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Hot Water Grate Boiler
Svoboda, Marek ; Šilhavý, Karel (referee) ; Lisý, Martin (advisor)
This thesis deals with design of hot water grate boiler, where the output is water with parameters 130 °C and pressure 16 bar. In the content of the whole thesis is gradually introduced a stoichiometric calculations, which is based on the specified fuel – wood chips. This is followed by the design of the individual heating surfaces according to the thermal calculations given in the thesis. Finally, the calculation is extended by hydraulic and aerodynamic losses. Dimensional design, as a basic scheme, is shown at thesis. More detailed drawing documentation is attached to this thesis.
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Valves of the rocket fuel systems and engines
Kadlec, Jan ; Štefan, David (referee) ; Kozák, Jiří (advisor)
The main aim of this bachelor thesis is developing a search about rocket valves. For better understanding of the function and position valves is chosen a real rocket engine. The types of valves are described by shape of closing component. There are also mentioned the most common rocket fuels. The other aim is developed a simple design of shut-off valve with specialization on hydraulic losses.
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Hydrostatic drive of multi-purpose loader DAPPER
Vydra, Tomáš ; Merenda, Lukáš (referee) ; Škopán, Miroslav (advisor)
This thesis deals with design of hydrostatic drive for multipurpose loader and tool carrier DAPPER. At the beginning is research of different basic concepts and modern solutions to the problem, aided by a detailed description of competitive machine in the same performance category. Extensive comparison with other producers is included in the annexes to this thesis. Furthermore, a theoretical driving characteristic and its appropriateness is examined further on the basis of two model situations. The calculations of the individual components of the hydraulic circuit precedes drive kinematics analysis of articulated machine frame, on it final conception of hydrostatic drive is chosen. Firstly hydromotors and hydogenerator are chosen on the grounds of calculations then hydraulic hoses, filters and flow divider. Next chapters are aimed to calculations of hydraulic losses and thermal calculation of hydraulic circuit. Final part deals with introduction the final characteristics of drive. The practical parts of the work are assembly drawings with main power components and hydraulic schematic of drive.
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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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Fractal geometry application for orifice plate design
Hochman, Ondřej ; Fic, Miloslav (referee) ; Rudolf, Pavel (advisor)
Bachelor thesis consists of three parts. The first part is focused on research study of cav-itation and fractal geometry. It is concerned with the physical principle of cavitation, its generation, dynamics and implosion of cavitation bubbles. It also turns attention to useful application. Brief explanation of fractal geometry follows, including some famous examples. Two fractal shaped orifices were designed in the second experimental part, having the same cross-section as orifice with ordinary circle hole. These orifices were compared to each other from perspective of hydraulic losses.
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Hydraulic losses during unsteady flow of liquid in a pipe
Svoboda, Jakub ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
This thesis is focused on solving hydraulic losses during unsteady flow of liquid in pipe for both laminar and turbulent flow in smooth pipes. Radial viscosity distribution is assumed to be the same as for steady flow. Viscosity distribution is derived from velocity profile, which is mathematically described with suitably chosen function. Laplace images of unsteady velocity profile and mean velocity in cross-section are derived depending on pressure difference. Loss coefficient is derived and on base of transfer matrix method, self-numbers are calculated. Self-numbers represent attenuation and own frequency. Self-numbers are compared to values from software called “F-ACHAR” and loss coefficient is compared to the one for quasi-steady method.
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Impact of air vessel resistance on water hammer
Novotná, Markéta ; Habán, Vladimír (referee) ; Himr, Daniel (advisor)
The thesis deals with the effect of an air vessel on water hammer, with special accent on the resistance of the air vessel connection and its effect on water hammer damping. The thesis describes the methods of water hammer protection, the possibilities of numerical solution of water hammer, as well as technical applications that use hydraulic shock. One chapter is focused on the hydraulic losses that define the resistance of the air vessel connection. For the model example, a numerical model was made using the method of characteristics, which was then compared with experiment and modified to describe the real process as accurately as possible. Therefore, some of the numerical model inputs were also determined experimentally.
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Diaphragm pump
Veselý, Přemysl ; Dobšáková, Lenka (referee) ; Pochylý, František (advisor)
The central goal of this work is to optimize the performance of the diaphragm pump so that it is able to operate under the given conditions, which at this moment do not meet. In the first part of the thesis, a basic research was created about diaphragm pumps, their simple division, inclusion in positive displacement pumps and the history of their development. In the following chapter, their construction and the meaning of each part of the machine was described in detail. Furthermore, several basic CFD calculations were carried out with the aim of locating the places with the greatest hydraulic losses. These analytical calculations were subsequently compared with practical experiments, from which the intention was derived. In the next point, based on these facts, several final adjustments were made with the aim of optimizing the performance of the entire system. After that, these design measures were further investigated and evaluated.
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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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Hot Water Grate Boiler
Svoboda, Marek ; Šilhavý, Karel (referee) ; Lisý, Martin (advisor)
This thesis deals with design of hot water grate boiler, where the output is water with parameters 130 °C and pressure 16 bar. In the content of the whole thesis is gradually introduced a stoichiometric calculations, which is based on the specified fuel – wood chips. This is followed by the design of the individual heating surfaces according to the thermal calculations given in the thesis. Finally, the calculation is extended by hydraulic and aerodynamic losses. Dimensional design, as a basic scheme, is shown at thesis. More detailed drawing documentation is attached to this thesis.
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