Author(s): S. M. Borghei; A. A. Etminani
Linked Author(s):
Keywords: Plunge pool; Variable pool dimension; Hydrodynamic pressure; Falling jet; Hydraulic model
Abstract: Plunge pool is one of the main structures of dissipating energy in high head dams. Different geometric shapes of them have been designed and are in operation in many parts of the world which are mainly optimized by hydraulic models. Although many experimental results for evaluation of hydrodynamic pressure in this kind of hydraulic structure are available but, the effect of pool width on the hydrodynamic pressures are unknown. This paper examines the effect of pool width using experimental results. The experimental data of more than 130 tests for circular vertical Jet for different diameter, discharge, pool depth and pool width have been analyzed. The result show that by decreasing width, from 10 to 5 times the impact Jet diameter, the hydrodynamic pressures on bed does not change much while, the pressure on the walls shows reduction. In fact due to large circulation of water due to impact jet and the existence of wall jet, negative pressure occurs. The negative pressure also happens at the point where the impact jet in the pool changes direction and becomes a wall jet.
Year: 2001