Turbulent jets in crossflow

National Science Foundation          Graduate Student: Suman Muppidi

 

                  

The term, 'jet in cross-flow' refers to a jet of fluid that exits an orifice to interact with the surrounding fluid that is flowing across the orifice. Jets in cross-flow are central to a variety of applications such as dilution holes in gas-turbine combustors, fuel injectors, and pollutant dispersion from smoke stacks. In gas-turbine combustors, jets of air issue from the dilution holes, and mix with the cross-flow inside the combustor. These dilution jets cool the combustor liners, combustion products, and reduce pollutant formation. Direct numerical simulation is being used to study the process by which the jet mixes with the cross-flow. Deficiencies in presently used scaling laws for jet trajectory have been identified, and a new scaling law has been proposed. Also, direct numerical simulation has been performed under identical conditions as experiment. The simulation results have been used to identify the dominant entrainment mechanisms by the jet, and to propose a simple model for formation of the counter-rotating vortex pair in these flows. The two figures above show the spanwise velocity in a side-view plane and streamwise velocity in an end-view plane from the simulations.

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