A comparative flow physics study of Ns-DBD vs Ac-DBD plasma actuators for transient separation control on a NACA 0012 airfoil

Claudia Durasiewicz; Ashish Singh; Jesse C Little

doi:10.2514/6.2018-1061

A comparative flow physics study of Ns-DBD vs Ac-DBD plasma actuators for transient separation control on a NACA 0012 airfoil

Claudia Durasiewicz, Ashish Singh, Jesse C Little

Aerospace and Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Scopus citations

Abstract

Nanosecond (ns) and alternating current (ac) dielectric barrier discharge (DBD) plasma actuators are studied in a transient separation control setup. The effects of forcing on flow over a NACA 0012 airfoil in stall (AoA = 18^◦) at a Reynolds number of 740,000 are compared. The flow response to single pulse forcing with time scales much less than the convective time is investigated with the aid of 2-D PIV. The experiment is carried out by phase averaging over different time delays after the actuation pulse ranging t/T_conv = 0 to 10. Pulse energy is varied by a factor of three, but minimal impact on the two actuation mechanisms is observed. The results indicate a somewhat surprising similarity in the global flow response to ns-DBD (thermal) and ac-DBD (momentum) actuation mechanisms. The location, structure and strength of the excited vortical structures are compared and local variations originating from different actuation mechanisms are observed. Ns-DBD induced perturbations are found to be stronger at a given level of electrical energy. However the differences in global flow response are small.

Original language	English (US)
Title of host publication	AIAA Aerospace Sciences Meeting
Publisher	American Institute of Aeronautics and Astronautics Inc, AIAA
Edition	210059
ISBN (Print)	9781624105241
DOIs	https://doi.org/10.2514/6.2018-1061
State	Published - Jan 1 2018
Event	AIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States Duration: Jan 8 2018 → Jan 12 2018

Other

Other	AIAA Aerospace Sciences Meeting, 2018
Country	United States
City	Kissimmee
Period	1/8/18 → 1/12/18

ASJC Scopus subject areas

Aerospace Engineering

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A comparative flow physics study of Ns-DBD vs Ac-DBD plasma actuators for transient separation control on a NACA 0012 airfoil. / Durasiewicz, Claudia; Singh, Ashish; Little, Jesse C.

AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Durasiewicz, C, Singh, A & Little, JC 2018, A comparative flow physics study of Ns-DBD vs Ac-DBD plasma actuators for transient separation control on a NACA 0012 airfoil. in AIAA Aerospace Sciences Meeting. 210059 edn, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA Aerospace Sciences Meeting, 2018, Kissimmee, United States, 1/8/18. https://doi.org/10.2514/6.2018-1061

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abstract = "Nanosecond (ns) and alternating current (ac) dielectric barrier discharge (DBD) plasma actuators are studied in a transient separation control setup. The effects of forcing on flow over a NACA 0012 airfoil in stall (AoA = 18◦) at a Reynolds number of 740,000 are compared. The flow response to single pulse forcing with time scales much less than the convective time is investigated with the aid of 2-D PIV. The experiment is carried out by phase averaging over different time delays after the actuation pulse ranging t/Tconv = 0 to 10. Pulse energy is varied by a factor of three, but minimal impact on the two actuation mechanisms is observed. The results indicate a somewhat surprising similarity in the global flow response to ns-DBD (thermal) and ac-DBD (momentum) actuation mechanisms. The location, structure and strength of the excited vortical structures are compared and local variations originating from different actuation mechanisms are observed. Ns-DBD induced perturbations are found to be stronger at a given level of electrical energy. However the differences in global flow response are small.",

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