Experiments and Numerical Simulation of Synthetic Jets Issuing from an Oscillating Nozzle

In this study, a synthetic jet actuator (SJA) with a flexible and time-variable nozzle is investigated using joint experimental and numerical approaches. The experiments follow the recently published results (Travnicek & Antošová, Int. J. Thermal Sciences, 2020, doi.org/10.1016/j.ijthermalsci.2020.106349). The novel numerical approach is based on the computational model for the variable nozzle composite jet actuator which was establish using Large Eddy Simulation (LES) to capture unsteady vortex structures within the flow field. The study successfully reproduced the motion characteristics of the dual-independent- drive system. Simulation results demonstrate the influence of nozzle cross-sectional area variation on jet formation. This numerical model serves as a foundational tool for subsequent investigations into the effects of phase difference and optimization of impact heat transfer mechanisms.