颗粒群辐射传热对电弧伏安特性影响的研究  

Study on the influence of radiation of particle groups on arc volt-ampere characteristics

作　　者：秦鹏 廖梦然 夏维东[1] 王城[1] QIN Peng;LIAO Mengran;XIA Weidong;WANG Cheng(Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China;Thermal Power Technology Key Laboratory, Wuhan Second Ship Design Research Institute, Wuhan 430025, China)

机构地区：[1]中国科学技术大学热科学与能源工程系,安徽合肥230026 [2]武汉第二船舶设计研究所热能动力技术重点实验室,湖北武汉430025

出　　处：《中国科学技术大学学报》2020年第4期442-449,共8页JUSTC

基　　金：国家自然科学基金(11675177)资助.

摘　　要：在对颗粒群与电弧相互作用的探究中,颗粒群辐射传热对电弧伏安特性的影响是一个重要方面.以Elenbass-Heller能量方程为基础,建立了圆柱对称电弧等离子体流动传热与颗粒群辐射过程相结合的一维耦合模型,利用P-1辐射模型求解了颗粒群辐射传热方程,探究了石墨颗粒群的辐射对电弧伏安特性产生的影响.结果表明:石墨颗粒群辐射增加了电弧的传热,电弧被“冷却压缩”,电弧的电场强度升高;同时电弧通道半径越大,颗粒群辐射对电场强度的影响越显著;颗粒群对氩气电弧等离子体的影响远远高于其对氢气电弧等离子的影响.通过对颗粒辐射的计算分析认为,颗粒群辐射传热主要作用发生在电弧导电通道外侧,在冷壁边缘颗粒群辐射为净吸收,因此减小了电弧向壁面传热.When particle groups are injected directly into a plasma torch,the influence of the particle groups on the arc plasma is an important factor in the design of the plasma torch.This paper introduces the P-1 radiation model,which is used to describe the radiation between particle groups.Combined with the P-1 radiation model,the Elenbass-Heller equation is modified and then solved to probe into the radiation influence of the graphite particle groups on the volt-ampere characteristics of the arc plasma.The results show that the radiation of the graphite particle groups increases the heat conductivity of the arc,the arc is compressed by cooling down,and the intensity of the electric field of the arc increases.At the same time,the effect of particle group radiation on the intensity of the electric field is more evident along with the larger arc channel radius.Moreover,the effect on the argon arc plasma is much larger than its effect on the hydrogen arc plasma.It is recognized by the calculation of the particle radiation that the particle group radiation mainly plays an important role in the location near the wall.At the edge of the cold wall,the particle group radiation functions as net absorption,and the heat transferred to the cold wall is reduced.

关 键 词：电弧等离子体 颗粒群 P-1模型 伏安特性 

分 类 号：TM501.2[电气工程—电器]