大气压氩气环境下体积介质阻挡放电光谱特性

Spectral Characteristics Study of Atmospheric Pressure Argon Volume Dielectric Barrier Discharge

通过介质阻挡放电产生的等离子体可与燃料中的烃类分子发生碰撞裂解反应,将燃料分子裂解生成更容易起爆的氢气和小分子烃类,能有效改善液体燃料连续旋转爆震发动机的起爆性能。该研究在真空仓中开展体积介质阻挡放电的丝状放电光谱测试,分析了大气压氩气环境下体积介质阻挡放电的电子激发温度和电子密度随加载电压的变化规律。丝状放电的电子激发温度通过波尔兹曼斜率法计算,电子密度采用斯塔克展宽法计算。发现发射谱线均由氩原子4p—4s能级跃迁产生;各谱线强度随加载电压的提高均呈上升趋势,且与电压基本呈线性关系;对于大气压丝状放电,加载电压对电子激发温度和电子密度没有明显影响作用,加载电压12.5~14.5kV范围内,电子激发温度稳定在3 400K附近,电子密度在10^(25) m^(-3)量级。

Plasma produced through dielectric barrier discharge can react with hydrocarbon molecules in the fuel by collision cracking reaction,causing fuel molecules to be decomposed into hydrogen and small molecule hydrocarbons that are more prone to detonate,which will improve the ignition properties of the continuous rotating detonation engine with liquid fuel.In this paper,the spectral test of volume dielectric barrier discharge（DBD）was carried out in vacuum chamber in order to analyze how the electron excitation temperature and electron density of volume DBD change with the applied voltage under atmospheric pressure argon.In addition,the electron excitation temperature of filamentous discharge was calculated by the Boltzmann slope method,and the electron density was calculated by Stark broadening method.It was found that all of the emission lines arose from electronically excited argon atoms 4 p-4 s transitions.The intensities of the lines increased with the increase of the applied voltage and had a linear relationship with the voltage basically.For the atmospheric filamentous discharge,the load voltage has no obvious effect on the electron excitation temperature and the electron density.When the applied voltage is in the range of 12.5-14.5 kV,the electron excitation temperature is stabilized around 3 400 K,and the electron density is on the order of 1025 m-3.