Effects of Gas Flow Rate on the Discharge Characteristics of a DC Excited Plasma Jet

A direct current（DC） source excited plasma jet consisting of a hollow needle anode and a plate cathode has been developed to form a diffuse discharge plume in ambient air with flowing argon as the working gas.Using optical and electrical methods,the discharge characteristics are investigated for the...

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Published inPlasma science & technology Vol. 17; no. 9; pp. 738 - 742
Main Author 李雪辰 贾鹏英 狄聪 鲍文婷 张春燕
Format Journal Article
LanguageEnglish
Published 01.09.2015
Subjects
Argon
Direct current
Discharge
Excitation
Flow rate
Fluid dynamics
Plumes
Turbulent flow
放电特性
放电脉冲
气体流量
湍流模式
激发
直流
等离子体射流
脉冲放电
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ISSN1009-0630
DOI10.1088/1009-0630/17/9/04

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Summary:A direct current（DC） source excited plasma jet consisting of a hollow needle anode and a plate cathode has been developed to form a diffuse discharge plume in ambient air with flowing argon as the working gas.Using optical and electrical methods,the discharge characteristics are investigated for the diffuse plasma plume.Results indicate that the discharge has a pulse characteristic,under the excitation of a DC voltage.The discharge pulse corresponds to the propagation process of a plasma bullet travelling from the anode to the cathode.It is found that,with an increment of the gas flow rate,both the discharge plume length and the current peak value of the pulsed discharge decrease in the laminar flow mode,reach their minima at about1.5 L/min,and then slightly increase in the turbulent mode.However,the frequency of the pulsed discharge increases in the laminar mode with increasing the argon flow rate until the argon flow rate equals to about 1.5 L/min,and then slightly decreases in the turbulent mode.
Bibliography:LI Xuechen , JIA Pengying , DI Cong , BAO Wenting, ZHANG Chunyan （1.College of Physics Science N： Technology, Hebei University, Baoding 071002, China; 2.Key Lab of Photo-Electronics Information Materials of Hebei Province, Baoding 071002 China）
A direct current（DC） source excited plasma jet consisting of a hollow needle anode and a plate cathode has been developed to form a diffuse discharge plume in ambient air with flowing argon as the working gas.Using optical and electrical methods,the discharge characteristics are investigated for the diffuse plasma plume.Results indicate that the discharge has a pulse characteristic,under the excitation of a DC voltage.The discharge pulse corresponds to the propagation process of a plasma bullet travelling from the anode to the cathode.It is found that,with an increment of the gas flow rate,both the discharge plume length and the current peak value of the pulsed discharge decrease in the laminar flow mode,reach their minima at about1.5 L/min,and then slightly increase in the turbulent mode.However,the frequency of the pulsed discharge increases in the laminar mode with increasing the argon flow rate until the argon flow rate equals to about 1.5 L/min,and then slightly decreases in the turbulent mode.
34-1187/TL
DC excited plasma jet, plasma bullet, pulsed discharge, gas flow rate, laminar mode, turbulent mode
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ISSN:1009-0630
DOI:10.1088/1009-0630/17/9/04