جستجوی مقالات مرتبط با کلیدواژه "dentate blocks" در نشریات گروه "فنی و مهندسی"

Many investigations have been performed in order to increase the efficiency of energy dissipation over the spillways. In this study, the chute was roughened by means of the dentate blocks that were made of Teflon with new geometric shape and configurations. The experiments were carried out at three slopes, under six discharges and five dentate blocks configurations. Based on the laboratory results, it was concluded that the roughness geometry influences the relative energy loss. It was also found that using mix arrangements and selecting different sizes among roughness elements can increase the value of relative energy loss. Finally, it was observed that the dentate blocks spillway caused an extra 21% reduction in energy dissipation compared to the stepped spillway which is widely utilized to dissipate the energy.

The generated kinetic energy at the toe of spillways should be dissipated in the shortest basin to provide normal condition downstream of the river. This research aims to introduce the roughened stilling basin by means of roughness elements (dentate blocks) with new geometry form and arrangement. The study also investigates the effect of different parameters of hydraulic jump on this new stilling basin for the Froude numbers in the range of 11 to 14. The experimental results show a reduction of hydraulic jump parameters on dentate blocks stilling basin while compared to the smooth bed. Length of hydraulic jump and sequent depth was reduced by about 50-60% and 10-12%، respectively. Finally the required roughness length and length of hydraulic jump on dentate blocks stilling basin were compared with the smooth bed basin. For dentate block length of basin was 50-60 percent less and the length of hydraulic jump was only 35-40 percent less than the smooth basin.