Hydrodynamics of a turbulent slot jet flow impinging on a concave surface

This study investigates hydrodynamic characteristics of a slot jet flow impinging on a concave surface experimentally and numerically. Six different concave plates with varying surface curvature and a flat plate are used. Air is used as the impinging coolant. In the experimental work, the slot nozzle used was specially designed with a sixth degree polynomial in order to provide a uniform velocity profile at its exit. The experiments were carried out for the jet Reynolds numbers in the range of 3000<Re<12500, the dimensionless nozzle-to-surface distance range of 1 <= H/W <= 14 for dimensionless value of the curvature of impinging surfaces in the range of R/L=0.5, 0.5125, 0.566, 0.725, and 1.3. The pressure coefficient, C-p, for each test case was obtained across dimensionless arc length, s/W. Numerical computations were performed by using the k-epsilon turbulence model with enhanced wall functions for the concave plate with R/L=0.725 and for the flat plate. The numerical results showed a reasonable agreement with the experimental data. (C) 2012 Elsevier Ltd. All rights reserved.