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Design of a hydraulic system for long-distance water transport
Dobrovolný, Martin ; Kozubková, Milada (referee) ; Veselý, Jindřich (referee) ; Pochylý, František (advisor)
The Ph.D. thesis aims to design a hydraulic system for long-distance water transport by the serial connection of axial pumps. Specifically, there is presented an analysis of the axial centrifugal pump prototype, which was tested. The prototype has a specific design. An asynchronous electric motor with a hollow-shaft rotor is used. The pump's impeller is pressed into the hollow shaft. Some advantages follow from the design compared to common pumps and pumping stations. For example, it is possible to designate a compact design of a pump and lower pressure load of pipe, so the elastic material for the pipe's wall can be used. However, the main disadvantage of this design is related to the large rotating diameter, where the pump's seals are located. It leads to quite large mechanical losses on seals and in the context of relatively small hydraulic power also to small efficiency. Therefore one part of the Ph.D. thesis is focused on the pump's seal. The result of the work is a new design of the mechanical face seal with a spiral grooves. The seal was manufactured and subjected to the test. During the testing of the prototype axial pump, it was also revealed inappropriate hydraulic design. Therefore it was necessary to redesign the impeller and guide vanes of the pump.
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Hydrokinetic swirl turbine
Fryčar, Michal ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
There has been a notable increase in interest in renewable energy harvesting over the past two decades. This has been accompanied by the emergence of new technologies and research, which are driving developments in this area forward. One of the sources is also kinetic energy of river streams and tidal currents. The aim of this thesis is to formulate fundamental equations for the utilisation of kinetic energy of water and to design a hydraulic model of a swirl turbine runner. A further aspect of this thesis is to verify the previously formulated equations in the computational modelling software Ansys CFX and to analyse the effect of the draft tube on the power output of the turbine.
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Hydraulic solution of the swirl turbine for locality of Rosenauer mill
Pavlíček, Tomáš ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This thesis focuses on the design of a swirl turbine for the site of Rosenauer Mill, where the gross hydraulic head HB is 1 m and the flow rate is Q is 1.6 m3/s. The beginning of the work is dedicated to microturbines and explains why a swirl turbine is suitable for this location. The procedure applied for developing the hydraulically active surfaces of the turbine is then presented. Firstly the design of the blades is based on analytical formulas, which are further refined using the CFX Ansys program. The turbine is closely affected by the inlet and draft tube, therefore their design is also included in this thesis. The hydraulic calculations yield the resulting parameters and characteristics of the designed turbine, calculated from the entire assembly using CFD computations. The final section of the work is devoted to the design of main structural components such as the gear, shaft, and bearings. The hydraulic design developed in this thesis serves as the basis for implementing the swirl turbine and constructing a small hydraulic power plant at the Rosenauer Mill.
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Spiral case design for fountain turbine Katovice.
Čípa, Jiří ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
The diploma thesis should identify inconsistencies of the small hydraulic power plant Katovice. The fountain water turbine is now running in slower delivery because the original Francis high speed turbine achieved much smaller flow than a Kaplan type turbine. The aim of the thesis is a project of a spiral case and a distributor for the Kaplan turbine, which should work in higher flow and should be run in its optimum. This project will serve as a base for construction of distributor and spiral case for the small hydraulic power plant Katovice.
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Analysis of the Velocity and Pressure Fields of the Liquid Using Curvilinear Coordinates
Stejskal, Jiří ; Kozubková, Milada (referee) ; Kučera,, Radek (referee) ; Veselý, Jindřich (referee) ; Pochylý, František (advisor)
This work introduces a new method of hydraulic design of a centrifugal pump impeller. This method is based on a geometrical approach employing curvilinear coordinates that are used to formulate both the axisymmetrical flow model in a meridional shape and the final model of flow in a blade cascade taking into account the full 3D shape of the impeller blade. The solution to this model then directly provides the guidelines for shaping the impeller blade in order to suppress the secondary flows, thus increasing the impeller efficiency, which is demonstrated on a real impeller design case. The partial differential equations describing the flow in the blade cascade are numerically solved piecewise on each particular stream surface, which leads to a significant reduction of computational time.
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Improving of hydraulic properties of swirl turbines
Kůrečka, Jan ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This diploma thesis describes design of blade geometry of swirl turbines with different blade row density for given parameters Q11 = 1,9 [m3s-1], n11 = 170 [min-1], H=2,5 m, and =0,8. Goal is to found out differences between designs with high count of runner blades and design with fewer blades. Comparison of computed characteristics of three, seven and nine bladed runners is given.
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High Speed Turbine with Non-Uniform Cascade
Stareček, Jakub ; Drábková, Sylva (referee) ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This doctoral thesis is focused on hydraulic design of axial turbine by CFD and FEM analyses. The results are runners with nonuniform cascades. Nonuniform runners consist of blades with different axial positions, blades with different pitch angles in runner or indifferent blades. Each runner is designed with respect to 3D printing by FDM or SLS technology and hydraulic measuring. The analyses of the excitation frequencies, modal analysis, shape of the turbine operating range, maximal efficiency, output parameters and cavitation properties are emphasized.
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Modification of pump for turbine regime
Jahn, Jan ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
Hydraulic design of a hydrodynamic machine is designed to achieve a high value of energy transformation efficiency. Pumps and turbines have some different typical features in hydraulic design. With the aid of computational fluid dynamics, adjustments of the hydraulic parts of a standard centrifugal pump are assessed with the aim to increase hydraulic efficiency of the pump running as turbine. The impeller, volute casing and added draft tube are discussed.
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The design of Pelton turbine for given parameters
Pavlíček, Tomáš ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
The aim of this bachelor's thesis is to create a project of a small Pelton’s turbine for laboratory use, focusing on the design of nozzle and blade. Designing these two parts included beam measuring, calculating the losses in the piping and finding the working point of the pump. In its first part this thesis reviews the history, the operating principle and the main parts of the Pelton’s turbine. The next part includes finding the appropriate shape of nozzle and measuring the beam, followed by the calculation of lossy coefficient and efficiency of the nozzle from the measured values. The third part is dedicated to calculation of losses in the piping and finding the working point of the pump. In the last part, blade is designed.
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