Experimental study on pressure and aeration characteristics in stepped chute flows

Xu, Weilin; Luo, Shu-jing; Zheng, Qiu-wen; Luo, Jianbin

doi:10.1007/s11431-015-5783-6

Cited by 21 publications

(12 citation statements)

References 15 publications

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“…Extensive studies were developed aiming to study flow behavior and pressure heads on stepped spillways (e.g. Chanson, 1994;Sánchez-Juny et al, 2008;Zhang et al, 2012;Xu et al, 2015;Parsaire et al, 2016;Zindovic et al, 2016;Zhang & Chanson, 2017. However, according to specific studies, implementation of stepped spillways is limited to a restricted range of specific discharge, in order to avoid cavitation damage, that may take on values from 10 to 17 m 3 /s/m (Gomes (2006), Amador et al (2009) and Novakoski et al (2018) up to 20 to 30 m 3 /(sm) (Matos et al, 2001;Boes & Hager, 2003).…”

Section: Introductionmentioning

confidence: 99%

Stepped spillway with pre-aeration by a deflector: flow characteristics

Novakoski

Ferla

Prá

et al. 2020

RBRH

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ABSTRACT Stepped spillways aim to dissipate part of the upstream energy during the flow passage by the chute. However, the use of these structures is limited to a restrict range of specific discharges due to the risk of cavitation damage. As the air entrainment into the flow assists the concrete protection against the aforementioned damages, a possible solution by aerators installed along the chute, already disseminated to smooth chutes, is being studied to be used also in stepped spillways. The purpose of the present paper is to characterize a flow over a stepped chute with induced aeration by deflector and air supply by an airtight chamber trough tests conducted on a reduced scale physical model. The main regions observed during the tests are presented and were developed four equations that allow to approximately predict the location of the main regions for a given spillway.

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Section: Introductionmentioning

confidence: 99%

Stepped spillway with pre-aeration by a deflector: flow characteristics

Novakoski

Ferla

Prá

et al. 2020

RBRH

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“…water 0 air 0 < ζ < 1 free surface (8) The two-phase flow is considered a mixed fluid. Therefore, the density and the dynamic viscosity are expressed as (10) in which subscripts 1 and 2 represent the two fluids [31], and the volume-fraction function is predicted by solving an advection equation:…”

Section: Methodsmentioning

confidence: 99%

“…In Ref. [10], a study on pressure and aeration in stepped-chute flows was conducted. It was suggested that an 2 of 14 aerator should be employed at the end of the step surface in order to avoid cavitation.…”

Section: Introductionmentioning

confidence: 99%

Flow Pressure Behavior Downstream of Ski Jumps

Lauria

Alfonsi

Tafarojnoruz

2020

Fluids

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Ski jump spillways are frequently implemented to dissipate energy from high-speed flows. The general feature of this structure is to transform the spillway flow into a free jet up to a location where the impact of the jet creates a plunge pool, representing an area for potential erosion phenomena. In the present investigation, several tests with different ski jump bucket angles are executed numerically by means of the OpenFOAM® digital library, taking advantage of the Reynolds-averaged Navier–Stokes equations (RANS) approach. The results are compared to those obtained experimentally by other authors as related to the jet length and shape, obtaining physical insights into the jet characteristics. Particular attention is given to the maximum pressure head at the tailwater. Simple equations are proposed to predict the maximum dynamic pressure head acting on the tailwater, as dependent upon the Froude number, and the maximum pressure head on the bucket. Results of this study provide useful suggestions for the design of ski jump spillways in dam construction.

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“…Consequently, a solid surface receives a hole, so-called cavitation pitting. Several cases of cavitation damage in a chute of spillways documented [17,28,29]. The flow pressure and velocity are the main parameters to evaluate the cavitation potential as shown in the following equation [28,30]:…”

Section: Hydraulic Performancementioning

confidence: 99%

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

Faridmehr

Nejad

Baghban

et al. 2020

Water

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Maintaining the reservoir safety of large dams has considerable importance for the public where they are constructed in heavily populated and industrialized areas. The extreme hydrodynamic force caused by ground acceleration, cavitation damage, and vibration are among concerns that threaten the safety of the spillway and its conveyance structures when subjected to a natural disaster, such as earthquakes and severe floods. Current research investigates the hydrostatic and hydrodynamic performance of the Karkheh Dam spillway radial gate through 3-D finite element (FE) models using ABAQUS/Explicit. The common loads applied on the radial gate were reviewed and stress–strain in the skin plate and trunnion were investigated as a result of developed hydrodynamic pressures. The performance of conveyance structures subjected to significant discharge was also investigated through a small-scale model to evaluate the cavitation damage index. The results of this research will help researchers in the field of civil and hydraulic engineering for the risk analysis of the radial gates and conveyance structures.

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Experimental study on pressure and aeration characteristics in stepped chute flows

Cited by 21 publications

References 15 publications

Stepped spillway with pre-aeration by a deflector: flow characteristics

Stepped spillway with pre-aeration by a deflector: flow characteristics

Flow Pressure Behavior Downstream of Ski Jumps

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

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