针电极正负电晕离子风反推力的对比研究

A Comparative Study on the Reaction Thrust of the Positive and Negative Corona Discharge Ionic Wind of the Needle Electrode

搭建了空气中针电极电晕放电离子风的反推力测试平台,实验测量了在不同电压极性和电极曲率下离子风反推力的大小,得到了针电极所受反推力与各变量之间的关系,并结合相关仿真进行分析。结果表明针电极曲率半径较小时的反推力大于曲率半径较大时的反推力,负极性针尖的反推力大于正极性针尖的反推力。分析得出尖电极前方空间电荷对局部电场及电晕电流的巨大影响是针电极反推力出现极性现象的原因。

A test platform for the reaction thrust of the ionic wind with the corona discharge of the needle electrode in the air was established.The magnitude of the reaction thrust of the ionic wind was measured experimentally at different voltage polarities and electrode curvatures.The relationship between the reaction thrust on the needle electrode and the variables was obtained and analyzed with relevant simulations.The results show that the reaction thrust with a smaller radius of curvature of the needle electrode is greater than that with a bigger one,and the reaction thrust of the negative needle tip is grater than that of the positive one.The analysis shows that the great influence of the space charge in front of the tip electrode on the local electric field and the corona current is the cause of the polarity phenomenon of the reaction thrust of the needle electrode.