Experimental Study of Axial Forcing on a Jet
Open AccessAn experimental jet is created by controlling the axial momentum injection with the resulting water jet discharging into a large tank. The test facility was designed to produce both non-swirling and swirling jets. Axial forcing is implemented for a Reynolds number of 5700 and Strouhal numbers ranging from 0.1 to 0.45 for a round jet. Swirl is initial kept at 0 for data comparison. The forcing amplitude is kept below 20 percent of the axial flow rate, while the azimuthal injection remains unchanged. Swirling jets enhance the mixing of fluids compared to non-swirling jets, which leads to more complete combustion, better chemical process mixing, lower plume temperatures, and reduction in pollutant emissions. This mixing can be improved further by forcing instabilities in the jet. These imposed disturbances are either axial, which generates vortex rings, or angular, which creates more complex structures. Past research involving swirling jets resulted in limited findings due to the concentration of forcing being in either the axial or angular directions, or the experiments were conducted in lower Reynolds number regimes. In this study, axial forcing is implemented and offers insight into the complex flow structures of the jet, as observed in the near and far field of the jet. The flow structures of forced and steady jets are observed using planar laser induced florescence through azimuthal dye injection in the periphery of the jet shear layer, which helps identify flow structures. Dye injection in the jet allows for understanding the effect of forcing on entrainment.
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McCleney_gwu_0075M_11600.pdf | 2018-01-16 | Open Access |
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