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Ventilation calculations in synchronous machine
Judas, Jan ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
The aim of the project was to get familiar with the environment of ANSYS CFX, create several models of fans and synchronous machine model in Autodesk inventor, create model of cooling medium flow through the machine with these fans and evaluation of results. Firstly the thesis describes the synchronous machine itself, losses of the machine, the flow of power of synchronous machine and methods of its cooling. Next the thesis describes each kind of heat transfer, laminar and turbulent flow. The thesis also refers of kind of the fans and the program used to calculate the flow Ansys CFX, including the method that Ansys used to calculate. The work describes the individual modification of fans and setting of calculation in ANSYS. Then displays the results of the analysis these fans for different numbers of fan blades and for modification of the fan. Then the thesis analyzes selected modifications due to changing speed. In the last chapter shows the analysis of flow in the machine with three different fans. In particular, there is shown the mass flow rate, pressure and its distribution on areas for evaluation.
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Calculation of the cooling medium in the asynchronous
Trnka, Zbyněk ; Skalka, Miroslav (referee) ; Janda, Marcel (advisor)
The aim of this master´s thesis was to model the fan for the induction motor, and then to solve this model using Ansys CFX in the terms of flow, when considering the different speeds of rotation of the rotor. The introduction of this work is dedicated to basic terms and definitions from spheres of fluid flow, cooling of the electrical machines, especially to the cooling of the asynchronous machine. There is also attention paid to losses in this machine. Finally, there is modeled radial fan and an air gap of specified induction machine. By using Ansys CFX the flow, which passes from the fan into the air gap, is analyzed.
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Modeling of flow on synchronous generator
Chlup, Jaroslav ; Skalka, Miroslav (referee) ; Janda, Marcel (advisor)
This project deals with simulation´s possibilities of air flow in electric machines. A finite element method is the final element technique. Aim of this project is conversion universal formula for calculation friction dissipation factor. For its location is necessary to create 27 simulations according to the 2. plan order. Usage programme MATLAB for processing results obtain requisite algorithm for calculation friction dissipation factor.
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Modelling of air flow in combustion chamber ZKG
Krišpín, Jan ; Lisý, Martin (referee) ; Špiláček, Michal (advisor)
The subject of the submitted bachelor thesis is a description of chemical and physical behavior of biomass, methods of energetic transformation of biomass, processes in a combustion chamber during burning and primarily flowing of combustion air. A part of this thesis is a modelling of an air flow in the combustion chamber using the finite elements method with an evaluation and a suggestion of construction changes of the combustion chamber.
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Ejectors, its design and utilization
Dohnal, Jiří ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
This bachelor’s thesis deals with the area of ejectors. These machines are included in a group of a jet pumps, introduced in the first part of thesis. In the next part is an introduction of ejectors, their principal, characteristic, its design and function and differences of using gas and liquid in different combinations of driving or drifting medium. The most extensive part is about utilization in industry, medical care and other parts of life. In concluding part are some equations and laws using in design of ejectors. The biggest problem is their efficiency.
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Aircraft windshield blowing: solution and design possibilities
Šamša, Petr ; Fišer, Jan (referee) ; Jícha, Miroslav (advisor)
My thesis is considering with aircraft windshield blowing for airplanes designed according to CS-23 regulation. The first part introduces the size of precipitation clearing area in connection with CS-23 regulation and report SAE AIR805C. Next chapter describes a few possible design solutions which can be potentially used for windshield precipitation. There are also other methods analysed in that part. There are not only the casual systems like windshield wipers but some more rare or new technologies too. It can be some fluid repellent surfaces or blowers in that category. The third part deals with jet blast system in detail. There will be a design calculation for airflow conditions which are important for the correct function. The last quarter of this thesis mentions the experiment what should compare the theoretical computations from the third part with the real values.
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Noise and vibrations in air-conditioning systems
Libřický, Stanislav ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
This bachelor’s thesis is focused on the sources of noise in air-conditioning equipment and potential noise reduction. The thesis also includes a detailed list of the sources of noise. Thoroughly describes only the main ones, which the fans, aerodynamic noise of air conduit and chillers. The thesis continues with description of methods of the reduction of selected causes of noise in a certain environment. The final part of the bachelor’s thesis includes listing and description of laws and regulations affecting issue of noise in air-conditioning equipment.
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Ejectors and it's utilization in industry
Zejda, Vojtěch ; Hájek, Jiří (referee) ; Vondál, Jiří (advisor)
This work aims at introducing ejector pumps. It describes the working principle, advantages and disadvantages and restrictions of their usage in various applications. Main disadvantage of ejectors is the low efficiency which limits the usage only in specific applications where it is not considered to be a crucial factor. Therefore, examples of usage of various ejectors in industrial processes are listed further. Last but not least, in these examples are also demonstrated difficulties and reasons why it is favourable to use an ejector rather than other types of pumps. Further off, this work deals with design methods of ejectors and compares their suitability. It appears that not all the methods are suitable for ejector design, because it depends greatly on presumed shape of a certain ejector. In the end, there is compared energy intensity of an ejectors and common centrifugal pumps and confirms energy disadvantage of ejectors.
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Aerodynamic components of Formula 1 vehicles
Mazáč, Petr ; Beran, Martin (referee) ; Vančura, Jan (advisor)
This bachelor’s thesis deals with research themed aerodynamic components of Formula 1 vehicles. The beginning of the thesis is focused on basic of aerodynamic and generating downforce. Afterwards it deals with developement of aerodynamic from the beginning of Formula 1 to the present time, followed by categorization of the various aerodynamic elements which were used on vehicles throughout the history of the sport and in the present time with their construction description. It also summarizes active aerodynamic components.
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Aerodynamic Wind Tunnels in the Automotive
Hromada, Martin ; Zháňal, Lubor (referee) ; Vančura, Jan (advisor)
The aim of bachelor thesis is research themed the aerodynamics wind tunnels in the automotive. Thesis contains overview of historical evolution of wind tunnels and their categorization. Following chapter describes main parts of wind tunnel, ways of measurement in wind tunnels and problems during testing.
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