PSI - Issue 72

Emre Kara / Procedia Structural Integrity 72 (2025) 77–84

78

L 0 Full stroke length OFM Overall Figure of Merit Re Reynolds number Re τ

Frictional Reynolds number

S

Stokes number Strouhal number

St

T Thrust U theo

Theoretical velocity Frictional velocity Characteristic velocity

U τ V 0 V p

Peak velocity

β 0

Orifice utilization factor Mechanical efficiency

η mech η SJA

SJA efficiency

1. Introduction Synthetic jet actuator (SJA) is an active flow control system that reattaches detached turbulent boundary layers to the wing surface, boosting fuel efficiency. An SJA is a flow controller that manipulates surrounding fluid without altering total mass flow. The Visaton SC 8 N loudspeaker is chosen for this study because of its success in SJA simulations and experimental tests.

Fig. 1. Basic working principle of an SJA generated in ANSYS Fluent (2022): (a) Start of the suction stage, (b) end of the suction and start of the blowing stage, (c) end of the blowing and start of the suction stage, (d) end of the suction and start of the blowing stage.