摘要
低温等离子体助燃技术在提高燃烧效率和拓展燃烧极限方面表现出良好的应用前景.为此,利用大气压介质阻挡放电对CH4/O2/He混合气体进行处理,对低温等离子体增强燃料燃烧的特性开展了研究.建立了介质阻挡放电助燃装置,对预混燃烧火焰图像进行采集并从中提取火焰燃烧锋面,采用本生灯法对等离子体作用下预混火焰传播速度进行测量,并与等离子体关闭时火焰传播速度进行比较分析,以此评价等离子体增强燃烧的效果.结果表明：在不同当量比（φ）工况下,无论有无等离子体作用,随着φ增加,火焰传播速度均先增加后减小,φ=1时达到最大值;对CH4/O2/He混合气体进行等离子体放电处理后,其火焰传播速度在不同当量比作用下都有所增强,在当量比为0.85～1.15的范围内,燃烧速度增加17％～35％,因此可以认为等离子体对预混甲烷燃烧有显著强化作用.
Low-temperature plasma has been reported as quite promising in improving combustion efficiency and re-ducing lean blow-off limit. We adopted dielectric barrier discharge （DBD） to treat premixed CHn/O2/He and investigatedthe combustion characteristics of using low-temperature plasma to improve combustion efficiency. We built up a DBDplasma-assisted burner and captured the flame images of premixed CH4/O2/He gas using a camera. Flame fronts were ex-tracted from the images. The flame speed was measured using the Bunsen burner method. This speed was compared withthat of the flame with no plasma assistance to characterize the plasma assistance＇s enhancing effect on combustion. Theresults show that when the equivalence ratio varies, in the presence or absence of plasma, the propagation speed of theflame increases firstly and then decreases with increasing , and the maximum speed appears at φ-1. With plasma assis-tance, the flame speed of the premixed gas is increased by 17%-35% when φ varies from 0.85 to 1.15, proving thatplasma can enhance the combustion of premixed CHa/O2/He significantly.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第10期2980-2985,共6页
High Voltage Engineering
基金
中央高校基本科研业务费专项资金(xjj2013086)
陕西省自然科学基础研究计划项目(2014JQ7254)
国家自然科学基金(51477135)~~
关键词
介质阻挡放电
等离子体助燃
燃料活化
燃烧锋面
本生灯法
火焰传播速度
dielectric barrier discharge
plasma-assisted combustion
fuel activation
flame front
Bunsen burner method
flame speed
