Efeito de Escala nos Valores de Pressão Média junto ao Fundo em Bacias de Dissipação por Ressalto Hidráulico Submergido

Teixeira, Eder Daniel; Prá, Mauricio Dai; Wiest, Rafael André; Marques, Marcelo Giulian

doi:10.21168/rbrh.v17n2.p87-100

Cited by 6 publications

(52 citation statements)

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“…To analyze the effect of possible errors of measurement of extreme pressures commonly adopted in projects (P 0.1% and P 99.9% ), due to the uncertainties in the position of the transducer in the steps, experimental data of pressure measured with transducers by Sanagiotto & Marques (2008) were used in this study. The standard deviation values (σ d ) and statistical probability distribution coefficients N 0.1% and N 99.9% were calculated, respectively, using Equations 11 and 12, following the same methodology used in studies of extreme pressures in hydraulic jumps (Novakoski et al, 2017b;Teixeira, 2008…”

Section: Discussionmentioning

confidence: 99%

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Tassinari

Sanagiotto

Marques

et al. 2020

RBRH

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The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial discretization of data collection. Computational fluid dynamics (CFD) is an important tool for hydrodynamic analysis because, if used properly, it presents great potential for application in hydraulics. In this work, CFD was used to model the skimming flow down a stepped spillway to investigate the effects of possible pressure measurement errors due to uncertainties in the position of the sensors within the steps. The numerical model was validated through literature velocity profiles and pressure experimental data. The results showed that the best values of water fraction (α) to define free surface are α = 0.30 in the nonaerated region and α = 0.10 in the aerated region. Statistical parameters were calculated using experimental data to estimate extreme pressures. These parameters and the simulation results were used to determine that the extreme maximum and minimum pressures occur, respectively, in the region of 0.81 < x/l < 0.98, in the horizontal faces, and in the region of 0.93 < y/h < 0.98, in the vertical faces.

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Section: Discussionmentioning

confidence: 99%

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Tassinari

Sanagiotto

Marques

et al. 2020

RBRH

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“…For the validation of the pressure forecasting methodology proposed by Teixeira (2003) for the low Froude number application, a two-dimensional model of the discharge system of Santo Antônio HPP was built in order to collect instantaneous sample pressure data. This model was built in the Laboratório de Hidráulica Experimental e Recursos Hídricos (LAHE) of ELETROBRÁS-FURNAS (LAHE/FURNAS) in Brazil.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, this paper aims to validate the extreme pressure forecasting method provided by Teixeira (2003) on its application for low Froude number situations.…”

Section: /10mentioning

confidence: 99%

“…There is a great number of studies defining the external characteristics of the jump, such as the ones conducted by Rajaratnam (1967) and Elevatorski (1959). Teixeira (2003) and Trierweiler (2006) present a list of different equations derived for the determination of the sequent depth ratio. The most used, however, is the one established by Bélanger (1828), expressed as Equation 1:…”

Section: Introductionmentioning

confidence: 99%

“…Wang & Chanson (2015) Fewer studies have been published about the forecasting of pressure distribution of the hydraulic jump, especially based on physical modelling, although they are of great importance for the design criteria of flow discharge systems. Teixeira (2003) developed a methodology for the estimation of extreme pressures acting on stilling basins. Data from models and prototype were used in the derivation of the proposed equations, which was based on the dimensionless equations proposed by Drapeau et al (1997).…”

Section: Introductionmentioning

confidence: 99%

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Extreme pressure forecasting methodology for the hydraulic jump downstream of a low head spillway

Hampe

Júnior

Prá

et al. 2020

RBRH

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Extreme pressures in the hydraulic jump are associated with risk of damage to the flow discharge system of dams by a series of mechanisms. Therefore, understanding and predicting these efforts are crucial for the safe and economical design of discharge systems. Thus, this paper aims to validate an existing pressure forecasting methodology for estimating the extreme pressure in the hydraulic jump with low Froude number (below 4.5). Results have shown that the method may be used for this situation on a preliminary basis. Further studies are recommended to refine the technique and to achieve results that are more precise.

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Start position of a sloping hydraulic jump

Wiest¹,

Júnior

Teixeira

et al. 2020

RBRH

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Although sloping hydraulic jumps are frequent in energy dissipators, there are few studies regarding this type of phenomenon. Since the jump is accompanied by violent impacts and sudden variations of velocity and pressure, it is important to know the region where the phenomenon will occur, in order to make a safe and economic design possible. In this paper, a methodology for the determination of the start position of the sloping jump along a Creager spillway is introduced. It was verified that this position is a function of both the incident Froude number and the submergence factor.

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Efeito de Escala nos Valores de Pressão Média junto ao Fundo em Bacias de Dissipação por Ressalto Hidráulico Submergido

Cited by 6 publications

References 0 publications

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Extreme pressure forecasting methodology for the hydraulic jump downstream of a low head spillway

Start position of a sloping hydraulic jump

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