scholarly journals Experimental Study of Delay of Separation on a NACA 0015 Wing Model Using Synthetic Jet Actuators

2014 ◽  
Author(s):  
Alan M L'Esperance
Keyword(s):  
Experimental Study ◽  
Synthetic Jet ◽  
Synthetic Jet Actuators ◽  
Wing Model ◽  
Jet Actuators ◽  
Naca 0015

Experimental Study of the Dynamics of Synthetic Jet Actuators With Different Orifice Sizes

2005 ◽  
Author(s):  
Rahul Sekhri ◽  
Marco P. Schoen ◽  
Feng Lin ◽  
Brian G. Williams
Keyword(s):  
Experimental Study ◽  
Sound Pressure ◽  
Closed Loop ◽  
Solid Wall ◽  
Mechanical Vibration ◽  
Synthetic Jet ◽  
Control Laws ◽  
Synthetic Jet Actuators ◽  
Jet Actuators ◽  
Active Flow

Synthetic jet actuators (SJA) are one of the newly developed actuators that have demonstrated its great potentials in active flow applications, particularly in closed-loop flow controls. The SJA contains a piezoelectric membrane in a cavity, which vibrates and generates a periodic jet at the exit of the cavity through an orifice that is mounted flush with the solid wall of the flow field. In order to design the feedback control laws, it is crucial to be able to quantitatively capture the dynamics of SJA. In this paper, the dynamics of SJAs with six different orifice sizes are experimentally investigated. A synthesis using system identification for the purpose of constructing mathematical models of these zero mass-flux actuators is offered. The experimental study includes two output parameters, the acoustic sound pressure generated by the SJA and the mechanical membrane vibration of the SJA. State-space models for these outputs (sound pressure and mechanical vibration) are developed as a function of orifice size. These results form a foundation for future intelligent design of SJA.

Experimental Study on the Use of Synthetic Jet Actuators for Lift Control

2016 ◽  
Author(s):  
Ricardo B. Torres ◽  
Gustaaf B. Jacobs ◽  
Michael J. Cave
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Shear Layer ◽  
Synthetic Jet ◽  
Inlet Guide Vane ◽  
Trailing Edge ◽  
Synthetic Jet Actuator ◽  
Synthetic Jet Actuators ◽  
Jet Actuators ◽  
Lift Control

An experimental study on the use of synthetic jet actuators for lift control on a generic compressor airfoil is conducted. A wind tunnel model of a NACA 65(2)-415 airfoil, representative of the cross section of an Inlet Guide Vane (IGV) in an industrial gas compressor, is 3D-printed. Nine synthetic jet actuators are integrated within a planar wing section with their slots covering 61% of pressure side of the airfoil span, located 13% chord upstream of the trailing edge. The Helmholtz frequency of the slot is matched closely with the piezoelectric element material frequency. The slot is designed so that the bi-morph actuation creates a jet normal to the airfoil surface. By redirecting or vectoring the shear layer at the trailing edge, the synthetic jet actuator increases lift and decreases drag on the airfoil without a mechanical device or flap. Tests are performed at multiple Reynolds number ranging from Re=150,000 to Re=450,000. The increased lift of the integrated synthetic jet actuator is dependent on the Reynolds number and free stream velocity, the actuation frequency, and angle of attack. For actuation at 1450 Hz the synthetic jet actuator increases lift up to 7%. The synthetic jet increases L/D up to 15%. Velocity contours obtained through PIV show that the synthetic jet turns the trailing edge shear layer similar to a Gurney flap.

Towards the Design of Synthetic-jet Actuators for Full-scale Flight Conditions

2007 ◽  
Vol 78 (3-4) ◽  
pp. 283-307 ◽  
Author(s):  
Shan Zhong ◽  
Mark Jabbal ◽  
Hui Tang ◽  
Luis Garcillan ◽  
Fushui Guo ◽  
...  
Keyword(s):  
Synthetic Jet ◽  
Full Scale ◽  
Synthetic Jet Actuators ◽  
Jet Actuators
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