电晕风强化对流换热的场协同分析与优化  

Field Synergy Analysis and Optimization of Convection Heat Transfer Enhanced by Corona Wind

作　　者：王际辉[1,2] 莫小宝 孙志新 胡学功 WANG Jihui;MO Xiaobao;SUN Zhixin;HU Xuegong(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2022年第10期2727-2733,共7页Journal of Engineering Thermophysics

基　　金：国家重点研发计划资助(No.2017YFB0403200)。

摘　　要：本文通过数值模拟得到了EHD强化对流换热中的速度场和温度场,并利用场协同理论对EHD换热强化的机理进行分析。模型中采用线板电极产生电晕风,工质为空气,竖直的板电极同时为热沉。结果显示,在自然对流条件下流道内速度场和温度梯度场的协同程度很差。在单根线电极条件下,EHD力提高了空气流速,并在流道上半段改善了速度场与温度梯度场的协同程度,使得平均对流换热系数提高至自然对流下的2.3倍。将线电极优化为三根后,空气流速和场协同程度进一步提高,平均对流换热系数达到自然对流下的5.2倍。In this work, the velocity and temperature fields of EHD-enhanced convection heat transfer are obtained by means of numerical simulation. The mechanism of the EHD heat transfer enhancement is analyzed according to the field synergy principle. In this model, corona wind is generated in a wire-plate electrode configuration, and the working gas is air. The plate electrode is vertical and also serves as a heat sink. The results show that the synergy degree between the velocity and temperature gradient fields is very low in natural convection. In the case of the singlewire electrode, EHD force increases the air velocity and improves the degree of the field synergy in the upper half of the flow channel, which leads to the average heat transfer coefficient is increased to 2.3 times that of natural convection. By optimizing the number of the wire electrode to 3, the air velocity and field synergy degree are further improved. As a result, the average heat transfer coefficient is increased to 5.2 times that of natural convection.

关 键 词：EHD 电晕风 场协同 对流换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]