Experimental study on time-averaged pressures in stepped spillway / Jianmin Zhang in Journal of hydraulic research, Vol. 50 N° 2 (Mars/Avril 2012)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 236-240 Titre : Experimental study on time-averaged pressures in stepped spillway Type de document : texte imprimé Auteurs : Jianmin Zhang, Auteur ; Jiangang Chen, Auteur ; Yurong Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 236-240 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Experimentation Flow pattern Non-aerated flow Pressure characteristic Stepped spillway Résumé : Steps located in the non-aerated flow region of a chute are prone to cavitation damage. Two models operated with various Froude numbers and bottom slopes were employed to measure the pressure on the steps. The minimum and maximum pressures on the horizontal step surfaces occurred at the chute beginning and at the chute end, respectively. These characteristics were also found in the fully-developed flow region. The time-averaged pressure on the horizontal step surfaces is negative at the chute start, and then becomes positive along the flow direction in the non-uniform flow region. On the vertical step surfaces, the pressure is always negative at the top and remains negative along the entire vertical surface if the unit discharges are high enough in the non-uniform flow region. These results differ from the pressure characteristics in the uniform aerated flow region. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.666879 [article] Experimental study on time-averaged pressures in stepped spillway [texte imprimé] / Jianmin Zhang, Auteur ; Jiangang Chen, Auteur ; Yurong Wang, Auteur . - 2012 . - pp. 236-240. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 236-240 Mots-clés : Experimentation Flow pattern Non-aerated flow Pressure characteristic Stepped spillway Résumé : Steps located in the non-aerated flow region of a chute are prone to cavitation damage. Two models operated with various Froude numbers and bottom slopes were employed to measure the pressure on the steps. The minimum and maximum pressures on the horizontal step surfaces occurred at the chute beginning and at the chute end, respectively. These characteristics were also found in the fully-developed flow region. The time-averaged pressure on the horizontal step surfaces is negative at the chute start, and then becomes positive along the flow direction in the non-uniform flow region. On the vertical step surfaces, the pressure is always negative at the top and remains negative along the entire vertical surface if the unit discharges are high enough in the non-uniform flow region. These results differ from the pressure characteristics in the uniform aerated flow region. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.666879

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