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The influence of number and position of stay vanes on characteristic of Francis turbine
Mraček, Pavel ; Skoták, Aleš (referee) ; Haluza, Miloslav (advisor)
The thesis deals with the influence of the number and position of stay vanes on the characteristic of a Francis turbine. The main objective is to find the most hydraulically advantageous configuration by CFD simulations. It was important for this work to use comparable methods, in particular the same turbulence model and computational grid. The output of the thesis is a comparison of hydraulic losses for different configurations of the position of guide vanes and number of stay vanes.
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The influence of number and position of stay vanes on characteristic of Francis turbine
Mraček, Pavel ; Skoták, Aleš (referee) ; Haluza, Miloslav (advisor)
The thesis deals with the influence of the number and position of stay vanes on the characteristic of a Francis turbine. The main objective is to find the most hydraulically advantageous configuration by CFD simulations. It was important for this work to use comparable methods, in particular the same turbulence model and computational grid. The output of the thesis is a comparison of hydraulic losses for different configurations of the position of guide vanes and number of stay vanes.
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Numerical simulation of rotor-stator interaction (RSI) of Francis turbine
Machoň, Matěj ; Skoták, Aleš (referee) ; Štefan, David (advisor)
The master's thesis deals with the numerical simulation of rotor-stator interaction (RSI) of Francis turbine. In the selected operating point of the machine, the pressure amplitudes belonging to RSI frequencies are evaluated in various pressure sensors and compared with available experimental data. Various simplifications of the simulation, namely using Transient Blade Row Modelling, are done and their impact on results is investigated. Lastly the modal analysis with acoustics elements present is performed to obtain the eigenfrequencies and mode shapes of the runner submerged into water to be able to conclude, if the resonance occured.
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The turbine regulation of the small hydro-powerplants
Horký, Jiljí ; Dobrovolný, Martin (referee) ; Stareček, Jakub (advisor)
This bachelor thesis deals with the regulation of water turbines in small-hydro power plants. The first chapter presents the basic theory of this issue. In the next following two chapters, the characteristics of individual types of turbines, their construction and construction of control mechanisms are introduced. With the help of velocity triangles is shown, how the flow conditions are changing during the work of control mechanisms and what influence the control has on the hydraulic machine.
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Feasibility study of the pumped storage power station
Bolek, Marek ; Špano, Miroslav (referee) ; Dráb, Aleš (advisor)
The aim of this bachelor thesis is to create a study that deals with the construction of the machine cavern of the shaft-type pumped-storage power plant containing 4 machine sets of the Reverse Francis Trubine with underground penstocks and short discharge tunnels, located in the area of a quay in Vaňov in the Ústí nad Labem District. The introduction deals with the pumped-storage power plants in general. The following chapter focuses on the assessment of the locality of interest. The final part contains a proposal of a structural-technological design of the machine cavern by means of a technical report, a design of the spiral case and documentation of the structure by means of drawings.
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