Study on the Schlieren Photograph of Ionic Wind in the Corona Discharging Field (2nd Report)

It is estimated that the dust collecting characteristics of the electrostatic precipitator (EP) is influenced by the ionic wind (IW) which caused by the corona discharge. For study of this influences, IW at the model EP which had the corona discarging field was observed and photographed by the Schlieren method. Three model EP were one needle to plate electrode, three needles to plate electrode and cylindrical type EP. The results of these experiments were as follws. IW blew from discharging electrode to collecting electrode, and the spurt point of IW coincided with corona point. After the collision to electrode, IW interfered mutually in case of three needles and caused swirl phenomina complicatedly. It was considered that IW brought the accelerating act of dust, reentrainment of the collecting dust and the deposit phenomena on the discharging wire. Authers call IW, causing by negative and positive corona discharge, the negative and positive IW respectively.