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Turbulent flow suppression in pipe
Jahn, Jiří ; Rudolf, Pavel (referee) ; Štigler, Jaroslav (advisor)
This thesis deals with ways to suppress turbulent flow in pipelines. In the first part various methods of laminarization are presented, when the turbulent flow is transformed into laminar flow, including the results of experiments published by the authors. The next part presents the results from CFD. The calculations were performed for one of the methods mentioned in the first part and the results were compared with each other. In addition, several options have been suggested to improve the original method.
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Study of heat transfer by turbulent flow in cold helium gas in experiment with Rayleigh-Bernard convection at ISI CAS in Brno
Balko, Marek ; Štigler, Jaroslav (referee) ; Macek, Michal (advisor)
The diploma thesis deals with the study of Rayleigh-Bénard convection for Rayleigh numbers in the range 1E8-1E14. The evaluated data come from an experiment with cryogenic helium in a cylindrical cell in a configuration with cell diameter D = 30 cm, height L = 30 cm and a second configuration with cell diameter D = 30 cm, height L = 15 cm. Miniature sensors recorded temperature fluctuations over time under various physical conditions and properties of helium. Using MATLAB software, the output parameters of the system (Nusselt and Reynolds numbers) and their dependence on the control parameters (Rayleigh and Prandtl numbers) were determined from the measured data. A new approach to the distribution of measured signals according to the direction of large scale circulation was used in the work, which leads to improved analysis. Reynolds numbers were evaluated using the so-called elliptic method. Furthermore, the work deals with the study of the coherent structure of the large scale circulation inside the cell.
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New concept of large-area irrigation systems
Pírková, Marcela ; Štigler, Jaroslav (referee) ; Fialová, Simona (advisor)
This diploma thesis is focused on a large-scale irrigation embedded in the urban landscape. The main goal is to find a new concept of the large-scale irrigation system using a minimum of added electrical energy. The system is aimed at rainwater harvesting and distribution in populated areas. Part of the work is the analysis of the zoning plan of the selected locality, the design of the entire system from the accumulation of collected water to the distribution of watering to the root zone of plants. In the practical part, the proposed distribution network is calculated according to the current known equations, and the calculation is finished with the choice of a suitable diameter of the pipeline network. In addition, the work suggests possible sites for new planting of plants.
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Design of System for Cleaning Pipes in Prefabricated Houses
Javorský, Samuel ; Řezníček, Svatopluk (referee) ; Štigler, Jaroslav (advisor)
The aim of submitted bachelor´s thesis is to design a rotary brusch cleaner for cleaning air ducts in prefabricated houses putting emphasis on ergonomic and esthetic innovations. After a careful technologic analysis of current market and practical knowledge, a sophisticated, compact and homy design was created. The innovation is an aluminium truss construction, which fixes the basic body of the machine and makes it easier for the worker to manipulate and furtherly storage spaces for working tools were also created. The results of this thesis bring a new perspective on the issue.
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Design of Air Purifier for Home Use
Kotenkova, Tatiana ; Sládek, Josef (referee) ; Štigler, Jaroslav (advisor)
The topic of this bachelor work is the design of an air purifier for home use. The main goal is to design an air purifier for the home, office or expectant environment and a suitable air purifying technology with an emphasis on ergonomic and aesthetic innovations. Is solving the problem of the optimal combination of modern technologies, ergonomic features and design for maximum efficiency of the air purifier's work and fulfillment of the aesthetic function in the daily use of the product. The resulting product responds all modern needs and expectations. The combination of the functions of disinfecting the air and the surfaces in the room, the variability of the location and transmission of the air purifier makes it potentially a demand for a wide audience of buyers.
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Particle separation from fluid flow
Fejta, Vojtěch ; Urban, Ondřej (referee) ; Štigler, Jaroslav (advisor)
This bachelor thesis deals with the particle separation from fluid flow. The aim of this thesis is to get acquainted with the already existing methods of separation, to study their principles and to describe devices designed for particle separation. The thesis is divided into two main units, the first explains the individual methods of separation, the second describes the specific particle separators, their advantages and disadvantages. The final part of the thesis is devoted to the design of another approach to separation.
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The pump in the turbine regime in the hydraulic circuit
Šimunek, Ondřej ; Štigler, Jaroslav (referee) ; Haluza, Miloslav (advisor)
This thesis is focused on finding an optimal working area of a pump running in a turbine mode and choosing a suitable pump from a company catalogue. Calculations of a water tower are accomplished based on basic equations of hydromechanics. The optimal working area of a pump running in turbine mode is determined with respect to maximum power. Based on the turbine characteristics is found the pump design point for which is chosen a mass-produced pump from a company catalogue.
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Portable water pico turbine design, production and basic parameters verifying
Tománek, Ladislav ; Haluza, Miloslav (referee) ; Štigler, Jaroslav (advisor)
The aim of this diploma thesis is to design, manufacture and measure the characteristics of a mobile water pico turbine. More precisely, it is an experimental construction of a mill wheel. The first part of this document is describing the design and manufacture of the turbine. This part focuses mainly on the construction of water wheels with different sizes of buckets and on the nozzle supplying water to the turbine. There is also a CFD simulation of pressure loss of nozzle. The second part of the thesis is focused on the processing of data that were measured in the laboratory, including the determination of uncertainties. The measurements were performed for different turbine settings such as flow, speed, different wheel shapes and different positions of the nozzle distributing water to the wheel. For individual turbine settings are created characteristics, from which maximum powers and maximum efficiencies parameters are determined.
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Fluid flow analysis in the open cylindrical container with the free surface vortex
Illík, Jakub ; Klas, Roman (referee) ; Štigler, Jaroslav (advisor)
This master's thesis analyses fluid flow in an open cylindrical tank with vortex using numerical simulation. The theoretical part introduces a set of equations governing fluid flow and relations used to describe vortex motion. A general overview of terms used in computational fluid dynamics is presented. The experimental section consists of three parts. The vortex modelling is performed using ANSYS Fluent software. Data are consequently analysed within ANSYS CFD-Post software tool. Special focus is put on the vortex shape that is fitted with a curve corresponding to a probability density function of the Cauchy distribution. Results are then plotted in MATLAB software.
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