COANDA SURFACE EFFECT ON THE SWEEPING JET ACTUATOR

Abstract

A sweeping jet (SWJ) actuator emits a continuous but spatially oscillating jet when pressurized with a fluid. In this study, unsteady flow fields generated by an SWJ actuator are investigated using two-dimensional, unsteady, Reynolds-Averaged Navier Stokes (2D-URANS) simulations with Ansys v17 Fluent software over a nine different Coanda Surfaces. As a turbulence model, the SST kcharacteristic point, oscillating jet velocity magnitude is sampled, and a Fast Fourier Transform (FFT) performed for several SWJ models. The jet oscillation frequency of the baseline case was compared with experimental and other numerical studies in the literature, and an excellent agreement was found. Using the validated simulation model, several modified Coanda Surfaces were studied. The effect of different Coanda surface, as well as mass flow rate on the jet velocity profile, is presented. Additionally, the static and total pressure is analyzed to determine the pressure drop of each modified SWJ actuator