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Device for calibration of sensors for small velocity
Řezníček, Ondřej ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The Bachelor thesis deals with the search of splitting methods for measuring flow velocity, from which describes the mechanical and thermo anemometers. There is also done these search methods of equipment calibration, which is based on the design solutions implemented calibration device, which uses a moving of measuring instrument. Engineering design is shown on the attached design drawing.
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Computational model of heat cycle of Stirling engine
Horák, Jiří ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
This Bachelor´s Thesis deals with heat circulation of a Stirling engine according to the Schmidt theory. In the first part of the thesis there is a short view and characteristic of computational methods for Stirling engine and there are also a few computational models illustrations. The second part describes the Schmidt idealization and its process within the program environment. The final part of the thesis is focused on the realization of the optimal parameters design using a computational model as well as on the comparison of theoretical results with real measured value.
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Unconventional heat cycles
Snášel, Jan ; Košner, Jan (referee) ; Jedelský, Jan (advisor)
The bachelor thesis is describing four unconventional heat cycles and devices which are using them. It is Stirling cycle, organic-Rankine cycle, Kalina cycle and Brayton cycle. The cycles are described in terms of the main parts of their devices and in terms of their thermomechanical principle. In thesis are also stated applications for each cycle and their advantages and disadvantages. There are also stated formulas for the ideal cases of cycles to calculate specific work done, specific input heat flow and efficiency of cycle.
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Fluorescenec spectroscopy in study of aerosol-forming substances
Lippay, Josef ; Jedelský, Jan (referee) ; Mravec, Filip (advisor)
To study the spectral characteristics of a substance DEHS several experiments were suggested. Closer investigation was made on study of the effect of different environments on the spectral properties of the substance DEHS. It was found that the highest positive effect on the fluorescence of the substance DEHS have a medium with hydroxyl groups. IPA was evaluated as the best medium for further experiments. It was found that the medium xylene decreases intensity of the fluorescence to the detection limit. Spectral characterization of the nondegraded and degraded DEHS was performed. It was found that for the degraded DEHS shift to higher wavelengths occurs due to degradation. Possible contamination of the DEHS with substances causing luminescence has not been proven.
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Flow visualization methods
Ďurdina, Lukáš ; Jedelský, Jan (referee) ; Lízal, František (advisor)
ĎURDINA, L. Flow visualization methods. Brno: Brno University of Technology, Faculty of Mechanical Engineering, 2010. 45 p. Thesis supervisor Ing. František Lízal. This thesis deals with fluid flow visualization methods with respect to their practical application possibilities. Chronological description of the historically valuable visualization experiments emphasises the role of visualization in the experimental fluid mechanics. A brief characteristic of the flow field contains mathematical description of the objects, which can be visualized. Visualization methods are divided into experimental and computer aided methods. Individual methods are ordered subsequently beginning with those with lowest requirements for equipment to the more sophisticated methods. Various techniques, which provide qualitative and quantitative description of the tested gas or liquid flow, are described. The overview for the choice of methods for various applications sums up the important facts from previous chapters. Description of a simple helium bubble flow visualization experiment realized in a lab can be found at the end of the thesis.
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Supercharging of internal combustion engines
Vrána, Jan ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
In supercharging are applied mainly two ways - turbocharging or charging using a mechanical compressor. The aim of thesis was to compare the ideal cycles of internal combustion engines with ideal cycle of supercharged engine, write down the main problems of supercharging, especially the border of self-ignition of fuel and detonation ignition, advantages and disadvantages of different methods of supercharging and its effect on engine efficiency. Further, there are given basic construction designs of turbochargers and air coolers and some special methods of supercharging and cooling.
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Ideal cycle turbocharged internal combustion engines
Hrubý, Jakub ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The aim of this thesis is description of various charging methods as a one of the most attainable form of ramping up the power and fuel consumption efficiency of naturally aspirated engines nowadays. Main aspect is thermodynamic part of the whole problem, especially the comparison of thermal efficiencies between different cycles. After a short history brief, main reasons why is charging so important are answered. General description, work principles, advantages and disadvantages of new technologies are also included. Emphasis is aimed at topicality and graphic interpretation. Thesis is dealing with charging diesel engines, but also petrol engines in automotive industry and offering a possible way of future development.
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Heat engines for waste heat utilization
Macháček, Pavel ; Lízal, František (referee) ; Jedelský, Jan (advisor)
This thesis deals with heat cycles for waste heat utilization and their comparison. The first part describes particular heat cycles, their basic modifications and working principle, their advantages and disadvantages and typical applications. The second part is dedicated to technical parameters and creating of idealized models of those cycles on the basis of gained data. The comparison of the cycles is also done.
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Fuel for internal combustion engines
Vrbický, Jiří ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
This thesis is concerned with basic features of fuels for internal consumption engines, especially their influence on thermal efficiency. It also introduces dividing of fuels and their compare in ecologic, economic and technologic side. It is concerned convectional fuels (gasoline, diesel oil) and alternative fuels (nature gas, bottled gas, hydrogen, biodiesel, biogas, methanol and ethanol).
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Ideal cycles of internal combustion engines
Marušák, Ondřej ; Jedelský, Jan (referee) ; Štětina, Josef (advisor)
The thesis set out the basic thermodynamic circulation and their properties. For these orbits are shown ideal cycles gas engine and diesel engine, in which investigating thermal efficiency depending on the change in their characteristic parameters. The results are reported in tables and diagrams. For each of the engines is also a table with most values the compression ratio, the final compression pressure, the final compression temperature and maximum combustion pressure. Finally, we compare the thermal efficiency of the two orbits in the T-s diagrams.
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