Spatially Resolved Ion Density Measurements in an Oxyfuel Cutting Flame
Spatially Resolved Ion Density Measurements in an Oxyfuel Cutting Flame
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DOI：
10.1080/00102202.2020.1792458
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发表时间：
2020-07
影响因子：
1.9
通讯作者：
C. Martin;A. Untaroiu;K. Xu
中科院分区：
文献类型：
--
作者：
C. Martin;A. Untaroiu;K. Xu
摘要提出了一种新的朗缪尔探头，用于稠密流动等离子体中的空间分辨离子密度测量。这项技术使用旋转的圆盘在火焰中快速传递金属探头。空间分辨率是通过对收集到的多个导线位置的数据进行后处理来实现的。该技术在3000K大气压火焰中以0.5 mm的分辨率分辨离子密度。所研究的氧燃料切割火炬火焰有12个中空锥体，底面1 mm，高度4 mm，表面离子密度m。圆锥体的底部形成一个环，其内径显示出同样大的离子密度，而外径似乎被夹带的空气削弱。离子密度在毫米尺度上从它们在内锥体中的峰值衰减，形成一个离子密度在m量级的半均匀环。
ABSTRACT A novel variation of the Langmuir probe for spatially resolved ion density measurements in a dense flowing plasma is presented. The technique uses a spinning disc to rapidly transit a wire probe through the flame. Spatial resolution is accomplished by post-processing data collected with many wire locations. The technique resolves ion density with a resolution of 0.5 mm in a 3000 K atmospheric pressure flame. The oxyfuel cutting torch flame under study is found to have twelve hollow cones with a 1 mm base and 4 mm height with ion density m along their surface. The base of the cones forms a ring, the inner diameter of which exhibits similarly large ion density, while the outer diameter appears to be weakened by entrained air. The ion densities decay over mm length scales from their peaks in the inner cones to form a semi-homogeneous annulus with ion density on the order m .