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Unsteady simulation of the Turbine-99 draft tube
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This study focuses on the flow in the elbow draft tube. This draft tube is placed just after a turbine in low head dams. Its goal is to convert kinetic energy into pressure energy with a minimum of losses. Computational fluid dynamic (CFD) is an interesting tool which enables accurate calculations of unsteady turbulent flows. This model testing is useful to optimize hydropower turbines and the cost is minimum. A such type of modelisation constitutes an important help for the modification of draft tubes since hydropower turbines have a life cycle of about 50 years. Nevertheless, this tool needs to have detailed boundary conditions. This study is based on the available boundary conditions made by previous experimentations on the Turbine-99. After building the geometry with ANSYS and creating the mesh with ICEM, simulations with CFX are performed. As the flow entering the draft tube is highly unsteady, transient simulations with unstationary boundary conditions are performed. Turbulence phenomenons are pointed out. Pressure recovery and energy loss factor are a good way to characterize the efficiency of the draft tube, that's why the study of them as a function of the time is realized. These simulations are done be using the k-e model.

Place, publisher, year, edition, pages
Keyword [en]
Technology, draft tube, computational fluid dynamic, transient, calculation
Keyword [sv]
URN: urn:nbn:se:ltu:diva-49651ISRN: LTU-EX--04/272--SELocal ID: 6f6b255c-b6a9-4d34-9065-6df6cfb2a588OAI: diva2:1022998
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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