Experimental investigation on a new method for modifying the geometry of a vertical drop edge equipped with a screen on the amount of energy dissipation

Abstract

The aim of the current research is to investigate the effect of geometry and different angles (180°, 150°, 120° and 90°) of the edge of a vertical drop with a height of 0.15 m with and without a vertical screen on energy dissipation. The finding showed that the triangulation plane forms a vertical drop at different angles of 180°, 150°, 120° and 90° without a screen that increases the energy dissipation of the drop, which is highest at an angle of 90°, by 50.5%. In the vertical drop with a screen, reducing the angle also leads to a decrease in energy dissipation, so the highest energy dissipation occurs at an angle of 180° with a 45.2% increase in energy dissipation compared to the vertical drop without a screen. The relative depth of the edge and the relative depth of the vertical drop pool of the triangular plane are different at the angle vertex and its wings, in such a way that the relative depth of the edge at the vertex is less than the wings and the relative depth of the pool at the vertex is greater than the wings. HIGHLIGHTS This study investigated the hydraulic parameters of a triangular plan forming a vertical drop.; The energy dissipation is different at different angles in the triangular plan forming a vertical drop.; The length of the edge of the triangular plan forms a vertical drop that affects the energy dissipation.; The simultaneous use of the screen affects the hydraulic parameters of the triangular plan that forms a vertical drop.;

Keywords

• energy dissipation
• relative depth of the pool
• screen
• triangular plan form vertical drop