气密继电器电弧等离子体热物性参数计算分析  

Analysis on Thermophysical Properties of Arc Plasmasin Gas Sealed Relay

作　　者：翟子楠[1] 王小华[2] 

机构地区：[1]平顶山学院电气与机械工程学院,河南平顶山467000 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高压电器》2016年第11期69-74,共6页High Voltage Apparatus

基　　金：国家高技术研究发展计划(863计划)(2011AA05A121);河南省科技攻关计划项目(152102210091)~~

摘　　要：建立气密继电器电弧流体仿真模型的基础是获得电弧等离子体的热物性参数特性。文中为了获得在300~20 000 K温区,压强0.1、0.4、0.8、1.0 MPa,银蒸汽的比例为1%、10%、50%条件下的N2-Ag等离子体热物性数据,通过最小吉布斯自由能模型计算了N2-Ag等离子体的热力学特性。利用新的势能模型计算了N2-Ag混合等离子体的碰撞积分,进而确定了N2-Ag等离子体的输运特性。同时着重讨论了热物性特性在不同压强和不同银蒸汽含量时的演变情况。结果表明,增大压强能抑制等离子组分的分解反应和电离反应。银蒸汽含量达到50%时对N2-Ag等离子体的热物性参数有显著影响。通过与其他文献比较,计算数据得到有效性验证,可以应用于具有银触头的气密继电器电弧等离子体的仿真建模。The thermophysical properties of arc plasma are essential for setting up physical model of a gas sealed relay. In order to obtain the thermophysical data of N2-Ag arc plasmas in the condition that temperature ranges from 300 to 20 000 K, pressure is 0.1, 0.4, 0.8 and 1.0 MPa, and proportion of Ag vapor is 1%, 10% and 50%, respec-tively, the thermodynamic properties of N2-Ag arc plasmas are calculated using Gibbs free energy minimization. New potential model is adopted to calculate collision integrals of N2-Ag arc plasmas, thus the trans-port properties are determined. Emphasis is put on the evolution of thermophysical properties under different pres-sures and silver vapor proportions. The results indicate that increasing pressure can suppress the decomposition re-action and ion-ization reaction in arc plasmas. When the proportion of Ag vapor reaches 50%, it has a significant impact on the thermophysical properties. The data obtained in this study are validated by literatures, so they can be applied to modelling and simulation of arc plasma in gas sealed relay with silver contacts.

关 键 词：气密继电器 电弧等离子体 热力学特性 输运特性 

分 类 号：TM58[电气工程—电器]