C_(4)F_(7)N气体电弧的辐射输运特性研究  

Study on Radiation Transport Characteristics of C_(4)F_(7)N Gaseous Arc

作　　者：仲林林 王逸凡 顾琦 Zhong Linlin;Wang Yifan;Gu Qi(School of Electrical Engineering Southeast University,Nanjing 210096 China)

机构地区：[1]东南大学电气工程学院,南京210096

出　　处：《电工技术学报》2023年第19期5316-5329,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(92066106,51907023);江苏省科协青年科技人才托举工程(2021031);东南大学“至善青年学者”支持计划(中央高校基本科研业务费)(2242022R40022)资助项目。

摘　　要：辐射作为电弧能量输运的主要方式,在灭弧过程中起着关键作用。该文以环保型气体C_(4)F_(7)N及其与CO_(2)和N_(2)的混合气体为对象,建立了耦合净辐射模型的气体电弧二维磁流体动力学模型,分析了触头运动过程中C_(4)F_(7)N电弧的辐射输运特性,探究了电流大小和混合气体配比对电弧形态、温度及辐射能量的影响。进一步地,搭建电弧光学诊断实验平台,分别利用高速相机和光谱仪捕获电弧形态并采集电弧光谱信息,验证了仿真模型的有效性。研究发现,受电弧辐射能量沿轴线分布影响,C_(4)F_(7)N气体电弧形态呈葫芦状。随着电流增大,电弧辐射能量增强,葫芦状形态逐渐明显。随着C_(4)F_(7)N气体含量增加,电弧在径向洛伦兹力的作用下逐渐收缩。In order to reduce greenhouse gas emissions in power industry,more and more efforts are being made to discovery eco-friendly SF6 replacements.At the moment,SF6 alternatives are commonly used as insulating medium,but study on their arc extinguishing performance is insufficient and is still in the exploratory stage.An excellent interrupting medium should quickly cool the arc,and radiation as the main form of arc energy transport plays a key role in the arc interrupting process.Therefore,this paper performs a study on the radiation transport characteristics of C_(4)F_(7)N gaseous arc mixing with CO_(2) and N_(2) by combining numerical simulation and experiment,which can lay a theoretical foundation for the engineering application of eco-friendly arc extinguishing gases.Firstly,a two-dimensional(2D)magnetohydrodynamics(MHD)model is established to describe the transport behavior of C_(4)F_(7)N gaseous arcs by coupling multi-physical field equations,including Navier-Stokes equations,Maxwell equations,and turbulence equations.In this MHD model,the radiation transport is described by the net emission model which is easy to implement and requires net emission coefficients(NEC)as input.Based on the MHD model,the time-dependent multi-physical fields,such as temperature and radiation energy of C_(4)F_(7)N gaseous arcs are obtained by the finite volume method(FVM).The radiation transport characteristics of C_(4)F_(7)N gaseous arcs are investigated during the opening of contacts,and the effects of current magnitude and mixing ratios on the arc shape,temperature distribution,and radiation energy distribution are discussed.It is found that due to the distribution of arc radiation energy along the x axis,the C_(4)F_(7)N arcs are gourd-shaped.As the current is raised,the arc radiation energy increases,leading to a clearer gourd shape.With the increase of gas content in C_(4)F_(7)N,the arcs gradually shrink by the action of radial Lorentz force.Secondly,the experiment platform is constructed for the arc optical diagnosis.The arc sh

关 键 词：环保型气体 电弧 辐射输运 磁流体动力学 净辐射模型 

分 类 号：TM501.2[电气工程—电器]