摘要
弓网电弧在接触面上产生的瞬时高温是造成接触面材料烧蚀的主要原因。研究弓网电弧的温度分布特征,有助于改进接触面材料,增强其耐电弧侵蚀能力,进而提高弓网系统服役性能。本文基于磁流体动力学(MHD)理论,考虑电弧的物理参数以及电磁、热和辐射等现象,建立弓网电弧数学模型。通过对流体力学计算软件FLUENT进行二次开发,计算了静态弓网电弧弧柱区域和两极板表面的温度分布。结果表明:电弧极板表面温度低于电弧弧柱温度,受电弓滑板表面温度高于接触网导线表面温度;提高滑板材料的热导率能够有效降低电弧发生时受电弓滑板表面的温度。
The transient high temperatures generated by pantograph-catenary arc on the electrode surfaces are the major cause that leads to the serious erosion of the electrode materials. Study on the temperature distribution characteristics of pantograph catenary arc is conducive to the improvement of contact materials and enhancement of the arc erosion resistance ability, so as to further improve the service performance of the panto- graph catenary system. Based on MHD theory, considering the physical properties of the arc and the electro- magnetic, heat and radiation phenomena, a pantograph-catenary arc mathematical model was established. Fluid dynamics software FLUENT was adapted and extended by self-written routines, and a geometry model of static pantograph-catenary arc was built to simulate the temperature distribution of arc column, arc cathode and arc anode. The results indicated that the temperatures of the surface of electrodes were lower than that of the arc column region, and the surface temperature of pantograph slider was higher than that of the catenary wire. To reduce the surface temperature of pantograph slider when arc occurs, the improvement of the thermal conduc- tivity of materials of pantograph slider is an effective method.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2015年第5期21-26,共6页
Journal of the China Railway Society
基金
国家自然科学基金(U1234202
51177136
51325704)
"十二五"国家重点基础研究发展计划(973计划)(2011CB711105-4
51325704)
关键词
弓网电弧
MHD模型
温度场
热导率
pantograph-catenary arc
MHD model
temperature field
thermal conductivity
