Influence of discharge energy on the lift and drag forces induced by a nanosecond-pulse-driven plasma actuator

• Published in: Plasma sources science & technology 2019-06, Vol.28 (6), p.65006
• Main Authors: Komuro, Atsushi, Takashima, Keisuke, Suzuki, Kento, Kanno, Shoki, Nonomura, Taku, Kaneko, Toshiro, Ando, Akira, Asai, Keisuke
• Format: Article
• Language: English
• Subjects: flow-separation control; nanosecond pulse discharge; plasma actuator; surface dielectric barrier discharge
• ISSN: 0963-0252; 1361-6595; 1361-6595
• DOI: 10.1088/1361-6595/ab1daf

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.