Experimental and computational study of fluid flow on a flat plate with three rectangular impinging slot jets

Computational and experimental studies on a flat plate are carried out to investigate flow characteristics with an array of three rectangular air jets impinging on its top surface. Pressure distribution on the impingement surface and flow visualization experiments with oil lamp black technique are carried out to qualitatively corroborate the computational flow structure with visualized patterns. Computations are carried out by shear stress transport (SST) kappa-omega turbulence model. The jet-to-plate spacing (H) to hydraulic diameter of slot (D) ratio (H/D) is varied from 0.5 to 4.0 and jet Reynolds number (Re) is varied from 5282 to 8450. The computationally obtained flow structure reveals the complex interaction of the wall jets. Primary pressure peaks are observed at the stagnation point and the secondary peaks are noticed at the interaction points of the wall jets. Position of the secondary peaks depends upon H/D and is independent of Reynolds number.