Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and surfaces, the effects include decreased lift, increased drag, enhanced unsteadiness noise, all which are detrimental to flight performance, fuel consumption, environmental emissions. Many types actuators have been designed in past counter negative separation, from passive vortex generators active methods like synthetic jets, plasma actuators, or sweeping jets. At Chair Aerodynamics at TU Berlin, significant success has achieved through use pulsed jet (PJA) operate by ejecting given amount fluid specified frequency slit-shape slot test surface, thereby increasing entrainment momentum separating boundary layer thus delaying separation. Earlier PJAs were implemented using fast-switching solenoid valves regulate amplitude frequency. In recent years, mechanical replaced fluidic oscillators (FO) an attempt generate desired authority without any moving parts, paving way industrial applications. present article, we in-depth design analysis affect operation such FO-based PJAs. We start reviewing current knowledge mechanism with before embarking detailed single-stage particular, show that there is regime where oscillation mainly driven feedback loop length. Additionally, higher-order regimes significantly increased. parameters influence different discussed strategy incorporate this new into proposed.