摘要
发射光谱是诊断真空电弧关键物理参数的有效方法。然而,电弧等离子体对光的吸收效应会影响光谱的辐射强度,甚至引起光谱线型畸变。这些效应必然会干扰发射光谱的准确识别,进而影响基于发射光谱的参数诊断。为了解决这些问题,建立了真空电弧等离子体碰撞辐射模型,考虑了电子碰撞激发-退激发、电子碰撞电离-三粒子复合、辐射衰减以及辐射吸收过程,结合辐射输运方程合成了发射光谱,最后通过对实验光谱的拟合计算出真空电弧的关键物理参数。结果表明,考虑吸收效应之后,光谱发射系数和谱线展宽均会增加,其中510.6 nm的发射系数增量最大;另外,电子温度和电子数密度均有所增加,其中电子温度的平均增量为0.05 eV,而电子数密度的平均增量为7.06×1020 m^(-3);最后,吸收效应会通过改变净辐射速率直接影响辐射对应能级的粒子密度,同时也能通过改变能量分布状态间接改变电弧的能级布居。
Optical emission spectroscopy is an effective method for measuring key physical parameters in a vacuum arc.However,radiation absorption inside the arc plasma can significantly impact the spectral intensity and even distort the line shape.These effects hinder accurate spectral identification and consequently compromise parameter diagnostics based on optical emission spectroscopy.To address this issue,a collisional radiative model for vacuum arc was developed in this study.The model incorporated electron impact excitation/de-excitation,electron impact ionization/three-body recombination,spontaneous emission,and radiation absorption processes.The synthetic spectra were generated by coupling the model with the radiative transfer equation,and key plasma parameters were extracted by fitting the model to the experimental spectral data.The results indicate that,after taking into account the absorption effect,both spectral emission coefficient and spectral line broadening will increase,and the largest increment in the emission coefficient is found at 510.6 nm;furthermore,both electron temperature and electron density will increase,and the average increments in electron temperature and electron density are 0.05 eV and 7.06×1020 m^(−3),respectively;finally,the absorption effect can directly affect the particle density at the energy levels corresponding to the radiation by changing the net radiation rate,and can also indirectly change the population distribution of the arc by changing the energy distribution state.
作者
曹博
王振兴
潘世佳
苏鑫鹏
李瑞
耿英三
CAO Bo;WANG Zhenxing;PAN Shijia;SU Xinpeng;LI Rui;GENG Yingsan(National Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,China)
出处
《高电压技术》
北大核心
2026年第2期984-995,共12页
High Voltage Engineering
基金
智能电网重大专项(2030)(2024ZD0802500)。
关键词
发射光谱
吸收效应
碰撞辐射模型
真空电弧
真空断路器
optical emission spectroscopy
absorption effect
collisional radiative model
vacuum arc
vacuum interrupter
