N U M E R I C A L S I M U L A T I O N O F P L A S M A A C T U A T O R I N B O U N D A R Y L A Y E R S E P A R A T I O N C O N T R O L B Y U T I L I Z I N G T H E M O D I F I E D E L E C T R O S T A T I C M O D E L

Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Currently, the Dielectric Barrier Discharge (DBD) plasma actuators are going to be one of the most promising active flow control devices. They have a significant effect on the flow characteristics such as reducing the drag, postponing the laminar to turbulent flow transition, suppressing the separation and noise reduction. Here, a Single Dielectric Barrier Discharge (SDBD) plasma actuator, installed at the leading edge of a NACA0015 airfoil, was used to control the flow separation at a high angle of attack in a steady condition. The actuator was supplied with a 9kV voltage. The air flow was considered turbulent incompressible flow with a Reynolds number of about 500,000. An SDBD plasma actuator can generate a wall-bounded jet without any mechanical moving parts. Lack of a reliable simulation model prevents wider application of such DBD actuators. A complete numerical simulation of interactions of the electrostatic and the fluid flow field is very time-consuming. In this study, a semi-empirical Electrostatic model, with the plasma actuator induced body force, with two simple equations to predict the electrostatic filed, is used. To describe the two-dimensional flow field induced by the actuator, the body force is added to the CFD solver as a source term. The Electrostatic model solves the electrical potential and plasma concentration equations around the DBD electrodes by rectifying the plasma distribution over the aerodynamic surface, a modified form of the model is utilized which is shown to produce results close to the experimental data. The accuracy of the used model is indicated with the validation of fluid flow solution and modified electrostatic model with credit experimental results in the literature. It is shown that by employing a plasma actuator, the separation angle of attack increases from 15 to 21 degrees. The maximum lift coefficient is improved about 30-percent, while the maximum lift to drag ratio is improved more than 15%.
Language:
Persian
Published:
Mechanical Engineering Sharif, Volume:34 Issue: 1, 2018
Pages:
23 to 33
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