2-D electrohydrodynamic simulations towards zero offset voltage with corona ionisers |
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Authors: | A Ohsawa |
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Institution: | Electrical Safety Research Group, National Institute of Occupational Safety and Health, 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan |
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Abstract: | This paper reports results from a computational investigation of charge neutralisation with DC, AC, and pulse-DC corona ionisers using 2-D axisymmetric electrohydrodynamic modelling with an emphasis on minimising the offset voltage. The results showed that balanced DC ionisers can effectively neutralise the charge of a conductive plate; however, balanced AC and pulse-DC ionisers give rise to a certain offset voltage with an oscillation caused by alternate mono-polar space charges created near the ionisers resulting from ions emitted from the ionisers. In addition, we suggest a modification for AC and pulse-DC ionisers to minimise the offset voltage, including its AC component. Consequently, we found that continuously balanced ions emitted from ionisers which can create a quasi-neutralised charge distribution by positive and negative ions in the entire space at a steady state are of significant importance to make the offset voltage zero. |
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