The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

Abstract

Stilling basins can be defined as energy dissipaters constructed of the irrigation systems. This study aims at investigating the performance of the new seven baffle blocks design in terms of reducing the dimensions of stilling basins in irrigation systems. In order to assess the hydraulic efficiency of a new model for baffle block used in stilling basins, a Naval Research Laboratory (NRL) has conducted. The results of this study demonstrate that the performance of the new baffle block, in term of hydraulic jump length reduction and hydraulic energy dissipation, it's better than standard blocks. However, the ratios of the drag resistance attributed to the new baffles block (FB / F2) have been larger than that applied on the normal block. It was found that the new block dissipates the energy by 9.31% more than the concrete block, and decreases the length of the hydraulic jump by 38.6% in comparison with the standard blocks. However, the new block maximizes the drag force ratio by 98.6% in comparison with the standard baffle blocks. The findings indicated that in terms of energy reduction and dissipation in the length of the hydraulic jump, the new block is superior to the other kinds.

Effect of Various Kinds of Stilling Basin’s Baffle Blocks Arrangement on River Bed Scour

“…Several variables are used in studies of scour depth in the riverbed [4,11,16,20,21]. The scour depth depends on a large number of flow and basin variables (geometric, kinematic, and dynamic variables) as follows.…”

“…According to the results of the study, the semi-circular and trapezoidal baffle blocks have provided the best results [15]. Al-Mansori et al [16] The authors presented only the results of their study on Energy Dissipation of the geometric properties of baffle blocks [16]. Alternatively, Elsaeed et al [17] studied experimentally the effect of the water jet designed for the drop bearing on scour, and recommended designs that caused less scour to be used [17].…”

The Experimental Investigation of the Optimization of the Flow State of a Ladder-Shaped Spillway in a Certain Reservoir

“…e occurrence of slip flow is regarded as the design criterion of ladder-shaped spillways. Drop flow often occurs under small flux conditions [11][12][13], and the transitional flow should be avoided. To date, a great number of experimental investigations on the energy dissipation characteristics of slip flow of the ladder-shaped spillways have been performed [14], but due to the complexity of water movement, unanimous conclusions have not been obtained [10,15].…”

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

“…e addition of these gates adds some new complex issues to the hydraulic subjects [6,7]. Al-Mansori et al [8] found that, with increasing hydraulic head, up to seven times that of the design head, the flow separation zone grows linearly. Discharge coefficients are studied for a wide range of head ratios.…”