Efficiency Evaluation of Hammer & Hytran Software and Joukowski Equation Solution in Analysis of Water Hammer at Hasanlu Dam Pumping Station

One of the hydraulic flow types in pipes is transient flow، which is specifically called water hammer. Transient flows start from a steady state and end to another steady flow. Several calculation methods introduced to study water hammer phenomenon، and have been used since 1950. One of the applied methods is Joukowski equation، which has been selected as the manual solution in this study. Because of ignorance of momentum in most of the pipeline design software such as WaterCad and WaterGems، they can not calculate unsteady flow. So it is important to launch specific software to calculate unsteady flow especially water hammer. In fact Hammer and Hytran software are numerical simulations of hydraulic phenomenon of water hammer in conduits of water، sewage and industrial sewage. In this study the ability of these software are compared with Joukowski equation solution method. For this purpose maximum pressure of water hammer in pump at sudden shut-off condition with no control equipment is studied using Hammer & Hytran software and Joukowski equation. Results show an overestimated water hammer pressure in Joukowski equation solution. Hytran and Hammer software calculate the surge pressure rate 23% and 32% less than Joukowski equation، respectively.