Analysis of water hammer in a penstock in the case of valve closure. Part 2: Pressure losses concentrated downstream

Abstract

In our previous study (Part 1); by using the graphic of Bergeron, we have drawn the relationships which allow calculating flows and pressures at the valve and the reservoir, considering that pressure losses are negligible. Now, we assume in this second contribution that these pressure losses are concentrated downstream of the pipe, just at the entry of the valve. The study will focus on water hammer-induced by a slow closing of the valve. A practical example will be presented at the end of this work in order to illustrate the exposed method.

Keywords

• Coup de bélier, Pertes de charges, Fermeture de vanne, Diagramme de Bergeron