Design Optimization of Micro Synthetic Jet Actuator for Flow Separation Control

Abstract

A computational analysis and design methodology is presented for effective microflow control using synthetic jets. The membrane is modeled as a moving boundary to accurately compute the flow inside the jet cavity. Compressible Navier-Stokes equations are solved with boundary conditions for the wall slip and the temperature jump conditions encountered for a specific range of Knudsen numbers. For validation, microchannel flow and microfilter flow are successfully computed. Then, flow past a backward-facing step in a microchannel is considered. Analysis is coupled with a design methodology to improve the actuator effectiveness. The objective function is selected to be the square of the vorticity (enstrophy) integrated over a separated region. First, from a design of experiments study, orifice and actuator cavity widths are identified as the most effective design variables. Then, a response surface method is constructed to find the improved control of the flow. This optimization results in more than 83% reduction of the enstrophy of the recirculation region.

Piezoelectric Actuators as Synthetic Jets: Cavity Dimension Effects

“…By using a two-level experimental design, velocity profiles formed at the orifice exit are used as the establishing criteria. Previous work has demonstrated that cavity height and orifice dimensions are important parameters affecting the performance of the jet (Crook et al, 1999;Baysal et al, 2004;Mossi et al, 2005;Mossi and Bryant, 2004c). Baysal et al utilized a design of experiments methodology to show that the width of the actuator cavity and the frequency of its oscillations are the most effective design variables.…”

Application of a Synthetic Jet to Control Boundary Layer Separation under Ultra-High-Lift Turbine Pressure Distribution

“…[6,[8][9][10][11]). Most of them are summarized in a recent review by Zhang et al [12], in which experimental and numerical data have been collected.…”

Study on flow distribution inside integrated hybrid actuator

“…John et al [2] also studied the parameter of the pump for the maximum actuating velocity by investigating the internal flow distribution of the micro pump. Furthermore, a fluidic diode was designed and tested for a hybrid jet actuator [3], and design optimization and fabrication of jet actuators were performed for flow separation control [4][5][6].…”