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Water Jet Cutting
Odehnal, Ondřej ; Fic, Miloslav (referee) ; Kárník, Jan (advisor)
The following bachelor’s thesis deals with an unconventional technology of waterjet cutting. Content of the thesis is focused on the description of the technology, basic classification and description of utilization methods. Machinery used in this technology is described below. At the beginning, this work introduces the history and describes the principle of the water jet. Following is the classification of the methods used for water jet. The most important components of devices operating with this technology are described in the next section. The last part is the description and evaluation of an experimental verification of theoretical knowledge. The quality of cut and the behavior of the water jet was examined for different cutting parameters on cutting samples. Evaluation of the thesis is included in the conclusion.
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Rainwater-treatment and rainwater utilization
Štefek, Miroslav ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
The aim of this bachelor thesis is developing searches which are focused to treatment with rainwater and it's next utilization. We can find general information about situation in Czech Republic in this work and we can also read about products for rainwater treatment which are available in the market. There is a calculation for house too where we can see if it is advantageous step if we'll purchase rainwater treatment products.
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Measuring of Velocity Profiles in Liquids by Using of UVP
Kárník, Jan ; Stejskal, Jiří (referee) ; Štigler, Jaroslav (advisor)
The following bachelor's thesis deals with one possible way of determination velocity profiles in liquids. Content of the thesis is focused mainly on the method of the UVP (Ultrasound Velocity Profile), on the ways and principles of measuring, on its pluses and cons and it´s comparison with the other conventional methods, like for the example the PIV (Particle Image Velocimetry) and LDA (Laser Doppler Anemometry). There is also the possible placement of the transducers to the measuring system discussed. Furthermore the thesis deals with trouble in the test measurement. At the beginning this work deals with familiarization with principle and function of the measuring device and with the device for the method UVP itself. Apart from the UVP measuring method the thesis also deals with short description of the competitive methods – PIV, LDA, which are used to measure the velocity profiles nowadays. Particular attention is given to the PIV method, which significance is currently growing. In conclusion, there is comparison of different methods with the UVP method made and there are the future steps to realize the successful measurement with UVP method also discussed.
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Design of device for water jet erosion of materials
Mikulášek, Tomáš ; Kárník, Jan (referee) ; Rudolf, Pavel (advisor)
The aim of this diploma thesis was to design experimental setup for planar samples erosion by means of the water jet on the rotational sample configuration, laboratory experimental testing and its evaluation by means of the 3D optodigital microscope Olympus DSX 510. There were observed typical erosion patterns at the solid tested material surfaces as well as the cavitation erosion. Experiments were carried out at the following water pressures: 0.432 MPa, 1.50 MPa on the rotating sample, at 2.50 MPa on steady sample and on flooded sample for different treatment times. Experimental results of waterjet impact on rotating sample were compared with the theoretical modelling data obtained by CFD modelling. Computational modelling was done in two parts: 3D modelling of water jet flow impact on rigid steady surface and 3D modelling of water jet impact on rigid moving surface. The latter modelling was solved as two phase modelling, where the computational model “Volume of Fluid” was employed. The aim of the study was to find out for the individual cases under study appearance of the water flow and the changes of the magnitude of the force of the impinging water jet on the wall.
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Mobile Water Treatment Plants
Trlica, Karel ; Moravec, Prokop (referee) ; Kárník, Jan (advisor)
This bachelor thesis deals with technologies of drinking water treatment. The focus is on comparison between mobile water treatment systems and ground water treatments. The first part of thesis is concerned with technology and construction of container water treatment system, while pointing out the benefits associated with its usage. The next part of thesis deals with ground water treatment system, analyzes its technologies and advantages. The thesis also assesses the performance differences between classic and container water treatment systems, while taking into account usage of mobile water treatment systems for specific conditions. The last part deals with specific water treatment systems, that is the container water treatment system CCW KU-1 and the water treatment system in Valašské Meziříčí. The thesis strives to explain both water treatment systems in detail. Overall evaluation and set of specific differences between the water treatment systems is included in the conclusion of the thesis.
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The Fluid Flow Between Two Paralel Plates, the Comparison Between the Measruring and The Analytical Solution.
Kárník, Jan ; Hudec, Martin (referee) ; Štigler, Jaroslav (advisor)
This master's thesis is focused on measurement of the velocity profiles in liquids using ultrasound. The thesis describes two executed measurements both in the channel with free surface, both in the square shaped pipe. In the introductory part this work deals with clarifying the theoretical fundamentals associated with the measurement method UVP such as the Doppler effect, the speed of sound in the medium or the acoustic impedance of the environment. The next part describes the execution of the velocity profile measurement in the channel with free surface described and there is also the description of the results achieved during this measurement. In the last part the thesis deals with the measurement of the velocity profile in the square shaped pipe. There is also the comparison between the measured velocity profiles and the velocity profiles calculated using the analytical formula. In the conclusion there is the evaluation of achieved results.
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High pressure hydraulics in agricultural machinery
Pavlík, Václav ; Kárník, Jan (referee) ; Soukup, Lubomír (advisor)
This bachelor thesis provides an overview of the most used ways of converting kinetic energy into pressure energy and the other way around by using hydrostatic converters. It is focused on the issue of high-pressure hydraulic mechanisms in agricultural machinery. In the next section I focused on getting an overview of the function of sophisticated hydraulic systems in current tractors and calculation of heat losses of lifting weight by front three-point hitch. For solving was used Bernoulli equation for real flow in pipes.
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Automatic Irrigation Systems
Vrbka, Tomáš ; Fic, Miloslav (referee) ; Kárník, Jan (advisor)
This bachelor’s thesis deals with the possibilities of using automatic irrigation systems. The goal of this thesis is to create a design solution for specified parameters of the football pitch. The parameters include dimensions of the pitch and the parameters of already placed pump. In addition to the design solution the thesis includes theoretical part which deals with the description, design and installation of an automatic irrigation system and its components in addition to design solution. The thesis also includes the calculation of pressure losses of the irrigation system and a price estimate for the designed components of the irrigation system.
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Hydrobike - feasibility study
Kunovský, Lukáš ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
This bachelor thesis presents a project of hydraulic system which is intended specifically for bicycle drive and is realized through hydrostatic transducers. It gives information about necessary components and about the procedure of their selection. In this procedure it focuses particularly on weight reduction and loss minimization. Apart from the considerations as such, it also analyzes prior concepts and adopts suitable improvements from these. In the presented plan it demonstrates a method of effective verification of the real parameters of the whole as well as of the partial components.
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Optimizing of a hydraulic part of a cooling system of a hot-air slide valve
Melecký, Josef ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
Master´s thesis deals with hydraulic optimisation of a hot blast gate valve. The valve must be cooled down, because of very high temperature that is exposed to. The existing cooling system is oversized and uneffective. This gave opportunity to create a brand new system, that would lower operating expenses. The first part of the thesis is dedicated to comparsion between both systems from the point of the total pressure loss. The second part of the thesis deals with hydraulic optimisation of the new system. Computations are modelled in CFD.
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