Numerical investigation of air-entrainment in skimming flow over stepped spillways

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Air Entrainment and Pressure Development in Skimming Flow on an Abrupt Slope Change on Stepped Spillways

Numerous stepped spillways were built to date, namely on RCC gravity dams or on valley flanks besides embankment or rockfill dams, while some others are currently under design or construction. In some cases, slope changes may be required on stepped chutes, due to the topography, leading to reduced excavation and related economic benefits. A quite limited number of stepped spillways have been bu...

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Experimental Study of Turbulence Manipulation in Stepped Spillways. Implications on Flow Resistance in Skimming Flows

Current expertise in air-water turbulent flows on stepped chutes is limited to laboratory experiments at low to moderate Reynolds numbers on flat horizontal steps. In this study, highly turbulent air-water flows skimming down a large-size stepped chute were systematically investigated with a 22o slope. Turbulence manipulation was conducted using vanes or longitudinal ribs to enhance interaction...

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survey the effect of downstream crest chute slope on the natural air entrainment point in skimming flow in stepped spillway

abstract stepped spillways are of most important hydraulic constructions to dissipation energy of water flow. these constructions are used in opening channel to transfer water from upper level to lower level. because of considerable effect of steps on flow dissipation energy and also the resulted developments in construction of roller competed concrete rcc, the mentioned constructions have draw...

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Energy dissipation and air entrainment on stepped spillways with non-uniform cavity sizes

An experimental study was conducted on a large size stepped spillway model with a moderate slope (26.6o) for a range of discharges between 0.020 and 0.237 m/s. In some experiments, the stepped chute was equipped with uniform steps of 5 and 10 cm heights respectively. In addition several non-uniform configurations with combinations of 5 and 10 cm high steps were investigated. For each configurat...

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ژورنال

عنوان ژورنال: Theoretical and Applied Mechanics Letters

سال: 2016

ISSN: 2095-0349

DOI: 10.1016/j.taml.2016.03.003