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Numerical Simulation of DBD Plasma Actuator and Optimization for Separation Control

Omidi, Javad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47098 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mazaheri, Karim
  7. Abstract:
  8. Here we have used CFD to simulate the flow field around a DBD plasma active controller for flow control. Enhanced Electrostatic model is applied to model the plasma actuator, by solution of two elliptic equations to find electric field and charge density in whole flow field. So, it provided the body force by neglecting the magnetic forces in Lorentz equation. The body force is added to the momentum equation as a source term. A commercial software FLUENT is used for this simulation. To validate the algorithm, flow over a flat plate using DBD actuator is solved and results are compared with experimental and numerical results. Flow control around a cylinder with Reynolds number of 18,000 is studied, and location of DBD actuator on aerodynamic performance is investigated. It is shown that effect of drag and lift oscillating may be controlled by this actuation. The DBD actuator is also applied to a 2D wind turbine airfoil DU 91-W2-250 with Reynolds number of 106. Plasma actuator is installed in three locations 30, 50 and 70% of the chord length from leading edge. The results show that the plasma actuator mounted near the separation point is the best location for placement of actuator. Finally, flow control around a NACA0015 airfoil is investigated. Here Reynolds number is 500,000. Comparison with experimental data is done to show accuracy of DBD modeling. Several optimization tasks including actuator location, applied voltage and configuration of DBD to improve performance of airfoil are investigated, and optimum values are sought
  9. Keywords:
  10. Numerical Modeling ; Optimization ; Flow Separation ; Electrostatic Actuator ; Dielectric-Barrier Discharge (DBD)Plasma Actuator

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