不同湿度下空气的流注放电特性

发布时间：2018-03-25 07:35

本文选题：流注放电　切入点：光电离　出处：《高电压技术》2015年02期

【摘要】：目前流注放电过程的相关研究主要是针对氮气和空气流注放电过程进行的数值模拟研究。实际的输变电工程间隙的空气中不可避免含有一定量水分子,为研究湿度对空气中的流注放电过程的影响,采用流体模型仿真了干燥空气和分别含80 Pa、400 Pa、1 867 Pa水蒸气的空气的双向流注传播过程,光电离作为源项加在流体模型上。水蒸气对光电离的影响主要有2方面:一是吸收函数;二是发射光强。仿真结果表明:不同空气湿度下正、负流注头部电子数密度均为1.6×1014 cm-3和0.7×1014 cm-3,平均传播速度均约为1.5×108 cm/s,流注头部半径约为0.4 mm;不同空气湿度下,若光电离强度均达到1021 cm-3·s-1量级能够提供足够多的种子电子,则湿度对流注传播特性影响不大,其主要原因是不同湿度下的电子输运系数和反应系数差别很小。
[Abstract]:At present, the research of flow discharge process is mainly about numerical simulation of nitrogen and air flow discharge process. Some amount of water molecules are inevitable in the air of actual transmission and transformation engineering. In order to study the effect of humidity on the flow discharge process in air, a fluid model was used to simulate the bidirectional flow propagation process of dry air and air containing 80 Pax 400 Pa1 867 Pa water vapor, respectively. Photoionization is added to the fluid model as a source term. There are two main effects of water vapor on photoionization: one is the absorption function, the other is the emission intensity. The simulation results show that the effect of water vapor on photoionization is positive at different air humidity. The electron number density of the negative stream head is 1.6 脳 1014 cm-3 and 0.7 脳 1014 cm ~ (-3), the average propagation velocity is about 1.5 脳 10 ~ 8 cm ~ (-1) 路s ~ (-1) and the head radius of the flow beam is about 0.4 mm. At different air humidity, the photoionization intensity of 1021 cm-3 s ~ (-1) can provide enough seed electrons. The main reason is that the electron transport coefficient and the reaction coefficient under different humidity have little difference.
【作者单位】：东北电力大学;清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室;
【基金】：国家自然科学基金(51207019)~~
【分类号】：TM72

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