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Control and Scaling of Radius-Vectored Turbulent Boundary Layers Using Plasma Actuators

Control and Scaling of Radius-Vectored Turbulent Boundary Layers Using Plasma Actuators. T . Corke and R. Hewitt Center for Flow Physics and Control Aerospace and Mechanical Engineering University of Notre Dame. Objectives:.

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Control and Scaling of Radius-Vectored Turbulent Boundary Layers Using Plasma Actuators

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  1. Control and Scaling of Radius-Vectored Turbulent Boundary Layers Using Plasma Actuators T. Corke and R. Hewitt Center for Flow Physics and Control Aerospace and Mechanical Engineering University of Notre Dame 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  2. Objectives: • Investigate physics and scaling of SDBD Plasma Actuators for flow separation control on TE radii. • Parameters: Radius, TBL thickness, free-stream speed. • Develop designs for flow separation control associated with airframe noise. 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  3. Motivation: Airframe Noise Control -13.3 dB 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  4. dielectric exposed electrode covered electrode substrate AC voltage source SDBD Plasma Actuators Induced Flow Ref:AIAA J., 42, 3, 2004 Prog. Aero. Sci., 2007 (In press). 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  5. Coanda Effect: No external flow Plasma actuator (90 deg.) Plasma Actuators (90 & 270 deg.) Plasma-induced Coanda effect Plasma actuators 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  6. Coanda Effect No External Flow 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  7. Experimental Approach: Effect of External Flow 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  8. Experimental Setup Light Sheet Flow 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  9. Results: Particle Visualization Baseline R=10.4 cm (4.1in) U∞=6 m/s 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  10. Results: Particle Visualization 15.2kV 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  11. Results: Particle Visualization 18.6kV 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  12. Results: Particle Visualization 22.4kV 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  13. Results: Particle Visualization 25.5kV 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  14. Results: Particle Visualization 28.5kV 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  15. Surface Flow Visualization • Measurements of separation location was done using surface flow visualization • Mixture of evaporating oil and china clay. • Applied on radius surface • Oil moves according to local wall shear stress. 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  16. Results: Separation Location xs • Summary: • Min. Sensitivity to FS • Velocity. • Baseline separation • location moves • upstream with • decreasing radius. • Linear dependence of • xs on actuator voltage Decreasing R 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  17. Results: Flow Turning Angle  =xs/R Decreasing R • Summary: • Min. Sensitivity to FS • Velocity. • Response of Actuator • increases with • decreasing radius 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  18. Results: Flow Turning Angle Decreasing R 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

  19. Summary: • SDBD plasma actuators effective in controlling flow separation around a trailing-edge radius in which the approaching flow is a turbulent boundary layer. • Minimum Sensitivity to Free-stream Velocity. • Baseline separation location moves upstream with decreasing radius. • Linear dependence of xs on actuator voltage. • Response of Actuator increases with decreasing radius. • Minimum sensitivity to TBL thickness. • Up to 50% recovery of wake momentum in experiment. • Smaller radii more effective. 60th Annual Meeting of the APS Division of Fluid Dynamics Salt Lake City, Utah

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