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Experimental investigation reveals maximum cross-flow interference under single-sided spent air exit in impinging jet arrays, highlighting the impact of confinement geometry on surface pressure.
The paper deals with an experimental study carried out to determine the effect of spent air confinement on the wall-static pressure distribution (Cp) over a flat plate normal to a single row of impinging air jets. The jet after impingement is constrained to exit from one side, two opposite sides and all sides. The parameters used in the study are jet Reynolds number (Re = 10000), dimensionless nozzle-exit to target-plate spacing (z/d = 1, 2, and 3), stream-wise jet-to-jet spacing (s/d = 2 and 4), and dimensionless length of the jets (l/d = 1.0). The flat target plate is mounted on a 2D traverse table which also facilitates setting up the nozzle-exit to target-plate spacing. The pressure distribution is measured in the stream-wise direction by using a single column manometer. The cross-flow effect is found to be maximum when the spent jet is free to exit from one side only.
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Patil et al. (2020) studied this question.
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