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Cavitation heater
Rovder, Juraj ; Závorka, Dalibor (referee) ; Rudolf, Pavel (advisor)
This report is considering an equipment that is using cavitation to heat water. The theoretical part explains basic principles of its function and different types of such device. Following chapters describe a construction of used heater and an experiment carried out on this device. The results of the experiment are collected and evaluated. The final part of the thesis contains suggested adjustments of the given cavitation heater.
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Rocket fuel pumps
Kalina, Adam ; Sluše, Jan (referee) ; Rudolf, Pavel (advisor)
This bachelor thesis deals with the pumps used in rocket technology, their operating parameters and general geometry. Particular attention is paid to inducers. Their influence on cavitation in pumps and overview of the different types that are used in various rocket engines. Is mentioned here how cavitation is created, what are the types of cavitation and its impact on the operation of the pump.
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Elimination of nanoplastics by cavitation and advanced oxidation processes
Kluknavská, Júlia ; Burda, Radim (referee) ; Rudolf, Pavel (advisor)
Táto práca sa zaoberá znečistením životného prostredia mikro a nanoplastami a ich možnou likvidáciou. Práca pozostáva z rešeršnej a experimentálnej časti. V rámci rešerše je opísaná problematika mikro a nanoplatov z hľadiska ich vzniku, disperzie do životného prostredia a živých organizmov. V závere rešeršnej časti sú opísané súčasné možnosti eliminácie mikro a nanoplastov pri čistení odpadových vôd. Súčasné riešenia sú založené prevažne na filtrácii, ktorá však zo svojej podstaty nemôže byť absolútna. Bol vyslovený predpoklad, že pomocou zariadenia CaviPlasma by bolo možné eliminovať mikro a nanoplasty z odpadových vôd. Cieľom práce bolo experimentálne overiť tento predpoklad. Skúšobnou vzorkou bola suspenzia vody a polyamidových častíc, ktorá bola následne vystavená pôsobeniu kavitácie a plazmového výboja. Pri experimente nedošlo ku zničeniu častíc a ani ich k viditeľnému porušeniu. Ukázalo sa však, že plazmový výboj môže iniciovať zhlukovanie sa častíc až do takej miery, že sú pozorovateľné kontinuálne štruktúry mikroplastov. Tento jav by mohol byť potenciálne prospešný pri zachytávaní mikročastíc filtráciou.
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Hydroelastic Response of Hydrofoil Under Cavitation Conditions
Čupr, Pavel ; Koňas, Petr (referee) ; Veselý, Jindřich (referee) ; Rudolf, Pavel (advisor)
Tato disertační práce se zabývá experimentálním a výpočtovým výzkumem přídavných účinků od proudu kapaliny na obtékaný hydraulický profil. Dynamická odezva profilu byla analyzována pro dva typy buzení: buzení odtržením mezní vrstvy a Kármánových vírů a dále buzení pomocí externího budiče připojeného k lopatce. Experimentální měření dynamické odezvy profilu na oba typy buzení bylo provedeno pro lopatku umístěnou v kavitujícím a nekavitujícím proudění. Získané výsledky byly použity pro verifikaci přídavných účinků stanovených s využitím numerického modelování.
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Dirt Bike Suspension Construction
Kučera, Vlastimil ; Prokop, Aleš (referee) ; Janoušek, Michal (advisor)
Front suspension significantly influences the characteristics of the motorcycle, so it is necessary to deal with the problem. The bachelor thesis presents individual suspension functions, it describes and explains function of air spring and coil spring forks, analyzes the damping system and shows the options for settings of the forks. It compares the design of the forks used in production motocross motorcycles from 2016 and 2017 and refers to their potential advantages or disadvantages. The forks d iffer from each other mainly by the type of spring, and whether each leg contains spring and damper or they have a separate function. Each solution has its advantages and disadvantages, it depends mainly on the overall setting of the fork.
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Adapter for pressing of sport shockabsorber
Drozd, David ; Jeniš, Filip (referee) ; Mazůrek, Ivan (advisor)
This bachelor thesis is aimed at developing an adapter intended for filling mono-tube shock absorbers with gas. The first part deals with fundamentals and methods of gas charging of shock absorbers. The second part is aimed at designing the adapter based on findings from the first part. The third part includes detailed description of the final design and control calculations. Thesis outcomes include complete technical documentation of filling adapter of custom design and a comprehensive research report concerning gas charging of shock absorbers.
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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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Eliminator of dental calculus
Šobich, Adam ; Sekora, Jiří (referee) ; Rozman, Jiří (advisor)
Bachelor’s thesis is focused on system design of eliminator of dental calculus operating at a frequency of 27 kHz and reaching the intensity of ultrasound on the applicator tip to 5 W/cm2. The work analyzes problems of dental calculus, principle of ultrasonic waves and the physical phenomena occurring in the environment, which it passes. Another part of the work describes the creation of waves using ultrasonic transducer and the amplification of ultrasound in the waveguide. Practical part of work is presented by functional diagram, which describes the sequence and function of the main parts of the device. The Bachelor’s thesis presents individual steps for design of applicator and the circuit for eliminator of dental calculus, including calculations and diagrams. The resulting circuit is experimentally verified and supplemented with draft of the printed circuit board.
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Vortex rope for overload operation of Francis turbine
Kozák, Jiří ; Štefan, David (referee) ; Rudolf, Pavel (advisor)
This master's thesis deals with CFD simulation of vortex rope in the elbow draft tube for overload operation of Francis turbine. The main objective of the thesis is to compare results of the CFD simulations of the original elbow draft tube with a derived straight cone draft tube considering volume and the shape of the cavitation region and dynamic flow characteristic. Results of the 3D simulations are also compared with axi-symmetric simulations, which reduce demands for computing time and power.
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