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Folgende Abschlussarbeiten wurden an der Professur für Wasserbau betreut:
Experimental investigation of vortex flows
Art der Abschlussarbeit
Master
Autoren
- Spadari, Sergio Federico
Betreuer
- Dipl.-Ing. Nadine Müller
Abstract
Renewable and sustainable energy production is required to tackle the increasing energy demand, being hydropower a competitive option. In the last years, micro and mini hydropower potential attracted the attention in both developed and developing countries, resulting in many new technologies in this market sector. Environmental impact plays a crucial role nowadays, empowered by environmental laws as the European Water Framework Directive. In this context, the development of the water vortex power plant (WVPP) promises not only to be a renewable energy source but also a fish-friendly turbine allowing fish passage in both upstream and downstream directions.
With the focus on improving the flow conditions for fish to pass, a deeper understanding of the vortex flow is undertaken in this work, in a simplified configuration without the turbine of the WVPP. Therefore, the dependence of water surface elevation (wse) and three-dimensional velocity as a function of the discharge and tailwater conditions is studied by different measuring methods. Experiments are performed in a real scale WVPP physical model, in which the velocity field and wse are investigated by three-dimensional particle tracking velocimetry (3D-PTV), two velocity profiles are measured with acoustic Doppler velocimetry (ADV), and the water height is additionally accounted by several ultrasonic sensor gauges. The velocity results are compared with analytical models for tangential velocity distribution compiled in the literature review. In addition, the circulation distribution in the vortex basin is analysed and discussed. Among other things, the application of TORRICELLI’s equation was scrutinized in order to formulate the depth-discharge relation, and compared with other available models. Recommendations are given for the selection of tangential velocity and depth-discharge models while designing the units. Finally, comments on the secondary flow structure detected while performing the experiments are included.
With the focus on improving the flow conditions for fish to pass, a deeper understanding of the vortex flow is undertaken in this work, in a simplified configuration without the turbine of the WVPP. Therefore, the dependence of water surface elevation (wse) and three-dimensional velocity as a function of the discharge and tailwater conditions is studied by different measuring methods. Experiments are performed in a real scale WVPP physical model, in which the velocity field and wse are investigated by three-dimensional particle tracking velocimetry (3D-PTV), two velocity profiles are measured with acoustic Doppler velocimetry (ADV), and the water height is additionally accounted by several ultrasonic sensor gauges. The velocity results are compared with analytical models for tangential velocity distribution compiled in the literature review. In addition, the circulation distribution in the vortex basin is analysed and discussed. Among other things, the application of TORRICELLI’s equation was scrutinized in order to formulate the depth-discharge relation, and compared with other available models. Recommendations are given for the selection of tangential velocity and depth-discharge models while designing the units. Finally, comments on the secondary flow structure detected while performing the experiments are included.
Zugeordnete Forschungsschwerpunkte
- Wasserkraftanlagen
- Fischaufstieg und Fischabstieg
Zugeordnete Forschungsprojekte
- Wachstumskern - Fluss-Strom Plus VP4: Kaskade fischfreundliches Wehr; TP4.5:Entwicklung und ethohydraulische Analyse einer Multi-Wirbelstrombecken-Kaskade im 1:1- Labormodell
Schlagwörter
3D-PTV, Vortex Flow, Water vortex power plant, laboratory
Berichtsjahr
2019