Flow control with plasma‐based actuator in different velocity regimes: Momentum and heat transfer effects

Abstract

In this study, control of the airflow by the direct current (DC) electrical discharge with bare electrodes has been investigated in different velocity regimes. The discharge characteristics of the plasma model are obtained numerically. An induced electrohydrodynamic (EHD) force on neutral flow was characterized based on momentum transfer from charged particles. The change in the incident flow parameters was studied by applying Navier-Stokes (N-S) equations, considering source terms arising from a weakly ionized plasma. The effect of the discharge on the lowand high-speed flow was simulated in this study. It was concluded that the changes of the velocity profile, airflow pressure, and oblique shock wave could be attributed to the EHD force from a nonthermal plasma to the incoming airflow. It was seen that the incident airflow is accelerated also by the induced EHD force. Our results show that the most important mechanism in the plasma-based flow control is the momentum transfer from the electrical discharge to the incident flow and that the gas heating has no significant role. K E Y W O R D Selectrical discharge, flow control, plasma actuator

Differential evolution algorithm for performance optimization of the micro plasma actuator as a microelectromechanical system

“…The Electro-Hydro-Dynamic (EHD) body force is due to the momentum transfer from the charged particles to the neutral ones through collisions. As described in details in 56 , 57 , the true EHD body force is comprised of linear and nonlinear terms. The linear terms include the conduction terms of the current densities, the diffusion, and the charged particle generation 56 , 58 .…”

“…As described in details in 56 , 57 , the true EHD body force is comprised of linear and nonlinear terms. The linear terms include the conduction terms of the current densities, the diffusion, and the charged particle generation 56 , 58 . The non-linear term which is recently discussed by Mahdavi and Sohbatzadeh 57 , depends on the gradient of the electric field intensity and the variation of the plasma dielectric permittivity.…”

The Role of Nonlinear Body Force in Electrostatic Propeller Driven by Atmospheric DC Corona Discharges

“…It was also shown that the direction of the nonlinear body force in both positive and negative corona discharges is always from the wire to the cylinder. To consider the influence of linear (Coulomb force) and nonlinear body force in wire-cylinder configuration, the results of references [34][35][36] were used for both coronas. It was demonstrated that during the running of both coronas the electric current can be decomposed into DC and AC signals that characterize the corona process and distinguish positive and negative coronas.…”