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Vortex pump as a possible heart replacement
Coufalík, Martin ; Klas, Roman (referee) ; Klas, Roman (referee) ; Fialová, Simona (advisor)
The diploma thesis deals with the issue of artificial hearts and ventricular assist devices. The theoretical part describes the heart and its function. Blood is characterized in terms of rheological behavior and the possible criteria for hemolysis are discussed. The following section describes the most commonly used ventricular assist devices, with emphasis on the use of the regenerative pump, including its components. In the practical part, an experimental analysis of two pumps (COV 43 and COV 23) is performed. Furthermore, non-dimensional characteristics of the pumps are constructed using the laws of similarity. In the computational part, the CFD analysis of the regenerative pump is performed by means of stationary and transient calculation. The results are compared with the experimental findings and based on the results, the impeller of regenerative pump was modified.
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Optimized design of turbine engine intake
Kubo, Michal ; Matějů, Jiří (referee) ; Popela, Robert (advisor)
This master thesis deals with design of a subsonic intake which is used to supply small jet engine integrate into the fuselage of agile small unmanned aerial vehicle (UAV). Some kinds of these intakes are listed in order to inspire and introduce future designers into this part of jet plane design. This thesis contains a small amount of theory about compressible flow, and necessary knowledge which are important to know before the very first attempt to design an intake. Two models were designed in order to prove that the theory listed in this thesis is useful and can be used as a guide in design process of subsonic intakes. Both designs have the same layout. S-duct design with one intake placed on the belly of fuselage was chosen. After CFD analysis of first model it was found that there are huge area with separated flow and vortex. Separated flow leads to big total pressure loss and pressure distortion. While designing the second model the emphasis was to avoid this vortex and improve flow conditions. This optimization was success and the second design have smaller pressure loss in compare to the first design. The difference is more than 50% at fly speed M=0,8.
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Design of Throttle body for SI engine
Jantač, František ; Bazala, Jiří (referee) ; Beran, Martin (advisor)
This master’s thesis deals with the design of the throttle body of the intake manifold of a spark-ignition engine with regards to minimizing throttle loses at full engine load. The first part of this thesis focuses on the elements of intake tract structure on contemporary combustion engine including their design solutions and the theory of flow. The thesis also describes the creation of the 3-D CAD model of intake manifold with a throttle body and the description of the CFD flow simulation with the evaluation of resul.
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Volumetric losses
Feldová, Petra ; Sluše, Jan (referee) ; Klas, Roman (advisor)
The main goal of this bachelor thesis is to evaluate the flow of sealing gaps and assess the impact of the expansion chambers of various shapes , placing them in order to reduce volumetric losses . The first section summarizes theoretical knowledge of pumps, which suffer the most from these losses. There are also described the analytic solutions of flow in the cracks and possible use of simulation programs, such as Fluent, for investigation of more difficult tasks. The computational part compares analytically determined values of the volume flow for smooth gap, with the values obtained from the program Fluent. Thanks to the values from this program is also possible to assess the effect of rotation on the flows. Analytical relationships do not include this impact . For easier comparison the flow in the expansion chambers are further drawn contours of the static pressure, velocity vectors and pathlines in their cross-section.
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Vane pump
Poul, Josef ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This bachelor’s thesis talks about the problems of pumps, especially vane pumps. After research part, there are given some basic relations for the design of the pump. Then there is calculation of the basic dimensions according to the given parameters. In conslusion, the designed shape is subjected to the CFD analysis.
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Optimization of the siphon swirl turbine draft tube
Mach, Jiří ; Haluza, Miloslav (referee) ; Rudolf, Pavel (advisor)
The goal of this diploma thesis is to design a new shape of the draft tube, which will be easier to manufacture while maintaining good strength and hydraulic properties. First part of this thesis is devoted to the formulation of the problem, description of the swirl turbine, principle of operation, the basic variants of arrangement, also the function of the draft tube, its efficiency and other formulas. In the second part of this thesis is a CFD and strength analysis of the original design, also a new design is proposed and the possibility of optimization using ANSYS Fluent Adjoint solver.
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Design of heat exchanger
Buzík, Jiří ; Lošák, Pavel (referee) ; Nekvasil, Richard (advisor)
The master thesis deals with thermal hydraulic design and strength design of a heat exchanger with “U” tube bundle inside of a shell. The first chapter introduces general design issues of the heat exchangers. The following chapter describes thermal hydraulic design created in software Maple 16.0 by using Kern’s method and the method of Bell-Delaware. HTRI software was used for the control of thermal hydraulic design correctness. To check critical locations of fluid flow in space between the tubes, the CFD model was created at ANSYS Fluent 14.0 software. Accuracy of strength design was verifying by Sant’ Ambrogio software in accordance with ČSN EN 13 445 standards. The last chapter concerns with FEM analysis. According to standards ČSN EN 13 445 the design by analysis namely method based on stress categories were used for the strength analysis of nozzle.
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Optimalization of Intake Manifold for SI Engine
Vondráček, Václav ; Vančura, Jan (referee) ; Beran, Martin (advisor)
The main aim of this diploma thesis is to design two different types of air throttles in the intake manifold and compare their influence on a loss of dynamics of the flow of drawn air. The main purpose is to compare the mass flow for wholly opened air throttle. It deals with creating CDF model of intake manifold by using 3D scanner Atos and software Pro/Engineer WF5. During the work, the results of the CFD analysis were used for a real testing.
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Vane pump
Mach, Jiří ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This work gives basic information about vane pumps, especially with unbalanced construction and vanes led by rotor. The first chapter generally gives an attention to pumps. There are described basic information, classification, advantages and disadvantages of the types, characteristics and calculation relations. The following chapters describe the vane pumps in the way of classification, description of function and calculation relations. There is also made a practical calculation of vane pump according to the assignment accompanied by CFD analysis.
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Numerická simulace procesu termosanace stavebních konstrukcí
Kučera, Martin
This bachelor's thesis deals with the numeric simulation of hot-air treatment of wooden elements of roof truss constructions. The thesis is divided into two main parts. In the first, theoretical part, analyses of an air-flow in the area of treated construction and a heat transfer from a pre-heated air to the wooden construction are elaborated. Necessary theoretical background - laws of convection and heat transfer are listed. The second part of this thesis consists of simulations of hot-air wood treatment in particular applications. Appropriate 2D and 3D models of given situations were created and used as inputs for the finite element method analyses. Gained results are graphical depiction of the velocity of air-flow surrounding the treated elements, temperature distribution in their surrounding and cross-section of the elements itself. In order to derive the required time of the treatment process, temperatures in appropriately chosen points have been measured.
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