考虑器壁侵蚀影响的低压断路器电弧运动特性仿真及实验

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摘要以磁流体动力学（MHD）为基础建立了考虑器壁侵蚀影响的低压断路器中的电弧的数学模型。在传统的质量、动量和能量守恒方程的基础上增加了器壁材料的浓度方程, 考虑了器壁材料的烧蚀对气体的热动力学特性和传输系数的影响, 并且采用“视角因数法”计算到达器壁的辐射能量。利用基于有限容积法的商业软件对上述模型进行求解, 得出灭弧室内温度场、浓度场、气流场的分布情况以及电压随时间的变化过程。仿真结果表明, 由于灭弧室内“漩涡”的存在使得电弧后方的聚合物蒸气浓度大于电弧前方的聚合物蒸气浓度;由于产气材料的影响, 电弧的最大电压增加了19.2%;产气材料对电弧运动有加速作用, 由于产气材料的影响, 电弧的平均运动速度增加了20.1%。实验结果验证了仿真模型的合理性。

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	马强
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	徐铁军
	孙志强

关键词 ：空气电弧等离子体, 磁流体动力学, 器壁侵蚀, 产气材料

Abstract：The mathematical model of 3-dimentional air arc plasma considering the ablation of lateral walls is set up based on magnetic hydro-dynamics (MHD). The mass concentration equation is introduced to the model on the basis of traditional mass, momentum and energy equations. The influence of wall ablation on the thermodynamic and transport properties is considered. The method of “view factors” is used to calculate the radiation reaching the lateral wall. By adopting the commercial computational fluid dynamics (CFD) package based on control-volume method, the above MHD model is solved and the distribution of temperature field, concentration field, flow field and electrical potential field in the arc chamber is calculated. The simulation results indicate that the vapor concentration behind the arc column is higher than that in front of the arc column because of the existence of “vortex” in the arc chamber. The use of gassing material causes arc voltage increase 19.2%, and causes the average arc velocity increase 20.1%. The experimental results prove the validity of the arc model.

Key words： Air arc plasma magnetic hydro-dynamics (MHD) wall ablation gassing material

收稿日期: 2008-05-21 出版日期: 2014-02-18

PACS:

TM561

基金资助:国家自然科学基金（50477025, 50537050, 50525722）和教育部科学技术研究重点（10518）资助项目

作者简介: 马强男, 1979年生, 博士研究生, 主要研究方向为低压断路器中电弧等离子体的研究。荣命哲男, 1963年生, 教授, 博士生导师, 主要研究方向为电弧与电接触理论、成套开关电器状态监测、电弧等离子体在环保中的应用。

引用本文:

马强, 荣命哲, AnthonyB.Murphy, 吴翊, 徐铁军, 孙志强. 考虑器壁侵蚀影响的低压断路器电弧运动特性仿真及实验[J]. 电工技术学报, 2009, 24(12): 74-81. Ma Qiang, Rong Mingzhe, Anthony B. Murphy, Wu Yi, Xu Tiejun, Sun Zhiqiang. Simulation and Experiment on Airarc Characteristics in Low-Voltage Circuit Breaker Considering Wall Ablation. Transactions of China Electrotechnical Society, 2009, 24(12): 74-81.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2009/V24/I12/74

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