Ecoulements aérés sur évacuateurs en marches d’escalier équipées de macro-rugosités - Partie I : caractéristiques hydrauliques

André, S; Boillat, Jean-Louis; Schleiss, Anton

doi:10.1051/lhb:2008010

Cited by 9 publications

(2 citation statements)

References 9 publications

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“…Chanson (1994) reported that skimming flow occurs at large discharges. André et al (2003André et al ( , 2004André et al ( , 2005André et al ( , 2006André et al ( , 2008aAndré et al ( , 2008b have conducted several studies on stepped chutes, baffle blocs, energy dissipation and air entrainment subjects. In addition to these, they compared the numerical results with flow characteristics obtained by experimental studies.…”

Section: Introductionmentioning

confidence: 99%

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Determination of flow characteristics of stepped spillways

Dursun

Öztürk

2016

Proceedings of the Institution of Civil Engineers - Water Manag

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Stepped spillways have become a popular method in recent times. Stepped spillways are used commonly for both energy dissipation and aeration. In this study, the energy dissipation ratio and inception point location of stepped spillways with and without end sills were studied using computational fluid dynamic (CFD) methods. The analyses were carried out for two sill types and three s/h ratios. Flow characteristics and air inception points were determined for slope angles of 30°, 40°and 50°. The results were compared and discussed with the other studies in the literature.The greatest energy dissipation ratio was obtained at the slope angle of 30°for type 2A (i.e. stepped sill and s/h ratio of 0·30). Moreover, the greatest energy dissipation ratio was shown at the slope angle of 50°for stepped spillways without end sills. It was found that the length of the non-aerated flow region was closely related to energy dissipation. Finally, the flow characteristics of the stepped spillways can be reliably determined by using CFD analysis.

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Section: Introductionmentioning

confidence: 99%

“…André et al (2004) determined that the length of the nonaerated flow L i is reduced by up to 17% for spaced alternated blocks for the chute at 30°. André et al (2008a) also gave formulae for the length of the non-aerated flow over stepped spillways equipped with end sills on the steps as given below (18·6°< θ < 30°)…”

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confidence: 99%

Determination of flow characteristics of stepped spillways

Dursun

Öztürk

2016

Proceedings of the Institution of Civil Engineers - Water Manag

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Experimental Study of Flows in a Converging Channel Followed by a Prismatic Channel with Stairs

Chetibi

Proust

Benmamar

2018

Advances in Hydroinformatics

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Comparative analyses of phase-detective intrusive probes in high-velocity air–water flows

Felder

Pfister

2017

International Journal of Multiphase Flow

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A comparative analysis of a wide range of air-water flow properties was conducted for two types of phase-detection intrusive probes including fiber-optical and conductivity probes. Experiments were conducted on a stepped spillway model for a skimming flow discharge q = 0.478 m 2 /s and for Re = 4.7 10 5 in a flow region just downstream of the inception point of free-surface aeration and in the fully developed flow region. The comparison of a large number of key air-water flow properties showed a very close agreement for the two sensor types including void fraction, interfacial velocity and equivalent clear water flow depth enabling a direct comparison of past and future data collected with either phase-detection probe type. Minor differences were observed in terms of chord sizes, clustered properties and interparticle arrival times linked with the slightly smaller sensor size of the fiber-optical probe. The in-line positioning of the leading and trailing tips of the fiber-optical probe affected the trailing tip properties resulting in elevated turbulence intensities. An optimum dual-tip phase-detection probe design should consist of small probe tips positioned side-by-side.

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Ecoulements aérés sur évacuateurs en marches d’escalier équipées de macro-rugosités - Partie I : caractéristiques hydrauliques

Cited by 9 publications

References 9 publications

Determination of flow characteristics of stepped spillways

Determination of flow characteristics of stepped spillways

Experimental Study of Flows in a Converging Channel Followed by a Prismatic Channel with Stairs

Comparative analyses of phase-detective intrusive probes in high-velocity air–water flows

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