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The wake flow control behind a circular cylinder using ion wind

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Abstract

Active and passive flow control methods have been studied for decades, but there have been only a few studies of flow control methods using ion wind, which is the bulk motion of neutral molecules driven by locally ionized air from a corona discharge. This paper describes an experimental study of ion wind wake control behind a circular cylinder. The experimental conditions consisted of a range of electrohydrodynamic numbers—the ratio of an electrical body force to a fluid inertial force—from 0 to 2 and a range of Reynolds numbers from 4×103 to 8×103. Pressure distributions over the cylinder surface were measured and flow visualizations were carried out using a smoke-wire method. The flow visualizations confirmed that ion wind significantly affects the wake structure behind a circular cylinder, and that the pressure drag can be dramatically reduced by superimposing ion wind.

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Abbreviations

BR :

blockage ratio

C d :

coefficient of the pressure drag

C p :

coefficient of the surface pressure, 2(p−p 0)/(ρU 0 2)

C pb :

coefficient of the base surface pressure, 2(p b−p 0)/(ρU 0 2)

D :

diameter of the cylinder

D P :

pressure drag

d p :

diameter of particle

E :

the electric field

F e :

Coulombian force (qE)

F v :

viscous force

H :

wire-to-cylinder spacing

I :

total electric current (A)

L :

the axial length of cylinder (m)

N EHD :

electrohydrodynamic number

p b :

base pressure of cylinder at θ=180°

p 0 :

reference static pressure at 10D upstream

q :

the charge on the particle

R :

radius of the cylinder

V :

applied voltage (kV)

U 0 :

mean flow velocity (m/s)

β :

ion mobility in air (m2/(s V))

ε 0 :

permittivity of free space

μ :

viscosity of fluid (kg/ms)

ρ :

density of fluid (kg/m3)

θ :

installation angle of a wire electrode (°)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, 790-784, Pohang, South Korea

    K. T. Hyun & C. H. Chun

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  1. K. T. Hyun
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  2. C. H. Chun
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Correspondence to K. T. Hyun.

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Hyun, K.T., Chun, C.H. The wake flow control behind a circular cylinder using ion wind. Exp Fluids 35, 541–552 (2003). https://doi.org/10.1007/s00348-003-0668-z

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