氮氩直流电弧等离子体射流特性实验研究  

Experimental Study on the Characteristics of Nitrogen-Argon DC Arc Plasma Jet

作　　者：赵明波 曹修全 郭文钰 徐浩铭 马耀明 林长海 ZHAO Mingbo;CAO Xiuquan;GUO Wenyu;XU Haoming;MA Yaoming;LIN Changhai(School of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,China;Industrial Research Institute of Sichuan University of Science&Engineering in Yibin,Yibin 644000,China;Sichuan Suge Communication Technology Co.,Ltd.,Yibin 644000,China)

机构地区：[1]四川轻化工大学机械工程学院,宜宾644000 [2]宜宾四川轻化工大学产业研究院,宜宾644000 [3]四川苏格通讯技术有限公司,宜宾644000

出　　处：《高电压技术》2023年第5期2206-2215,共10页High Voltage Engineering

基　　金：宜宾市科技计划项目(2021JC002);道路施工技术与装备教育部重点实验室开放基金项目(300102252502);四川轻化工大学研究生创新基金(y2021035)。

摘　　要：基于自主研发的等离子体射流性能监测系统,文中通过实验研究了氮氩直流电弧等离子体射流特性:利用基于LabVIEW虚拟仪器技术的监测系统研究了不同氮氩混合比例下直流电弧等离子体射流的弧压、热效率及热焓值特性;利用CCD图像采集与MATLAB图像处理融合技术研究了不同氮氩混合比例下直流电弧等离子体射流长度特性;提出通过钨棒熔断时间表征等离子体射流相对温度的方法,并研究了不同氮氩混合比例下直流电弧等离子体射流在离喷出口5mm处的相对温度变化规律。实验结果表明:氮氩混合比例会对直流电弧等离子体射流特性产生明显影响,具体为直流电弧等离子体的弧压、热效率、热焓值、射流长度、喷口射流温度均随着氮气所占氮氩混合比例的增加呈现出先急剧增加后以某一恒定速率缓慢增加的现象。On the basis of a home-made system for monitoring the performance of plasa jet,we experimentally studied the jet characteristics of a home-made thermal plasma torch working with the mixture of Nitrogen and Argon.The arc voltage characteristics,thermal efficiency characteristics,and mean specific enthalpy characteristics of the proposed thermal plasma torch working with different mixture ratio of Nitrogen and Argon were experiential studied by using the monitoring system based on LabVIEW virtual instrument technology.The jet length characteristics of the proposed thermal plasma torch working with different mixture ratio of Nitrogen and Argon were experimental studied by using a CCD image acquisition and MATLAB image processing.A new method for monitoring the jet temperature of the plasma torch was proposed by using the fusing time of tungsten rod,and the relative jet temperature of the plasma torch at 5 mm away from the jet outlet was studied.The experimental results show that the jet characteristics of DC plasma torch will be influenced obviously by the ratio of nitrogen in the working gas.Specifically,with increasing the mixture ratio of Nitrogen from 0 to 100%,the arc voltage,thermal efficiency,specific enthalpy,jet length and relative jet temperature of the plasma torch will increase sharply at first,then linearly increase with a slower rate.

关 键 词：氮氩直流电弧等离子体 等离子体射流特性 等离子体监测系统 LabVIEW虚拟仪器技术 MATLAB图像处理技术 

分 类 号：O53[理学—等离子体物理]