TY - JOUR
T1 - Influence of discharge energy on the lift and drag forces induced by a nanosecond-pulse-driven plasma actuator
AU - Komuro, Atsushi
AU - Takashima, Keisuke
AU - Suzuki, Kento
AU - Kanno, Shoki
AU - Nonomura, Taku
AU - Kaneko, Toshiro
AU - Ando, Akira
AU - Asai, Keisuke
N1 - Publisher Copyright:
© 2019 IOP Publishing Ltd.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/6/4
Y1 - 2019/6/4
N2 - Wind tunnel experiments at a flow velocity of 40 m s-1 with a nanosecond-pulse-driven plasma actuator (ns-DBDPA) on an airfoil have been performed (i) to study discharge parameters inducing the ns-DBDPA flow control effect and (ii) to investigate discharge-mediating flow parameters representing the induced discharge-flow interactions. The lift and drag forces' measurements demonstrate that, in addition to the well-known frequency effect, the discharge energy per pulse can be the key discharge parameter representing the ns-DBDPA effect on the forces rather than the discharge power under various discharge energy per pulse raised up to 80 mJ m-1 and discharge frequencies ranged from 10 to 1600 Hz. In a single pulse operation free from the discharge frequency effect, Schlieren imaging and particle image velocimetry show that the dynamic of two heated zones generated by ns-DBDPA is identical to those of the induced two vortices. This discharge-flow interaction observed under the frequency-free condition implies that the key discharge mediating flow parameter can lie in the identical dynamics of the heated zones. This study suggests that the discharge-mediating flow parameters for the discharge-flow interaction leading to the flow control effect on the forces can be a statistical variation in the Schlieren image intensity or the angles of the heated zones' trajectories.
AB - Wind tunnel experiments at a flow velocity of 40 m s-1 with a nanosecond-pulse-driven plasma actuator (ns-DBDPA) on an airfoil have been performed (i) to study discharge parameters inducing the ns-DBDPA flow control effect and (ii) to investigate discharge-mediating flow parameters representing the induced discharge-flow interactions. The lift and drag forces' measurements demonstrate that, in addition to the well-known frequency effect, the discharge energy per pulse can be the key discharge parameter representing the ns-DBDPA effect on the forces rather than the discharge power under various discharge energy per pulse raised up to 80 mJ m-1 and discharge frequencies ranged from 10 to 1600 Hz. In a single pulse operation free from the discharge frequency effect, Schlieren imaging and particle image velocimetry show that the dynamic of two heated zones generated by ns-DBDPA is identical to those of the induced two vortices. This discharge-flow interaction observed under the frequency-free condition implies that the key discharge mediating flow parameter can lie in the identical dynamics of the heated zones. This study suggests that the discharge-mediating flow parameters for the discharge-flow interaction leading to the flow control effect on the forces can be a statistical variation in the Schlieren image intensity or the angles of the heated zones' trajectories.
KW - Plasma actuator
KW - flow-separation control
KW - nanosecond pulse discharge
KW - surface dielectric barrier discharge
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U2 - 10.1088/1361-6595/ab1daf
DO - 10.1088/1361-6595/ab1daf
M3 - Article
AN - SCOPUS:85069496334
VL - 28
JO - Plasma Sources Science and Technology
JF - Plasma Sources Science and Technology
SN - 0963-0252
IS - 6
M1 - 065006
ER -