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Dynamic radial force on centrifugal pump impeller
Nováková, Naděžda ; Hudec, Martin (referee) ; Habán, Vladimír (advisor)
This thesis deals with the radial forces acting on the impeller of a centrifugal pump. It focuses on the centrifugal pump type BETA 26. It addresses forces acting on the pump shaft. These forces are converted into the impeller. The most extensive part of this thesis is devoted to the experimental measurement and evaluation. The results are summarized and processed graphically.
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Experimental testing of hydrocyclone
Juráš, Filip ; Hudec, Martin (referee) ; Rudolf, Pavel (advisor)
This bachelor thesis is focused on experimental testing of hydrocyclone. The work is divided into two parts. The first part describes basic parts of hydrocyclone, dimensions, and operating parameters of the tested hydrocyclone and principles of its work. The second, practical part, describes the general preparation of the experiment, which started with searching for a suitable material and continued to the filter device used for particle separation.
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Cavitation assessment from flow rate drop and high-frequency pressure pulsations.
Šebek, Miloš ; Hudec, Martin (referee) ; Habán, Vladimír (advisor)
Main issue of this master´s thesis deals with high-frequency pulsations caused by cavitating hydraulic components (in this case nozzle and throttle valve). In first measurement on the nozzle was not a high-frequency sensor set in the way, so the evaluation was incorrect. After re-setting of the way was the nozzle measured again and the pulsations were evaluated correct this time. During the last measurement was the sensor located behind the throttle valve, which was with gradual opening and cavitation treatment measured. Resulting dependencies worked out on time dependence. A special mathematical method, Fourier transformation, was used. It transformed pressure amplitudes into frequency dependence. Evaluation of dependecies is the basic step for frequency band assesment, in which the cavitation on particular components happens.
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Cavitation in engineering praktice
Kianička, Martin ; Hudec, Martin (referee) ; Pochylý, František (advisor)
This diploma thesis contains three parts. The first part is a background research which deals with notions such as cavitation and cyanobacteria. It also contains current phase in the use of cavitation. The second part deals with design, composition and constructional solution of hydraulic circuit on the riverboat. The third part deals with experimental certification of the cavitation effect on the cyanobacteria in the water. Design of the riverboat with the hydraulic circuit including the circuit itself and the cavitation tube was created in SolidWorks program, calculations, it’s processing and graphs were created in Microsoft Excel.
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Design of stand for atmospheric resistors testing
Kerek, Milan ; Hudec, Martin (referee) ; Houška, Pavel (advisor)
This master’s thesis deals with the design and manufacture of device for testing and verification of functionality of atmospheric resistors produced by IMI CCI Czech Republic. An atmospheric resistor, also called disk stack, is a stack of disks through which the medium flows and the system of labyrinths in disk stack causing a pressure reduction of medium. This thesis describe design of the mechanical parts of stand for atmospheric resistors, choice pneumatic circuit’s components, data acquisition hardware for measuring flow, inlet and outlet pressure, and temperature. The software was created in LabVIEW programming environment. In the end of this paper was done measurement in order to test functionality of test stand and software.
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The Fluid Flow Between Two Paralel Plates, the Comparison Between the Measruring and The Analytical Solution.
Kárník, Jan ; Hudec, Martin (referee) ; Štigler, Jaroslav (advisor)
This master's thesis is focused on measurement of the velocity profiles in liquids using ultrasound. The thesis describes two executed measurements both in the channel with free surface, both in the square shaped pipe. In the introductory part this work deals with clarifying the theoretical fundamentals associated with the measurement method UVP such as the Doppler effect, the speed of sound in the medium or the acoustic impedance of the environment. The next part describes the execution of the velocity profile measurement in the channel with free surface described and there is also the description of the results achieved during this measurement. In the last part the thesis deals with the measurement of the velocity profile in the square shaped pipe. There is also the comparison between the measured velocity profiles and the velocity profiles calculated using the analytical formula. In the conclusion there is the evaluation of achieved results.
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Modification of the experimental stand for cavitation erosion testing
Spielmann, Šimon ; Hudec, Martin (referee) ; Rudolf, Pavel (advisor)
This bachelor´s thesis is focused on cavitation erosion and modification of experimental stend used for cavitation testing. The thesis is divided into two main parts, theoretical and proposal part. In theoretical part, cavitation effect, occurrence of cavitation, growth and collapse of cavitation bubble is analysed. The theoretical part also focused on negative effects of cavitation impact on material´s surface and types of cavitation erosion testing are discussed. The proposal part is focused on the new proposal of cavitation testing apparatus. The old apparatus and the new proposal of apparatus is described together with description of the cavitation test. The new cavitation apparatus will be used for testing cavitation erosion resistance of material or next research of cavitation phenomenon.
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Adaptation of historical technical facility on the small hydroelectric power
Čermáková, Klára ; Sluše, Jan (referee) ; Hudec, Martin (advisor)
Small hydroelectric power stations are the topic of this bachelor thesis which can be divided into three parts. The first one describes a history of utilising water energy, elementary types of hydropower projects, and classification of hydroelectric power stations. The second part is focused on small hydroelectric power stations. Finally the acquired knowledge is used in the last part describing the proposal of an adaptation of the water mill in Lomy to a small hydroelectric power station.
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Study of in-take vortices
Burda, Radim ; Štigler, Jaroslav (referee) ; Hudec, Martin (advisor)
This bachelor thesis deals with vortex flow, in particular intake-vortices formations with emphasis on intake-vortices with full air core which appear near vertical intakes. The thesis is divided into two parts. The first part contains theoretical research on the intake-vortices and maps development of this field during the last 60 years. The goal of the experimental part is to verify recommended dependence of the formation of intake-vortices with full air core on submerge of intake and volumetric flow rate. The experiment was conducted in the laboratory of the fluid engineering department of Viktor Kaplan.
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