Role of Secondary Ions on the i-v Characteristics of Oxyfuel Flame Subject to an Electric Field
Role of Secondary Ions on the i-v Characteristics of Oxyfuel Flame Subject to an Electric Field
复制标题
二次离子对电场作用下富氧火焰 i-v 特性的影响
DOI：
10.1115/1.4056845
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Martin, Christopher R.
中科院分区：
文献类型：
--
作者：
Untaroiu, Alexandrina;Rahman, S. M.;Martin, Christopher R.
最近使用的离子电流作为一种传感策略，在机械化的氧燃料切割过程中激发了一系列的研究，这表明，钢工件贡献二次离子，除了经典的氧燃料火焰中确定的主要离子。在这项工作中，我们提出了一个计算模型，连接碳相关的化学离子作为二次离子源的氧燃料切割过程中的预热阶段受偏压。火焰对不同正负极性电场的响应，体现了对电流-电压（i-v）关系物理行为的更好理解。虽然铜表面具有稳定和可重复的i-v特性，但在钢表面的正饱和区观察到零星增强的电流，这被认为是由于二次化学离子的存在。在这种程度上，气态碳的源项已被分配到模仿的“工作面”的反应。假设是，由于碳是一种重要的元素，它将从钢表面扩散出来并蒸发到火焰中。
Recent use of ion currents as a sensing strategy in the mechanized oxyfuel cutting process motivated a series of studies which revealed that the steel work piece contributes secondary ions in addition to the primary ions classically identified in the oxyfuel flame. In this work, we present a computational model that has linked carbon-related chemi-ions as a source of secondary ions in preheating stage of oxyfuel cutting process subject to electric bias voltages. The flames' response to the electric field at different positive and negative polarities manifested a better understanding of the physical behavior of current-voltage (i-v) relationship. While copper surface exhibits stable and repeatable i-v characteristics, sporadically enhanced current was observed in positive saturation regime for steel surface, and this is believed to be due to the presence of secondary chemi-ions. To this extent, a source term of gaseous carbon has been assigned to mimic the ‘work surface’ reactions. The hypothesis is that since carbon is an important element, it will be diffusing out of the steel surface and evaporate into the flame.