作　　者： ; ; ; ;

机构地区： 浙江大学机械与能源工程学院能源清洁利用国家重点实验室

出　　处： 《物理学报》 2011年第3期398-404,共7页

摘　　要： 滑动弧等离子体的电弧温度场、电场和导电区域尺寸是确定电子温度、电子密度、化学反应速率以及能量效率的重要参数.对气流量为1.43L/min和6.42L/min时50Hz交流滑动弧放电的电参数进行了测量;用瞬态的电弧模型描述滑动弧的能量传递,并用近似的介质电导率和热扩散系数对模型进行简化,解决了由于电弧结构变化所导致的移动边界问题;模拟求得等离子体的电弧结构、电场强度和动态温度场等参数的演化.其中,电弧电场的模拟值与实验值基本符合,计算得到电弧轴心温度可以达到5700—6700K.研究结果表明,气流直接影响电弧结构和电流密度进而影响电弧电场和温度分布,在一个放电周期中电场呈先减小后增大的趋势. The arc temperature field,electric field and size of conducting zone of gliding arc plasma are important parameters to determine the temperature and density of the electrons,the chemical reaction rates and energy efficiency. Electrical parameters of a 50 Hz ac gliding arc discharge were measured under conditions of two gas flow rates,1. 43 L /min and 6. 42 L /min. An instantaneous model which was used to describe the energy transfer of gliding arc discharge was simplified by using an approximate expression for the electrical conductivity and diffusivity of plasma,which ravelled out the moving boundary in the gliding arc simulation resulting from variation of arc structure. The current density,electric field,dynamic temperature field and the structure of ac gliding arc was calculated. The electric field strength from the simulation result of the model was in agreement with the experimental data. According to the calculational result,the temperature on the axis of arc reached as high as 5700—6700 K. It showed the gas flow directly affected the arc structure and current density,thus further affected the electric field strength and temperature distribution. The electric field strength increased firstly and then decreased during a discharge period.

关 键 词： 滑动弧等离子体 温度场 电场强度 导电半径

领　　域： [理学] [理学]