帯電液滴群の内部に挿入した接地針電極からのコロナ放電

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  • Corona Discharge from a Grounded Needle Electrode Inserted into Charged Droplets
  • タイデン エキテキグン ノ ナイブ ニ ソウニュウシタ セッチ ハリデンキョク

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The discharge occurring in a space-charge cloud was investigated by using a cloud of charged droplets. To produce a charged cloud with a difinte space charge density and to cause a reproducible discharge, droplets ejected from an airless nozzle were charged by induction charging and transported by air flow. The transportation of charged droplets by air flow was quite effective to increase the charge quantity of droplets and the charge density of the charged droplets. Corona discharge was observed at a grounded needle electrode inserted into the charged droplet cloud which has a charge density of 13μC/m3 at most. In negatively charged droplets, positive streamer corona was occurred. As the charge density of the cloud increased, the time interval of streamer pulse decreased and shifted to grow corona. In positively charged droplets, the height and the frequency of negative corona pulse increased with the charge density and the velocity of charged droplet cloud.

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