This study investigates the factors affecting low momentum jets that are injected at an angle relative to a crossflow stream, which is relevant to various film-cooling technologies. Quantitative measurements of the jet fluid concentration were obtained based on planar laser induced fluorescence (PLIF) from acetone vapor that was seeded into the jet. The jets were injected at five different axial locations downstream of the leading edge of a flat plate, resulting in different boundary layer thicknesses at the injection location. At each location, the jet-to-crossflow momentum flux ratio (J) was varied from 0.5-5. The jet centerline trajectories were affected not only by the momentum flux ratios, but also by the approaching crossflow boundary layer thickness. The jet trajectories were completely inside the crossflow boundary layer for J\<1, with the jet curling back in towards the flat plate as it moves downstream for most injection locations. At higher momentum flux ratios, the behavior of the jet varied strongly depending on whether the trajectory penetrated through the boundary layer thickness. Contrary to the existing literature, the jet penetrated less for thicker crossflow boundary layers. Furthermore, scaling arguments for the jet trajectories and mixing characteristics based on jet concentration profiles also are presented.


Penetration and Mixing Characteristics of Inclined Jets in Crossflow at Low Momentum Flux Ratios

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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