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Flow of Newtonian liquid through a flexible tube
Slonek, Matouš ; Illík, Jakub (referee) ; Klas, Roman (advisor)
This bachelor's thesis focuses on the flow of newtonian liquid through a flexible tube. The theoretical part consists of a review of various fields that flexible tube occurs in. In the next chapter were defined equations describing the flow of a liquid through a deformable tube and lastly, constitutive material models were stated. In the practical part, a one-dimensional FSI simulation of the flow of a liquid through a flexible tube was realized.
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Optimization of nozzles for firefighter sport
Páral, Filip ; Klas, Roman (referee) ; Fialová, Simona (advisor)
This thesis deals with flow inside of the firesport nozzles. Those are used for a fire attack, one of the firesport disciplines. The research part of this thesis introduces a fire attack, commonly used equipment and hydraulic losses that occur during the flow. This part also consists of an overview of current firefighting and firesport nozzles. It includes requirements for nozzles that are used in the fire attack discipline. Second part of the thesis presents the flow analysis inside firesport nozzles using commercial software for computational fluid dynamics (CFD), ANSYS Fluent. Several nozzle designs are proposed at the end of this thesis, based on conclusions from previous part. These designs satisfy firesport nozzle requirements, previously stated in this thesis.
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Economic view of the fast closing valve selection for HPP Vranov
Gipka, Ondřej ; Kuchař, Jan (referee) ; Klas, Roman (advisor)
The thesis deals with the evaluation of the investment in the fast closing valve replacement in The dam Vranov using Computational fluid dynamics (CFD). The final effects of the fast closing valve replacement will be examined on three different types of valves with regard to the turbine output in operation zone and without the influence of water intake runner and turbine draft tube. The aim of the thesis is to theoretically evaluate alternatives of the fast closing valve replacement and define its basic characteristics and classifications.
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The design of screw pump
Hyriak, Maroš ; Klas, Roman (referee) ; Haluza, Miloslav (advisor)
This thesis is concerned with the topic of Pumps with crew centrifugal impeller. Thanks to the benefits such as free passage and efficiency there are many practical applications of these products. Despite this fact there is only few manufacturers dealing with them what results in lack of research and available information in the area. In order to fill the gap, this thesis aims to propose hydraulic of screw centrifugal impeller to the specified parameters. The impeller with a single moving blade will be designed for pumping heavily polluted water and hardly pumpable liquids. Blade will be balanced together with the rotor, while the emphasis will be placed on the highest free passage of impeller. The theoretical part of the thesis summarizes literature on the subject, practical part deals with the calculations and adjustments pointing to a concrete proposal. Parameters of designed hydraulics were verified using stationary calculations using MRF model in FLUENT. As a results, two possible solutions are offered.
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Design of the hydraulic circuit of the ASC 110 vibratory roller drive
Novák, Martin ; Rada, Zdeněk (referee) ; Rada, Zdeněk (referee) ; Klas, Roman (advisor)
This thesis presents a proposal of newly designed concept for travel hydraulic circuit of vibratory single drum roller ASC 110. The maximum machine gradeability was chosen as the main parameter for hydraulic circuit proposal. After selecting the new hydraulic travel concept, suitable hydraulic components have been selected. Length and local losses for two different machine speeds were calculated for sufficient hydraulic circuit design. Hydraulic losses have also been calculated for use in different climatic conditions. A new machine cooling concept has also been proposed. Heating and cooling curves of hydraulic circuit were calculated. For the purpose of comparing gradeability and energy balance of the newly designed travel concept compared to the existing one currently in mass production, both machines were fitted with measuring points. On both machines were measured for example, pressure, flow and temperature in each hydraulic circuit branch and others. From the time dependencies of the above-mentioned parameters it was possible to determine the energy efficiency of the newly designed concept. To assess the maximum gradeability, the slope of the hill was measured. Comparing the two machines, it has been found that the two hydraulic circuit solution has significantly improved traction properties in demanding machine applications, especially when driving uphill and downhill. This concept also affects less fuel consumption and places less demand on the hydraulic oil cooler due to its energy efficiency.
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Vane pump
Mach, Jiří ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This work gives basic information about vane pumps, especially with unbalanced construction and vanes led by rotor. The first chapter generally gives an attention to pumps. There are described basic information, classification, advantages and disadvantages of the types, characteristics and calculation relations. The following chapters describe the vane pumps in the way of classification, description of function and calculation relations. There is also made a practical calculation of vane pump according to the assignment accompanied by CFD analysis.
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Unsteady CFD simulation of flow under a downward moving gate
Málek, Miroslav ; Štefan, David (referee) ; Klas, Roman (advisor)
Emergency gates are important safety feature of hydropower plants. They are used to close the flow in order to protect power plant equipment in case of emergency. In this diploma the-sis are realized CDF simulations of emergency closure of wheel-mounted gate on two-dimensional model of the Slapy hydropower plant. Simulations were performed for the case of constant lowering gate speed and for the case of gravitational closure. Dynamic mesh was used to enable the gate motion. The 6DOF method was used for the case of gravitational clo-sure and user defined function was defined to control movement of the gate. User defined function include gravitational force, hydrodynamic forces and friction force. Simulations were used to verify forces acting on gate and volume flow through gate during closing process. In case of gravitational closure the speed and orientation of closing process and closing process time were determined.
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Pump design
Čejka, Pavel ; Himr, Daniel (referee) ; Klas, Roman (advisor)
In this bachelor’s thesis are including basic information about dividing hydrostatic pump. In the first chapter of thesis will be introduced the basic dividing pumps namely on pump hydrostatic and hydrodynamic. Accordance with this dividing will be next introduced basic construction design of hydrostatic pump. With each one type of pump will be introduced their advantages and disadvantages, then also their description of function and their using in practice and all this will be eked with simple scheme or with picture of pumps. Next will be described individual characteristic parts of their construction. In the conclusion will be introduced basic numerical relations for characteristic value of pump and their interdependence will be described with diagrams.
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Testing of proportional hydraulic block characteristics
Vácha, Ondřej ; Klas, Roman (referee) ; Habán, Vladimír (advisor)
Goal of this thesis is to verify functions of hydraulic manifolds from new supplier, measure characteristics of pressure loss relative to flow rate and for proportional blocks also characteristics of flow rate relative to control voltage at constant inlet pressure. Verification will be carried out with proportional manifolds and on/off manifolds with different failure functions.
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Positive displacement pump design
Homola, Tomáš ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
The bachelor thesis is focused on positive displacement pump design. At the beginning of the bachelor thesis is described basic division of hydrostatic pumps, basic calculation relations and characteristic of liquids. The basic calculation relations are: actual flow, torque, efficiency and power consumption. Furthermore, in the individual pump types are described principle function, characteristics, uses, advantages and disadvantages. At the end of the thesis is mentioned current research, which conversant analysis of the force Gerotor pumps, where the cycloidal transfer made from thermoplastic (POM).
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