TY - JOUR

T1 - Solution for spillway chute aeration through bottom aerators

AU - Fuhrhop, H.

AU - Schulz, Harry Edmar

AU - Wittenberg, Hartmut

N1 - Funding Information: ACKNOWLEDGEMENTS The second author thanks Prof. Fazal Hussain Chaudhry for his support to this research line at EESC/USP, and the Brazilian research support institutions CNPq, CAPES, and FAPESP. Publisher Copyright: © 2014 WIT Press

PY - 2014/9/30

Y1 - 2014/9/30

N2 - Cavitation is a heavy threat for spillways with concrete chutes. Besides a proper design and execution, aeration is an effective means to avoid severe damages. A detailed study on bottom aerators of spillway chutes is presented here. Data from laboratory experiments were used to calibrate the coefficients of a physically based equation, which considers the effects of aerator geometry and different roughnesses of the surface of the aerator. After adjustment of scale factors, results computed by this equation showed a good agreement with observed data of different prototypes found in the literature. The main physical concepts of the developed equation are presented. The quantification of the air flow into the water jet was performed by separately considering the gas and liquid phases and using the subpressure under the jet of the aerator as a liaison between the two formulations. Consequently, this subpressure does not appear explicitly in the final formulation and does not need to be known for the quantification of the gas flow. The results show that the approach is suitable for the given problem.

AB - Cavitation is a heavy threat for spillways with concrete chutes. Besides a proper design and execution, aeration is an effective means to avoid severe damages. A detailed study on bottom aerators of spillway chutes is presented here. Data from laboratory experiments were used to calibrate the coefficients of a physically based equation, which considers the effects of aerator geometry and different roughnesses of the surface of the aerator. After adjustment of scale factors, results computed by this equation showed a good agreement with observed data of different prototypes found in the literature. The main physical concepts of the developed equation are presented. The quantification of the air flow into the water jet was performed by separately considering the gas and liquid phases and using the subpressure under the jet of the aerator as a liaison between the two formulations. Consequently, this subpressure does not appear explicitly in the final formulation and does not need to be known for the quantification of the gas flow. The results show that the approach is suitable for the given problem.

KW - Aeration of channel flows

KW - Bottom aerators

KW - Designs of spillways

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85054761009&partnerID=8YFLogxK

U2 - 10.2495/CMEM-V2-N3-298-312

DO - 10.2495/CMEM-V2-N3-298-312

M3 - Journal articles

AN - SCOPUS:85054761009

VL - 2

SP - 298

EP - 312

JO - International Journal of Computational Methods and Experimental Measurements

JF - International Journal of Computational Methods and Experimental Measurements

SN - 2046-0546

IS - 3

ER -