Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Controlling the Flow around a Circular Cylinder by Means of a Corona Discharge. / Renev, M.E.; Safronova, Yu.F.; Stishkov, Yu.K.
в: Technical Physics, Том 64, № 9, 01.09.2019, стр. 1275–1282.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Controlling the Flow around a Circular Cylinder by Means of a Corona Discharge
AU - Renev, M.E.
AU - Safronova, Yu.F.
AU - Stishkov, Yu.K.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - The effect of electric wind produced by a positive corona discharge on the air flow around a circular cylinder at Reynolds numbers of 2400 and 3200 is investigated. The geometry of cylinder–wire electrodes is considered for two positions of the corona electrode relative to the cylinder: one wire behind the cylinder and two symmetrical wires above and below the cylinder. A direct numerical simulation of the electrohydrodynamic problem is performed using an original unipolar model of the corona discharge. The effect of a thin jet of electric wind directed from the corona electrode to the cylinder on the structure of the vortex wake behind the cylinder and the drag force is considered. It is shown that, when two corona electrodes are located above and below the cylinder, the electric wind prevents the formation of a Karman vortex street and significantly reduces the air drag of the cylinder. If the discharge electrode is located behind the cylinder, the corona discharge and the electric wind lead to the formation and development of large vortices in the wake behind the cylinder, which leads to significant fluctuations in its air drag. It is shown that a corona discharge significantly changes the characteristics of the Karman vortex street: as the voltage increases to 30 kV, the vortex shedding frequency decreases by a factor of 2.5 and the sizes of the vortices and their rotation velocity noticeably increase. The drag force is quasi-periodic and its mean value linearly depends on the corona voltage.
AB - The effect of electric wind produced by a positive corona discharge on the air flow around a circular cylinder at Reynolds numbers of 2400 and 3200 is investigated. The geometry of cylinder–wire electrodes is considered for two positions of the corona electrode relative to the cylinder: one wire behind the cylinder and two symmetrical wires above and below the cylinder. A direct numerical simulation of the electrohydrodynamic problem is performed using an original unipolar model of the corona discharge. The effect of a thin jet of electric wind directed from the corona electrode to the cylinder on the structure of the vortex wake behind the cylinder and the drag force is considered. It is shown that, when two corona electrodes are located above and below the cylinder, the electric wind prevents the formation of a Karman vortex street and significantly reduces the air drag of the cylinder. If the discharge electrode is located behind the cylinder, the corona discharge and the electric wind lead to the formation and development of large vortices in the wake behind the cylinder, which leads to significant fluctuations in its air drag. It is shown that a corona discharge significantly changes the characteristics of the Karman vortex street: as the voltage increases to 30 kV, the vortex shedding frequency decreases by a factor of 2.5 and the sizes of the vortices and their rotation velocity noticeably increase. The drag force is quasi-periodic and its mean value linearly depends on the corona voltage.
KW - EHD flow
KW - Karman vortex street
KW - boundary layer separation control
KW - drag coefficient
KW - electric (ionic) wind
KW - positive corona discharge
UR - http://www.scopus.com/inward/record.url?scp=85073258751&partnerID=8YFLogxK
U2 - 10.1134/S1063784219090147
DO - 10.1134/S1063784219090147
M3 - Article
VL - 64
SP - 1275
EP - 1282
JO - Technical Physics
JF - Technical Physics
SN - 1063-7842
IS - 9
ER -
ID: 46278343