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An Investigation of Flow Acceleration and Electromagnetic Absorption Phenomena Induced by Paraelectric and Peristaltic Electrohydrodynamic Effects of the One Atmosphere Uniform Glow Discharge Plasma

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Final rept. 1 Jun 2001-30 Nov 2003

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We took wind tunnel data and were able to demonstrate low speed below 5 msec flow attachment on a NACA 0015 airfoil using OAUGDP plasma actuators. We were able further to demonstrate that only one actuator was sufficient to produce re-attachment, and that this actuator should be located not at the site of the flow separation bubble, but at the leading edge of the airfoil. The plasma actuators not only re-attached the flow, but also stabilized the downstream flow, reduced vortex formation, and increased the stall angle of the airfoil. During these wind tunnel tests, we also demonstrated peristaltic flow acceleration by polyphase RF signals driving a phased sequence of OAUGDP plasma actuators, and we demonstrated the reversal ofthe peristalticaly-induced flow with the reversal of the phase of the driving RF voltage. We also developed and investigated mechanically and electrically robust paraelectric, peristaltic, and combined paraelectric and peristaltic ceramic plasma actuator panels. Among these was a three-dimensional electrohydrodynamic flow acceleration duct that functions like a Glauert wall jet. The most promising design was the combined paraelectric and peristaltic panel, and the EHD flow acceleration duct, in which peristaltic flow from phased electrodes is given an additional boost by paraclectric momentum addition, with no momentum addition counter to the dominant flow to induce turbulence in the boundary layer. At the end of the contract, the ERD duct produced exit velocities more than 9 meterssecond using paraelectric effects alone. We also achieved up to 7 meterssec by pure peristaltic acceleration. We also found that one or more plasma actuators in series could be modeled as a classical Glauert wall jet in the region outside the plasma where electrohydrodynamic effects are no longer dominant.

Subject Categories:

  • Aerodynamics
  • Plasma Physics and Magnetohydrodynamics

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