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iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Engineering > Department of Civil, Architectural,and Environmental Engineering > Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405] > Fluid flow conditions in asymmetrical nozzle in discharge pipe system of reversible pump-turbine

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1393

Title: Fluid flow conditions in asymmetrical nozzle in discharge pipe system of reversible pump-turbine
Authors: Predin, Andrej
Klasinc, Roman
Bilus, Ignacijo
Kastrevc, Mitja
Keywords: Modeling of confined flows;Computational hydraulics
Issue Date: 13-Sep-2006
Publisher: Michael Piasecki and College of Engineering, Drexel University
Citation: Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
Abstract: Modern reversible hydro energetic systems are expected to have short operating regimes (pump – turbine) switching time. It is known, one the one side, that profit of reversible systems increases with rise of difference between buying and selling price of the produced electrical energy. When we reduce switching time, on the other side, the physical limitations connected with water hammer effect and pressure pulsations caused with flow inertia have to be considered. These limitations could lead to material erosion and to material damage. Use of the asymmetrical nozzle that is the simple but effective system for avoidance of water hammer effect in pipe systems is presented in the paper. For such nozzle types, different pressure drops and flow rates, for different flow directions are expected, respectively. This fact is used to omit the water hammer effects, during sudden stops of the system; regardless if the system operates in turbine or pump mode. Special attention should be given to design of the nozzles due to the recirculation flows which can be induced with inappropriate geometry. According to this, computational fluid dynamics was used for nozzle design and flow analyse for different operating examples. Numerical simulation results were compared to experimental results measured at reversible pump – turbine model. Based on results agreement (pressure and overall characteristics) correct flow pattern for both operating regimes can be concluded.
Description: Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.
URI: http://hdl.handle.net/1860/1393
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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