层流氩等离子体射流温度的测量  

Temperature measurements of laminar argon plasma jet

作　　者：孟显[1] 李腾[1] 潘文霞[1] 陈熙[2] 吴承康[1] 

机构地区：[1]中国科学院力学研究所,北京100190 [2]清华大学工程力学系,北京100084

出　　处：《强激光与粒子束》2011年第3期783-786,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(50836007;10805066;10772016)

摘　　要：采用给水冷管状静电探针施加负偏置电压、并使探针以一定速度垂直于射流轴线扫过层流氩等离子体射流的方法,测量探针所收集到的累积离子饱和电流随侧向位置的变化,利用Abel变换推导出了局部离子饱和电流密度沿射流径向的分布;采用自制的水冷动压探针,以动态扫描法测量了射流动压沿射流径向的分布;根据局部离子饱和电流密度和射流动压的测量数据,由理论关系式推导出了等离子体射流横截面上的温度分布,同时,采用谱线相对强度法测量了等离子体射流的激发温度。结果表明:两种方法得到的等离子体射流中心温度吻合较好,所得到的射流中心温度随弧电流加大而增大的变化趋势也一致。The cumulative ion saturation currents on a cylindrical probe are measured by using a negatively biased,water-cooled cylindrical electrostatic probe sweeping with a fixed speed perpendicularly across a laminar argon plasma jet,and the radial distribution of local ion saturation current density is then obtained by use of the Abel inversion.The radial distribution of the jet impact pressure is also measured dynamically using a water-cooled pressure probe.Based on the measured profiles of the local ion saturation current density and impact pressure and using related theoretical relations,the radial distribution of the plasma jet temperature is deduced.Additionally,the spectroscopic method based on the relative-intensity of spectral lines is employed to measure the plasma jet temperature.Experimental results show that the plasma jet temperature and its variation with arc current measured with these two methods are consistent with each other.

关 键 词：温度测量 层流等离子体射流 离子饱和电流 动压 光谱法 

分 类 号：O536[理学—等离子体物理]