![]() Three-dimensional flow was a key part of efficient mixing and was observed for all configurations. The mass-flow ratios and orifices investigated were often very large (mass-flow ratio >1 and ratio of orifice area-to-mainstream cross-sectional area up to 0.5), and the axial planes of interest were sometimes near the orifice trailing edge. In the cylindrical geometry, planar variances are very sensitive to events in the nearwall region, so planar averages must be considered in context with the distributions. It also appeared that jet penetration remained similar with variations in orifice size, shape, spacing, and momentum-flux ratio when the number of orifices was proportional to the square-root of the momentum-flux ratio. let penetration was critical, and jet penetration decreased as either the number of orifices increased or the momentum-flux ratio decreased. The principal observations were that the momentum-flux ratio and the number of orifices were significant variables. ![]() The studies from which these results were excerpted investigated flow and geometric variations typical of the complex 3-D flowfield in the combustion chambers in gas turbine engines. This paper summarizes NASA-supported experimental and computational results on the mixing of a row of jets with a contract subsonic crossflow in a cylindrical duct.
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