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Aerodynamic components of passenger cars
Petrskovský, Adam ; Vančura, Jan (referee) ; Vondruš, Jan (advisor)
This bachelor thesis is focused on aerodynamics of the cars. Theories on aerodynamics characterizations as well as force exertions are presented here. Moreover, the influence of aerodynamics on fuel consumption and formation of harmful emissions is described. The thesis also provides a comprehensive overview of particular aerodynamic devices used on cars. Furthermore, CFD simulations of four aerodynamic devices on a simplified model of car are included. The results of these simulations are then evaluated and the respective aerodynamic devices are subsequently compared to find out which of them has contributed the most to the improvement of aerodynamic characteristics of the vehicle.
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Visualisation of the velocity field behind the cooling fan of a passenger car
Vrubel, Vít ; Vondruš, Jan (referee) ; Šebela, Kamil (advisor)
This thesis discusses the development of a program and methodology for measuring the velocity vector field behind the fan of a passenger car using image analysis and recording the movement of the tufts. The theoretical part briefly describes other methods for measuring the vector field in the gas stream at low speeds. Furthermore, the work contains a selection of technical papers dealing with similar issues is also presented. In the following chapters a general description of the equipment used is given. The last part of the thesis is devoted to the design of the measurement condition and the development of the program for the actual evaluation. Finally, an evaluation of the method and possible future developments are discussed.
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Stirling Engine
Vondruš, Jan ; Kloss, Ondřej (referee) ; Kaplan, Zdeněk (advisor)
This bachelor thesis deals with the description and calculation of a closed regenerative thermodynamic cycle. In the theoretical part of the thesis, there is described history of the engine, the principle of its function, differences between particular design variants, and the use of the engine in the past and nowadays. In the other part of the work, there is described the principle and calculation of ideal Stirling cycle. In addition, there are included positives as well as negatives of applying the heat devices based on this cycle. Practical part of the work deals with the calculation of ideal Stirling cycle with the use of Schmidt theory. The primary aim of this bachelor thesis is then to compare and contrast the results gained from both of the calculation methods. In the end, the results of the thesis show that the use of Schmidt theory gives lower, i.e. more accurate, values of engine's parameters compared to the use of Stirling ideal cycle.
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Air flow measurement through compact heat exchanger in wind tunnel
Žůrek, Michael ; Vondruš, Jan (referee) ; Šebela, Kamil (advisor)
This thesis describes Formula Student competition, overview of used aerodynamic devices, placement of compact heat exchangers on these monoposts and current monopost Dragon e2. Next section examines commonly used compact exchangers and their aerodynamic drag, mainly caused by angling and ununiform flow. Subsequently is described the process of preparation, measurement in wind tunnel and measuring devices. An algorithm was created and described, which was used for evaluation of measurement, influence of some factor was commented. On the right-side compact exchanger, methods of measuring were compared, namely pneumatic probe, pressure difference and turbine anemometer. On left side exchanger were observed influence of various aerodynamic elements. Lastly alternative position behind vehicle rear axle was measured.
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Aerodynamics of an electric vehicle and a vehicle with combustion engine
Mikula, Marek ; Kocman, František (referee) ; Vondruš, Jan (advisor)
This bachelor thesis focuses on describing the differences in aerodynamics between electric and internal combustion engine cars. For the same vehicle model lines and different powertrains, a survey of today's market has been conducted and the thesis has been complemented with the current topic of the implementation of active aerodynamic features and systems for vehicles in different price ranges with different aerodynamic requirements.
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Stirling Engine
Vondruš, Jan ; Kloss, Ondřej (referee) ; Kaplan, Zdeněk (advisor)
This bachelor thesis deals with the description and calculation of a closed regenerative thermodynamic cycle. In the theoretical part of the thesis, there is described history of the engine, the principle of its function, differences between particular design variants, and the use of the engine in the past and nowadays. In the other part of the work, there is described the principle and calculation of ideal Stirling cycle. In addition, there are included positives as well as negatives of applying the heat devices based on this cycle. Practical part of the work deals with the calculation of ideal Stirling cycle with the use of Schmidt theory. The primary aim of this bachelor thesis is then to compare and contrast the results gained from both of the calculation methods. In the end, the results of the thesis show that the use of Schmidt theory gives lower, i.e. more accurate, values of engine's parameters compared to the use of Stirling ideal cycle.
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