高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2011年
6期
1432-1438
,共7页
张冠军%詹江杨%邵先军%彭兆裕
張冠軍%詹江楊%邵先軍%彭兆裕
장관군%첨강양%소선군%팽조유
大气压等离子体射流(APPJs)%Ar等离子体%射流长度%气流速率%电极结构%电场强度
大氣壓等離子體射流(APPJs)%Ar等離子體%射流長度%氣流速率%電極結構%電場彊度
대기압등리자체사류(APPJs)%Ar등리자체%사류장도%기류속솔%전겁결구%전장강도
atmospheric pressure plasma jets（APPJs）%Ar plasma%jet length%flow rate%electrode configuration%electric field strength
为了研究不同大气压氩气射流结构的放电特性以及气流速率、外施电压和电极结构对射流体长度的影响,设计了外表面双电极、外表面单电极和中心同轴电极3种不同结构的氩气等离子体射流装置,并结合气体动力学和静电场进行了分析。实验结果表明,随着气流速率的增加,射流管内的氩气流动状态会经历从最初的层流态到中间的过渡态再到最后的湍流态的过程,相应的射流体长度也随着气流速率的增加先增大后减小,并在雷诺数为2000～3000时达到最大值。总体上来说,在同一气流速率下,单电极结构的射流体长度略大于双电极结构,而中心电极结构的射流长度较短;中心电极结构的放电最为稳定,双电极次之,单电极最差。分析认为,射流体长度主要取决于流注崩头的高能电子,由于双电极和单电极结构的电场以轴向分量为主,放电类似于流注放电,射流体较长;而中心电极结构的电场集中在中心电极尖端,放电起始于电晕放电,射流体较短。同样受电场分布的影响,随着射流管内径的增大,双电极和单电极结构的射流体长度最大值先增大后逐渐趋于饱和,而中心电极结构的射流体长度最大值则略有减小。
為瞭研究不同大氣壓氬氣射流結構的放電特性以及氣流速率、外施電壓和電極結構對射流體長度的影響,設計瞭外錶麵雙電極、外錶麵單電極和中心同軸電極3種不同結構的氬氣等離子體射流裝置,併結閤氣體動力學和靜電場進行瞭分析。實驗結果錶明,隨著氣流速率的增加,射流管內的氬氣流動狀態會經歷從最初的層流態到中間的過渡態再到最後的湍流態的過程,相應的射流體長度也隨著氣流速率的增加先增大後減小,併在雷諾數為2000～3000時達到最大值。總體上來說,在同一氣流速率下,單電極結構的射流體長度略大于雙電極結構,而中心電極結構的射流長度較短;中心電極結構的放電最為穩定,雙電極次之,單電極最差。分析認為,射流體長度主要取決于流註崩頭的高能電子,由于雙電極和單電極結構的電場以軸嚮分量為主,放電類似于流註放電,射流體較長;而中心電極結構的電場集中在中心電極尖耑,放電起始于電暈放電,射流體較短。同樣受電場分佈的影響,隨著射流管內徑的增大,雙電極和單電極結構的射流體長度最大值先增大後逐漸趨于飽和,而中心電極結構的射流體長度最大值則略有減小。
위료연구불동대기압아기사류결구적방전특성이급기류속솔、외시전압화전겁결구대사류체장도적영향,설계료외표면쌍전겁、외표면단전겁화중심동축전겁3충불동결구적아기등리자체사류장치,병결합기체동역학화정전장진행료분석。실험결과표명,수착기류속솔적증가,사류관내적아기류동상태회경력종최초적층류태도중간적과도태재도최후적단류태적과정,상응적사류체장도야수착기류속솔적증가선증대후감소,병재뢰낙수위2000～3000시체도최대치。총체상래설,재동일기류속솔하,단전겁결구적사류체장도략대우쌍전겁결구,이중심전겁결구적사류장도교단;중심전겁결구적방전최위은정,쌍전겁차지,단전겁최차。분석인위,사류체장도주요취결우류주붕두적고능전자,유우쌍전겁화단전겁결구적전장이축향분량위주,방전유사우류주방전,사류체교장;이중심전겁결구적전장집중재중심전겁첨단,방전기시우전훈방전,사류체교단。동양수전장분포적영향,수착사류관내경적증대,쌍전겁화단전겁결구적사류체장도최대치선증대후축점추우포화,이중심전겁결구적사류체장도최대치칙략유감소。
Atmospheric pressure Ar plasma jets（APPJs） were designed to research their discharge characteristics with three kinds of different jet configurations,i.e.,double wrapped electrode,single wrapped electrode and center-electrode inside tube.The influences of flow rates,applied voltage amplitudes,and electrode configurations on the length of APPJs were studied.The results show that,as the flow rates increase,the flow status of Ar in tube has a process from the laminar state to the transition state and finally to the turbulent state.Correspondingly,the jet length first increases,then decreases,and finally reaches the maximum length when the Reynolds number is around 2000~3000.Under the same gas flow rate,the length of the single-wrapped electrode jet is slightly longer than double wrapped electrode jet while the center-electrode jet is shortest among three electrode configurations.But the discharge stability of center-electrode jet is superior to that of double-wrapped electrode jet,and the single-wrapped electrode jet is the worst.It is generally believed that the length of the jets is based on the high-energy electron in the ionization head.The electric field of double-wrapped electrode jet and single-wrapped electrode jet is mainly axial component of electric field,which leads to the discharge similar to streamer discharge and prolongs the APPJ length,while the electric field of the center-electrode jet is concentrated at the peak of the center electrode,and the discharge is originated from corona discharge with short jet length.The jet length comparison of different tube sizes shows that under our paper＇s conditions,the maximum jet length of the double-electrode jet and single-electrode jet first increases with the increment of tube sizes and finally tends to saturation,while the maximum jet length of the centre-electrode jet slightly decreases.
