Affiliations: Department of Electrical Engineering, Tokai
University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan.
E-mail: rohyama@keyaki.cc.u-tokai.ac.jp | Graduate School of Engineering, Tokai University, 1117
Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Abstract: Experimental visualization for ionic wind motion originated from DC
corona discharges in a needle-plate electrode system has been investigated. A
vapor-phase biacetyl tracer with laser-induced phosphorescence emission is used
for optically characterizing the ionic wind profile. The ionic wind blows the
excited biacetyl molecules away in continuing the visible phosphorescence
emission for a long radiative lifetime. The captured image with elapsing time
from the excitation presents the shifting location of radiative tracer along
the ionic wind direction. The experimental results show the ionic wind profile
enhanced in the electric field direction corresponding to the corona discharge
progress. Especially, the ionic wind near an initiating point of corona
discharges is focused as an advantage of this optical technique. The ionic wind
velocity along the electrode axis can be obtained at the location close enough
to the corona discharge initiation point, and the velocity at 0.5 mm from the
discharge point is figured out as 9.3 to 19.2 m/s under the condition of the
EHD Reynolds number of 0.95 × 10^3 to 2.1 × 10^3.
