration in the co-flow on the auto-ignition characteristics and soot emission of central jets flames were investigated. The results show that co-flow temperature remains unchangeable in the case of small CO2 concentration addition, but the auto-ignition of central jets is suppressed. With the increasing of the CO2 concentration, the auto-ignition of the central jets in the co-flow delays and the lifteff height of the lifted flame increases. There exists a temperature inflexion where the sensitivity of co-flow temperature to auto-ignition delay varies when the co-flow temperature is higher or lower than the temperature inflexion. The soot emission decreases with the CO2 concentration increasing or the co-flow temperature decreasing. The results show that soot emission has a close relationship with the lifteff height. Soot emission increases sharply with the lowering of lifteff height.

关 键 词：活化热氛围 CO2 自燃 碳烟排放 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]