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High-speed Condesing Steam Turbine
Klíma, Petr ; Trojan, Aleš (referee) ; Fiedler, Jan (advisor)
ith one controlled extraction and one uncontrolled extraction, calculation of the flow channel at all stage, design and calculation of the regulation valve and create connection diagram of steam turbine and air cooled condenser. At the beginning of this work is an overview of manufacturers of steam turbines and their unified products. Master thesis was developer with G-Team, a.s. as using calculations and the instructions given in the recommended literature with supporting CFD simulations to determine the loss coefficients and FEA simulations to determine the eigenfrequencies blades.
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Influence of the Francis turbine stay vane trailing edge shape on generation of Karman vortex street
Novotný, Vojtěch ; Skoták, Aleš (referee) ; Rudolf, Pavel (advisor)
In the flow past bluff bodies for a certain range of velocity a periodical vortex shedding emerges which is known as von Kármán vortex street. This phenomenon causes the periodical alteration of pressure field which affects the body. Should the vortex shedding frequency be similar to the body natural frequency, the amplitude of vibration significantly increases which can lead to fatigue cracking. In the case of water turbines, this phenomenon often affects the stay vanes. Both the vortex shedding frequency and the lift force amplitude can be influenced by the modification of the trailing edge geometry. The aim of this thesis is to use CFD computation in order to find the optimal geometry of the stay vane trailing edge for the specific Francis turbine unit.
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Fluid coupling
Vavrla, Zdenek ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This diploma´s thesis deals in the first part with hydrodynamic coupling, mainly on her construction and function description. In the second part of this diploma´s thesis is solved influence construction changes of the hydrodynamic coupling to the transmitted torque. Changes in the construction are determined by changing the number of blades and changing the value gap between the turbine and pump round. Finally, construction change is solved of the hydrodynamic coupling to increase the transmitted torque and force effects are evaluated on the hydrodynamic coupling.
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Assessment of thermal comfort in a low-energy family house with warm-air heating
Kos, Jan ; Forman, Matěj (referee) ; Jaroš, Michal (advisor)
The task of this master´s thesis is an evaluation of warm-air heating system in a low energy family house from the viewpoint of thermal comfort during winter season. The CFD simulation using CCM+ code was used for this purpose. The environment parameters in the central living room were evaluated for two variants – with underfloor heating and without it. The thermal comfort was evaluated using indices according ČSN EN ISO 7730 standard.
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Ventilation of classrooms at school
Kadlček, Ondřej ; Blasinski, Petr (referee) ; Uher, Pavel (advisor)
This master’s thesis deals with CFD simulation of air flow in a primary school classroom. The aim of the simulation is to evaluate the results of the proposed solution and the created other variants of air distribution with the evaluation of the proposed measures and solutions. Part of the master’s thesis is the design of elementary school ventilation systems at the level of implementation documentation.
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Race car bonnet shape design based on flow analysis
Šnajdr, Petr ; Kvarda, Daniel (referee) ; Michalec, Michal (advisor)
The bachelor’s thesis deals with reducing aerodynamic drag of a pneumobile. The thesis summarizes knowledge in the field of vehicle aerodynamics and the principle of CFD simulations. The essence of the work is bonnet shape design of racing pneumobile Typhoon, developed at FME BUT, for lowest possible air resistance. CFD simulations are used to observe and analyse the influence of the bonnet shape on the aerodynamics properties. The designed shape solution of the bonnet significantly contributes to the reduction of aerodynamic drag compared to the existing bonnet. Thanks to this, the vehicle’s parameters are improved from maximum speed to the range. The acquired knowledge can also help in the further development of pneumobiles and in improving the setting of the computational model described in the work.
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Design of test equipment for testing air-cooled steam condensers
Líška, Filip ; Chýlek, Radomír (referee) ; Kracík, Petr (advisor)
The work is focused on the design of a testing device for testing air-cooled condenser tubes. At the beginning of work are described basic types of industrial air condensers, possibilities of tube types and their materials. A radial fan that will supply cooling air to the wind tunnel is already purchased for the testing device. For minimum and maximum parameters, the basic geometry and state parameters are first proposed. Subsequently, the basic design was tested in the CFD. The result of the first model was not satisfying because the speed field has not been evenly changed to a straight tunnel. For these conditions, several variants have been tested in the second model, and the "blow" on the tubes inside the wind tunnel has been tested for the best variant.
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Ventilation of the archive
Hudeček, František ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
Ventilation systems for depositories have certain specifics. Their main objective is to provide safe environment for preserving unique cultural or other valuable objects that are being stored for extensive time periods. The economical aspect of the operation should be taken into ac-count and the ventilation system adjusted accordingly. This project also incorporates ventila-tion of secondary areas. Ventilation system is subsequently assessed in terms of indoor air quality (CFD simulation) and energetic requirements (program TRNSYS). Air quality in depositories is evaluated using age of air parameter. The qualitative and quanti-tative outcomes are obtained. Possible measures are then suggested to improve the air quality. The objective of energy simulation is to evaluate overall energy required for a year of opera-tion of main air handling units. In addition, estimation of energy requirements for heating and cooling are made for the whole building. The results are compared and more simulations are carried out in order to lower overall energy consumption.
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CFD Simulation of Turbocharger Regulating Mechanism
Drdla, Adam ; Vančura, Jan (referee) ; Svída, David (advisor)
The aim of this thesis is to provide research into turbocharger regulation, and analyze the force load of vanes in the VNT mechanism of Garrett turbocharger by CFD simulation. In the thesis there is one model with two different mesh densities. It describes the relevance of supercharging vehicle engines and the kinds of supercharging aggregates in the introduction. Then, the thesis is divided into two chapters. The first chapter provides research, describing primary principle of supercharging, turbocharger construction and kinds of air regulation. The practical part of the thesis solves the force load of VNT mechanisms. It was necessary to optimalize the 3D Garrett turbocharger model, create two meshes with different element densities, specify boundary conditions and analyse the results of both cases. A general description of solved problems, comparison of results of force load vanes and propose simplifying and verifying the CFD calculation are included in the conclusion.
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OPTIMIZATION OF WELLNESS AIR CONDITION
Kysilka, Michal ; Zubíček, Vojtěch (referee) ; Šikula, Ondřej (advisor)
The theme of diploma thesis is a design optimization of air distribution in swimming-pool hall with regard to free water surface evaporation. This problem was solved according to determined criterions with the aid of CFD simulation. Experimental measurement part of the thesis deals with evaporation problems where own formula for this physical phenomenon is determined. This formula is compared with already known algorithms. Author suggests that such formula might be integrated in CFD software.
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