Discussion. Theoretical and Experimental Investigation of Air-Regulated Siphons.

Ali, Khm; Elsawy, Em; Pateman, D; Ervine, Da

doi:10.1680/iicep.1980.2192

Cited by 1 publication

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“…The studies and practices intensified in the 1970s and have continued until today. For example, Head (1971), Charlton (1971), Ackers and Thomas (1975), Head (1975), Unser (1975), Ali and Pateman (1980), Ervine and Oliver (1980), Bollrich (1994) conducted various theoretical and experimental studies on the design and performance of siphon spillways. In the recent years, Houichi et al (2006), Yucel (2008), Jourabloo (2010), Ghafourian et al (2011) experimentally studied on the hydraulic performance of the siphon spillways.…”

Section: Introductionmentioning

confidence: 99%

Aeration performance of high-head siphon-shaft spillways by CFD models

Aydın

Ulu

2021

Appl Water Sci

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Siphon-shaft spillways are constituted by covering above a shaft spillway with a hood that creates siphonic pressure. This study focused on the aeration the flow through the aerator holes placed on the hood to prevent cavitational damage in high-head siphon-shaft spillways. Three-dimensional computational fluid dynamics (CFD) technique using finite-volume method to solve Reynolds-averaged Navier–Stokes (RANS) equations for the incompressible viscous and turbulent fluids motion was performed to analyze the full-scaled two-phase numerical models. The volume of fluid (VOF) scheme was used to simulate two-phase (water–air) flow, by defining the volume fraction for each of the fluids throughout the solution domain. The accuracy of the numerical model was tested using a procedure recommended by American Society of Mechanical Engineers (ASME) for CFD applications. The numerical results showed that the aeration is highly effective in reducing siphon sub-pressures and cavitation. The optimal relative aeration diameter of 0.45 provided sufficient air entrainment to protect from cavitation and did not decrease the discharge performance too much.

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