Influence of spent air confinement on pressure distribution over a flat plate impinged by an array of jets

Abstract

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 t o 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.