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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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Air recirculation balance of the vehicle's cooling package
Macejka, Kamil ; Čavoj, Ondřej (referee) ; Vančura, Jan (advisor)
The focus of this thesis is to create an effective tool for quick analyses of hot air recirculation at the cooling package, wich is a significant factor that influences its effectivity, to evaluate this influence and to propose viable solutions for its mitigation. The theoretical part of the thesis is devoted to the description of the problem, review of existing scientific studies and introducing the mechanisms responsible for the studied phenomenon. The practical part contains an analysis of flow and thermal effects, whose outputs are used for developing an computational model with a graphical user interface. This model is further used for comparison of effects of various input parameters and based on its results the measures targeted on reduction of recirculation are designed, which are then evaluated using CFD methods.
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Calculation of aerodynamic characteristics of a vehicle under yaw conditions
Mračnová, Michaela ; Popela, Robert (referee) ; Vančura, Jan (advisor)
This diploma thesis focuses on unsteady CFD simulations of a vehicle with different geometric modifications exposed to side wind. The first part of the thesis deals with the evaluation of the aerodynamic characteristics of the vehicle under static yaw conditions determined by the unsteady calculation methodology and the subsequent validation of the used methodology based on the comparison of the results with experimental data. With use of given methodology, the second part of this thesis focuses on representation of unsteady effects occurring under exposure to atmospheric crosswind.
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Design of a device for measuring the center of gravity height of road vehicles
Hanych, Jaroslav ; Blaťák, Ondřej (referee) ; Vančura, Jan (advisor)
This master's thesis deals with problems connected with measuring vehicle centre of gravity height. The research part summarizes generally known methods of measuring vehicle centre of gravity and moments of inertia. Essential part of this thesis is the design of a device for measuring the centre of gravity height of a road vehicle on a principle of measuring a period of oscillation. The height position of the platform of the device is adjustable through hydraulic cylinders. A stress-strain analysis of the design was executed through a combination of analytical methods and a finite element method. The process of measurement was described and an equation for determination of centre of gravity height was deduced. Error of measurement was estimated based on the knowledge of partial errors of measured values.
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Methods of reducing aerodynamic drag of automobiles
Šimbera, Michal ; Vančura, Jan (referee) ; Čavoj, Ondřej (advisor)
Thesis deals with description of passive and active methods of reducing automotive aerodynamic drag. Firstly is given theory of aerodynamics and its testing methods. Further, split by vehicle parts, passive aerodynamic components used in mass production and on research vehicles are described. Lastly, some components of active aerodynamic are given.
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Post-war automotive aerodynamics
Šmerda, Ondřej ; Vančura, Jan (referee) ; Čavoj, Ondřej (advisor)
This Bachelor thesis deals with charting the development of the automotive aerodynamics in the post-war period. It focuses on principles that go along with car design. The development is demonstrated by aerodynamically significant and unusual cars including racing and record cars. Last but not least, the work compares those cars with today's cars and describes drawbacks of the cars of the given period from today's perspective.
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Analysis of the influence of body position on the car's aerodynamic characteristics
Jirásek, Lukáš ; Svída, David (referee) ; Vančura, Jan (advisor)
Aim of this diploma thesis is to make sensitivity research concerning influence of vehicle body position on its aerodynamical loading. CAD model was created in Pro/E software. Formula Ford 1600 chassis and vehicle body dimensions were used as a pattern for CAD model. Then this model was imported into CFD environment where ambient medium characteristic were set up. FLUENT software performed calculations and measurement of aerodynamical characteristics of vehicle dependent on height and angle of chassis.
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