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Experimental analysis of multi-horizontal submerged jets energy dissipater

ABSTRACT The use of a stilling basin with multiple horizontal submerged jets emerging from two layers has been suggested for use as an energy dissipation structure in hydropower stations. In this study, laboratory velocity measurement is performed to analyze the three-dimensional flow structure of submerged jets and to evaluate the effect of the downstream submergence on the flow field. The results indicate that the Reynolds shear stress and vorticity magnitudes increase with increasing jet submergence. Further, it was found that submergence increase leads to a decrease of 2.2% in maximum bed (floor) shear stress and 7.2% in side-walls shear stress. The Reynolds shear stress quadrant decomposition is also performed for all (H = 0) and high magnitude (H = 2) bursting events, which indicate that the turbulence events of outward and inward interactions made dominant contributions to the total Reynolds stress. Turbulent kinetic energy is also analysed to obtain a better characterization of the flow field.