The Effect of Weight and Position on Energy Dissipation in Multi-pendulum Sill

Abstract

Energy dissipation downstream of hydraulic structures is one issue that engineers involved in hydraulic irrigation design must consider. This paper describes a new technique for increasing energy dissipation and shortening the floor length of a hydraulic design. The pendulum sills were plastic cylinders of 29.5 cm in length, with diameters of 3.75 and 5.00 cm and wall thickness of 5 mm. The sill's position relative to the hydraulic leap was altered by varying the weight and string length. Each diameter's sill weight was modified to six different values. The results showed that using a pendulum sill increased energy dissipation significantly. It was observed that utilizing the weight 1121kg is the best solution since energy dissipation increases by approximately 55% with increasing string length and number of sills.