Discussion of “
            <i>Air Entrainment by Spillway Aerators</i>
            ” by Peter Rutschmann and Willi H. Hager (June, 1990, Vol. 116, No. 6)

Pinto, Nelson L. de S.; Neidert, S. H.; Ota, J. J.

doi:10.1061/(asce)0733-9429(1992)118:1(114.2)

Cited by 3 publications

(1 citation statement)

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“…The results presented were obtained in a physical model, however, they are also valid in the prototype scale, safeguarding the maximum geometric limit of 1:15, according to Pinto et al (1982) and Boes & Hager (2003). In this case, Equation 2 and Equation 3 can be used in the spillway design stage, aiming at estimating the mean pressure (P med ), maximum pressure (associated with a 99.9% probability of occurrence, P 99.9% ), minimum pressure (P 0.1% ) and pressure fluctuations (P σ ) to which the prototype would be subjected.…”

Section: /13mentioning

confidence: 71%

Hydrodynamic pressures on a stepped spillway with an aerator system subjected to different air flow rates

Ferla

Novakoski

Castiglio

et al. 2023

RBRH

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Aerator systems promote additional insertion of air into the flow and can reduce the risk of cavitation and consequent damage to hydraulic structures. This work analyzes the hydrodynamic pressures on the steps of a physical model (with a chute inclination of 53.13º) subjected to different aeration conditions. When comparing the results with different air intake coefficients in the flow, it was concluded that the incorporation of air does not change in a generalized way all the statistical parameters associated with hydrodynamic pressures on the steps. However, with the insertion of air in the flow, there was an increase in the minimum pressure values measured in the region of the jet impact and downstream. Empirical equations for predicting the distribution of pressures on the steps under induced aeration conditions were proposed, valid for structures whose ratio between the height of the deflector and the height of the steps is equal to 0.167, with an aerator system installed at the beginning of the stepped chute.

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Section: /13mentioning

confidence: 71%

Hydrodynamic pressures on a stepped spillway with an aerator system subjected to different air flow rates

Ferla

Novakoski

Castiglio

et al. 2023

RBRH

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Air Concentration Distribution Downstream of Spillway Aerators

Afshar

M.Ish

F.Ish

1996

ISH Journal of Hydraulic Engineering

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Laboratory experiments on the distribution of air concentration downstream of spillway aerators have been reported. These data along with those of earlier investigators on different shapes of aerators have been analysed to develop relationships for concentration distribution in terms of geometry and approach flow conditions. The analysis has also been used to evolve an approximate criterion for the spacing of aerators.

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