Análise do Campo de Pressões em Ressalto Hidráulico Submergido a Jusante de uma Comporta

Abstract

The hydraulic jump is widely used in energy dissipation downstream from hydraulic works. It is a dissipation process associated with velocity, water level and pressure fluctuations. Due to the damage caused to energy dissipation structures over the years by problems related to stress, cavitation and resonance, it is now important to understand the role of the hydraulic jump as a form of dissipation. The characterization of the pressure fields in the bottom of stilling basins is of practical use to the designers of hydraulic works seeking more efficient and economical sizing. There is a large bibliography on free hydraulic jumps, however, little has been written about the most common situation in stilling basins, the submerged hydraulic jump. This article analyses the pressure field in a submerged hydraulic jump downstream from a sluice gate in order to help understand the energy dissipation process and the design optimization of stilling basins. Through the use of non-dimensional parameters it was possible to evaluate and quantify the effects attributed to the submergence on the longitudinal distribution of average pressure, standard deviation, skewness and curtosis coefficients and on the power spectra of the pressure fluctuation