Influence of discharge energy on the lift and drag forces induced by a nanosecond-pulse-driven plasma actuator. (4th June 2019)

• Record Type: Journal Article
• Authors: Komuro, Atsushi; Takashima, Keisuke; Suzuki, Kento; Kanno, Shoki; Nonomura, Taku; Kaneko, Toshiro; Ando, Akira; Asai, Keisuke
• Is Part Of: Plasma sources science & technology. Volume 28:Number 6(2019:Jun.)
• Publication Date: 2019-06-04
• Subjects: plasma actuator -- nanosecond pulse discharge -- flow-separation control -- surface dielectric barrier discharge; Plasma (Ionized gases) -- Periodicals; 530.44
• DOI: 10.1088/1361-6595/ab1daf
• Languages: English
• ISSNs: 0963-0252

Abstract

Abstract: 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.