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- W2325063681 abstract "Simulations have been performed on a Mach 1.3 jet subjected to excitation by a set of eight Localized Arc Filament Plasma Actuators (LAFPAs) mounted on the periphery of the nozzle exit. Several different modes are considered, including axisymmetric (m=0), helical (m =0 , m =1 , m =2 and m =3 ) and mixed (m = ±1 and m = ±2). The effect of different excitation frequencies is explored, as characterized by the Strouhal number, St, based on the jet velocity and nozzle exit diameter. In the first part of this paper, the generation, evolution and breakdown of coherent structures, which are most prominent at the lower Strouhal number, are reviewed. Hairpin vortices are observed to be key building blocks in the evolution process, and are observed in instantaneous as well as phase-averaged realizations. The phase-averaged structure shows a variety of features, including rolls and ribs (m =0 ), single-helix (m =1 ), double-helix (m =2 ), and interacting vortex loops (m = ±1 and m = ±2). In the second part of the paper, the near field is analyzed under the influence of m =0 and m =1 excitation at St =0 .3, 1.0 and 2.0. The analysis, which includes azimuthal mode decomposition of the pressure field, shows that at higher frequencies, the large structure formation is inhibited and peak SPL amplitudes diminish, in a manner that is generally consistent with experimental results." @default.
- W2325063681 created "2016-06-24" @default.
- W2325063681 creator A5082589597 @default.
- W2325063681 date "2011-01-04" @default.
- W2325063681 modified "2023-09-28" @default.
- W2325063681 title "Simulation-Based Analysis of the Near Field in a Supersonic Jet Controlled by Plasma Actuators" @default.
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- W2325063681 doi "https://doi.org/10.2514/6.2011-23" @default.
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