Abstract
A Mach 0.9 axisymmetric jet is calculated by large-eddy simulation (LES) to investigate the effects of localized arc filament plasma actuators (LAFPAs), which show control authority in flow control. The LAFPA is modeled as a heat flux band on nozzle wall. The heat flux for each band (actuator) is calculated based on the experimental data. The LES results show that the heat flux band actuators well represent LAFPAs in the literature. The forced jet is simulated at three forcing azimuthal modes (mF) of 0, 1, and ±1 and at forcing Strouhal number of 0.22 or 0.26, near the jet column instability Strouhal number, which is optimal forcing Strouhal number for enhanced mixing, as generally agreed. The effects of forcing azimuthal modes are very similar to those found in experimental results available in the literature. The LES results show the three-dimensional nature of generated large, coherent structures. For mF = 0 and 1, the generated structures are vortex rings and helixes, respectively, as can be expected from twodimensional PIV results. However, the generated structure at mF = ±1 is three-dimensional, while it was expected to be quasi-two-dimensional based on 2D-PIV results. Three-dimensional aspect of the generated coherent structures shows more clearly the role of the structures in jet development especially for mF = ±1, which shows best jet spreading.
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