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Study of turbine with side channel runner
Jandourek, Pavel ; Haluza, Miloslav (referee) ; Pochylý, František (advisor)
This thesis deals with proposal of constructional solving turbine with side channel. Basis for the design is lossy characteristics of the valve. The intention is to replace hydraulic closures by turbine with side channel runner. Hydraulic losses in the flow restriction in turn replaced by the electricity generation in the comparable characteristics of valve and turbine.
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Draft automatic pressure pumping stations
Plachý, Jiří ; Vlašic, František (referee) ; Dvořáček, Jiří (advisor)
The aim of this thesis is a complete draft of automatic pressure pumping station for apartment house, including centrifugal pump with electric motor, control unit and accessories in the form of pipe system, valves and pressure elements. Thesis is focused on calculation and construction of centrifugal pump, which would be able to use separately without placement to the whole pressure station. The idea is to create the station with request to the higher water-flow against commonly available standards and equally to achieve small production proportion, weight and mobility of the facility. The construction is furthermore focused on supporting elements and general layout of pressure pumping station setup. All electronics, pipes and measurement parts are solved as a purchased elements.
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Compressor Turbocharger Design
Domanský, David ; Škorpík, Jiří (referee) ; Fiedler, Jan (advisor)
The master's thesis deals with compressor turbochargers used for supercharging of combustion engines. The aim of the thesis is feasibility study of compressor surge limit simulation. First of all the principle and purpose of supercharged combustion engines is described and the compressors' types using for supercharging are mentioned as well. The main part of the thesis is focused on flow instabilities and their influence on compressor operating zone. There are mentioned some possibilities of operating zone extension. The practical part comprises the simplified computation of a one stage of centrifugal compressor and flow analysis by means of CFD simulation.
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Construction of reversible swirl turbine
Kosar, Jakub ; Štégner, Ladislav (referee) ; Haluza, Miloslav (advisor)
The thesis deals with the construction design of reversible swirl turbine used in a tidal range power plant for bidirectional operation. The theoretical part provides an overview of state-of-the-art technologies in the usage of tidal energy, mostly by means of tidal range and stream tidal power plants. It also analyses respective designs of tidal turbines and their advantages and disadvantages. The practical part of the thesis demonstrates individual steps applied when examining loading forces and also shows the design method and strength inspection procedure of the turbine and its parts, especially of the impeller, gears, shafts and bearings. Lastly, the paper outlines the selection approach of the most appropriate water plant generator.
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Design of a Very Low Specific Speed Pump
Chabannes, Lilian ; Sedlář, Milan (referee) ; Drábková, Sylva (referee) ; Rudolf, Pavel (advisor)
Čerpadla s nízkými specifickými otáčkami nacházejí uplatnění v široké škále aplikací, ale trpí nízkou účinností a rizikem nestability křivky dopravní výšky. Tato disertační práce pojednává o vylepšení hydraulických parametrů čerpadla se specifickými otáčkami ns = 32. Práce se zaměřuje na průtok v oběžném kole a ve spirále, které jsou řešeny pomocí CFD. Průzkum literatury ukázal, že přidání mezilopatek do průtokového kanálu je účinný způsob, jak zlepšit neuspokojivé proudění obecně přítomné v oběžných kolech s nízkými specifickými otáčkami. Byla zkoumána poloha mezilopatky v kanálu a vliv počtu přítomných mezilopatek. Část výsledků je ověřena experimentálně v laboratoři fakulty. Rovněž je zkoumán tvar spirály a pozornost je věnována numerickému řešení proudění u stěn a jeho vlivu na simulaci. Po numerických výpočtech na třech různých spirálách je navržen nový tvar, který zlepšuje vypočtové parametry čerpadla při nízkém i vysokém průtoku.
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Construction of reversible swirl turbine
Kosar, Jakub ; Štégner, Ladislav (referee) ; Haluza, Miloslav (advisor)
The thesis deals with the construction design of reversible swirl turbine used in a tidal range power plant for bidirectional operation. The theoretical part provides an overview of state-of-the-art technologies in the usage of tidal energy, mostly by means of tidal range and stream tidal power plants. It also analyses respective designs of tidal turbines and their advantages and disadvantages. The practical part of the thesis demonstrates individual steps applied when examining loading forces and also shows the design method and strength inspection procedure of the turbine and its parts, especially of the impeller, gears, shafts and bearings. Lastly, the paper outlines the selection approach of the most appropriate water plant generator.
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The Pump with a Diffuser with Stochastic Blades (Runner and Diffuser)
Dobšáková, Lenka ; Melichar, Jan (referee) ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This doctoral thesis studies the non-uniform blade cascade for centrifugal pumps. Influence of non-uniform blade cascade is investigated on the impeller and diffuser. A non-uniform blading impeller of pumps in this doctoral thesis was examined in terms of influence on efficiency characteristic. The idea of using non-uniform blading is to obtain a flat efficiency characteristic. Then the centrifugal pump could be used on larger scale of power with achieving a sufficiently high efficiency. The work is based on experimental measurements and numerical simulations of non-uniform hydraulic pump components. Non-uniform impeller and the diffuser were newly designed for this research. A new measuring track of small submersible pumps was needed to design and build for measurements. Different pump combinations with conventional hydraulics on one working point and hydraulics with non-uniform were measured. All measurements were evaluated and characteristics of efficiency, head and power were obtained for each measured combination. Some of pump combinations (which were measured in experiment) were numerically simulated by program Ansys Fluent. Data needed to evaluate the characteristic of efficiency and specific energy were collected from each numerical simulation. A theoretical consideration concerns the influence of non-uniform blade cascade applied on diffuser. The suggestion how to decrease hydraulic losses in canals was done. The theoretical consideration how to make a flat efficiency characteristic was made.
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