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Unsteady flow simulations for synthetic jets in quiescent air
Jaeik Ko,Jihyeon Park,최민석 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Unsteady flow simulations were conducted to investigate the flow generated by a synthetic jet actuator in quiescent air. The predicted synthetic jets by 2D axisymmetric and 3D simulations were compared to each other and experimental data to check their accuracy. It was found that the 2D axisymmetric simulations were as accurate as the 3D simulations to predict synthetic jets in quiescent air. Thereafter, three different membrane profiles, namely a simple trigonometric model, a distributed load model and a concentrated load model, have been tested to determine which one is most appropriate to describe the motion of a piezoelectric disc, which was attached to a cavity and was oscillated to generate synthetic jets, using 2D axisymmetric unsteady simulations. Finally, a critical value of Mach number was found in this work for considering the compressibility of air based on the numerical simulations for synthetic jets.