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Comparison of Positive and Negative Ionic Wind in Needle-to-Plate Corona Discharge

MIAO Jin-song;CHEN Yang;ZHANG Yu;JIN Zhen-gang;School of Physics,Beijing Institute of Technology;  
The needle-to-plate configuration was employed in this paper to investigate the characteristics of ionic wind in corona discharge.The wind velocity and wind pressure were measured experimentally under different conditions including the voltage polarity,the applied voltage,the electrode spacing and the radius of needle tip and so on,to analyze the effect of these factors on ionic wind.The results show that the velocity increases linearly with the over-voltage.Under the same conditions the inception voltage of the positive corona is higher than the negative.The wind velocity of positive corona is higher than the negative at the same over-voltage and electrode spacing.And the polarity effect comes from the difference of developing mechanism between the positive and negative corona.
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