摘要
为了分析大气压空气环境中氩气等离子体射流的特性,建立了二维轴对称的等离子体射流喷射模型;考虑待处理材料对等离子体射流的影响,利用Jets&Poudres软件耦合求解了等离子体射流的可压缩N-S方程、能量方程以及K-ε湍流方程;采用自由边界条件来处理射流等离子体的外边界条件,分析了射流等离子体的温度、速度以及所含空气组分等特性,并研究了工作气体体积流量以及喷口直径对喷射特性的影响。结果表明,射流等离子体的温度和轴向速度分布呈倒锥形分布,温度与轴向速度沿径向呈高斯分布衰减;等离子体径向速度的最大值出现在射流的尾部,且径向速度的峰值约为轴向速度峰值的1%;随着氩气体积流量的增加,等离子体的轴向体积流量显著增加,而等离子体温度逐渐降低,说明体积流量的增加提高了等离子体的冷却效应;随着喷口直径的增加,等离子体温度逐渐升高,而轴向速度的峰值显著减小,其最小值则几乎不变;在靠近喷嘴的等离子体射流高温高速区域,空气难以进入,该区域内的空气体积分数为3%～5%。
In order to analyze the characteristics of Argon plasma jet under atmospheric air environment, a two-dimensional axis-symmetrical spurt model of plasma jet was established, in which the influences of a material work piece on plasma jet was considered, the Jets＆Poudres software was employed to solve the compressible N-S equations, energy equation and K-e turbulence equation, and the free boundary was used to deal with the outside boundary condition of plasma jet. Moreover, the plasma temperature, velocity and air percentage composition in plasma were analyzed, and the effects of Argon flow rates and nozzle diameters on spurt properties were also researched. The results show that, the distributions of plasma temperature and axial velocity present as inverted cone shape, and the distributions of attenuations of temperature and axial velocity are behaved as Gaussian function; The maximum value of radial velocity is 1% that of axis velocity, which appears at the tail of plasma jet; As Argon flow rates increase, the axial velocities of plasma jet increase apparently, and the plasma temperatures decrease gradually, indicating that the cool effect of plasma jet is enlarged at high gas flow rate; As nozzle diameters increase, the plasma temperatures increase gradually, and the peak values of axial velocities decrease sharply although the minimum values of axial velocities keep constant. Furthermore, in the region of high plasma temperature and velocity, it is difficult for air to enter, and the air percentages in this region are almost around 3%～5%.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第7期1775-1780,共6页
High Voltage Engineering
基金
国家优秀博士论文基金(200338)
2007年西安市科技创新支撑计划(YF07167)~~
作者简介
1983-，男。博士生2009年于沈阳工业大学电气工程学院获得工学硕士学位。主要从事介质阻挡放电及其应用的研究 E-mail：shaoxianjun0575@163．com
1970-，男，博士，教授，博导2001年毕业于西安交通大学电气工程学院获博士学位。主要从事放电等离子体、固体绝缘、电力设备状态检测等领域，主持自然科学基金等国家项目多项 E-mail：鲥zhang@mail．xjtu．edu．cn
1986-，女，硕士生2008年毕业于重庆大学获学士学位。主要从事放电等离子体及其应用方面的研究 E-mail：lyxlyx34@163．com
1988-，男，硕士生2009年毕业于西安交通大学获学士学位。主要从事放电等离子体及其应用方面的研究 E-mail：zhangzenghui@stu．xjtu．edu．cn
1988-，男，硕士生2010年毕业于西安交通大学获学士学位。主要从事放电等离子体、固体沿面绝缘方面的研究 E-mail：zhanjiangyang@gmail．com
