A piezoelectrically actuated micro synthetic jet for active flow control

The synthetic jet actuator (SJA) is a low power, highly compact microfluidic device which has potential application in boundary layer flow control. In recent work we have shown how synthetic jets work without cross flow and how effectively they modify the flow structure in the boundary layer under an adverse pressure gradient. This paper describes the piezoelectric synthetic jet actuator used in our experiments. The experimental set-up for flow control using this type of actuator is detailed. The results obtained show a significant enhancement of the jet effectiveness by forcing the boundary layer flow at the natural instability frequency. The actuators must have sufficient velocity output to produce strong enough vortices if they are to be effective for flow control. The forcing effect can occur at a frequency lower than the driving frequency of the actuator when used without cross flow. The forcing frequency appears to be an important parameter in synthetic jet boundary layer flow control.

[1]  A. Crook,et al.  The development and implementation of synthetic jets for the control of separated flow , 1999 .

[2]  Robert G. Bryant,et al.  Development of synthetic jet actuators for active flow control at NASA Langley , 2000 .

[3]  S. G. Mallinson,et al.  An experimental and numerical study of synthetic jet flow , 2001, The Aeronautical Journal (1968).

[4]  Klaus Gersten,et al.  Boundary-Layer Theory - 8th Revised and Enlarged Edition , 2000 .

[5]  Israel J Wygnanski,et al.  Boundary layer and flow control by periodic addition of momentum , 1997 .

[6]  I. Wygnanski,et al.  Delay of Airfoil Stall by Periodic Excitation , 1996 .

[7]  Michael Amitay,et al.  MODIFICATION OF LIFTING BODY AERODYNAMICS USING SYNTHETIC JET ACTUATORS , 1998 .

[8]  A. Glezer,et al.  The formation and evolution of synthetic jets , 1998 .

[9]  S. G. Mallinson,et al.  Numerical simulation of micro-fabricated zero mass-flux jet actuators , 2003 .

[10]  J. Spurk.  Boundary Layer Theory , 2019, Fluid Mechanics.

[11]  L. N. Jenkins,et al.  FLOW CONTROL DEVICE EVALUATION FOR AN INTERNAL FLOW WITH AN ADVERSE PRESSURE GRADIENT , 2002 .

[12]  Q. P. Ha,et al.  Effectiveness of Synthetic Jets Enhanced by Instability of Tollmien-Schlichting Waves , 2002 .

[13]  Frederick Roos,et al.  Synthetic-jet microblowing for forebody flow-asymmetry management , 1998 .

[14]  M. Gad-el-Hak.  The MEMS Handbook , 2001 .

[15]  R. Mittal,et al.  Interaction of a Synthetic Jet with a Flat Plate Boundary Layer , 2001 .

[16]  Jason S. Kiddy,et al.  Active flow control using microelectromechanical systems , 2000 .

[17]  Dorota Kral,et al.  Active Flow Control Technology , 1999 .

[18]  Chih-Ming Ho,et al.  REVIEW: MEMS and Its Applications for Flow Control , 1996 .

[19]  Mark Sheplak,et al.  Lumped Element Modeling of Piezoelectric-Driven Synthetic Jet Actuators , 2002 .

[20]  Seifert Avi,et al.  Periodic Excitation for Jet Vectoring and Enhanced Spreading , 1999 .

[21]  Xin Zhang,et al.  Co- and contrarotating streamwise vortices in a turbulent boundary layer , 1995 .