点电极下负电场对火焰的影响  

Effect of Point Electrodes with Applied Negative Voltage on Flame

作　　者：康婵[1] 杨星[1] 刘杰[1] 房建峰[1] 吴筱敏[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《工程热物理学报》2015年第3期673-677,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50876087;No.51176150)

摘　　要：本文研究了常温常压不同过量空气系数下定容燃烧弹中对点电极加载不同电压时甲烷一空气预混燃烧火焰的传播与燃烧特性。结果表明:点电极加载电压后使得火焰传播速度变快,压力峰值变大,峰值到达时间缩短。混合气φa=0.8、1.0、1.2在加载电压为-5 kV时,火焰横向传播速度分别比未加电压时增加12.6%、2.3%、9.7%,压力峰值到达时间分别比未加电压时缩短5.9、0.3、5.1 ms;加载电压为-10 kV时,火焰横向传播速度分别比未加电压时增加22.2%、9.6%、24.4%,压力峰值到达时间分别比未加电压时缩短9.9、3.7、11.8 ms。The experiment was conducted to investigate the influences of the point electrodes with various applied voltages on the flame propagation and combustion characteristics of premixed CH_4/Air mixtures.The results show that the flame speed and the pressure peak significantly increased when the voltage was applied to the point electrodes.Compared with those without the applied voltage,the horizontal flame speed increases by 12.6%,2.3%and 9.7%and the pressure peak time shortens by5.9,0.3 and 5.1 ms when the applied voltage is-5 kV,the horizontal flame speed increases by 22.2%,9.6%and 24.4%and the pressure peak time shorten by 9.9,3.7 and 11.8 ms when the applied voltage is-10 kV.

关 键 词：点电极 加载电压 火焰形状 火焰传播速度 燃烧压力 

分 类 号：TK16[动力工程及工程热物理—热能工程]