|
|
Influence of nozzle angle on gas pressure distribution in the nozzle according to Prandtl's theory
Dostalová, Petra ; Maxa, Jiří (referee) ; Šabacká, Pavla (advisor)
The thesis is focused on issue pressure distribution in the nozzle while pumping the differential pumped chambre of an environmental scanning microcope. The main task of the thesis is to find suitable design of this nozzle respect to Prandtl`s theory. In the theoretical part, there are presented microscopy as science. Afterwards the thesis is focused on environmental scanning electron microscopy and its problem and vacuum system, computer program used for preparation of simulation and study that the experimental part is based on. The experimental part evaluates the results of physical-mathematical analysis of the flow inside and behind the Laval nozzle in the experimental chambre. The results are the basis for the optimal proportions of this nozzle.
|
|
|
Propelling nozzles of turbofan engines
Milko, Michal ; Janhuba, Luboš (referee) ; Šplíchal, Miroslav (advisor)
The thesis describes the work principle of propelling nozzles of two-stream engine in terms of thermodynamics and also describes common design solutions which are used at most types of turbofan engines. Thesis also describes the advantages and disadvantages of each adjustments and trends in development of propelling nozzles.
|
|
|
Design adjustment of vacuum ejector assembly for medical application
Boháč, Petr ; Štefan, David (referee) ; Návrat, Tomáš (advisor)
This bachelor's thesis deals with the design of a two-stage suction ejector for medical use with the working name Medieject II. The proposed modifications are to achieve a reduction in the value of the created vacuum compared to the original value, and thus also enable a more precise regulation of the created vacuum. The first part of the thesis presents the theoretical assumptions, functions and requirements for a multistage suction ejector, which is to serve in a medical environment. The second part describes the analytical calculation of the original variant, which serves as a partial check of subsequent numerical simulations. The third part deals with CFD simulations, which are used as the main solving method for adjustments. Using flow simulations two design modifications and their several partial variants are proposed. Then these modifications are supported by experiment. The second design proposal will be used to manufacture equipment that will fulfill the requirements.
|
|
|
Tesla Bladeless Turbine
Lokaj, Jakub ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The diploma thesis describes design of bladeless machine known as a Tesla turbine. The work is divided into theoretical part, practical part involving the design and experimental measurements of made bladeless turbine and a final assessment of thesis. The theoretical part deals with the basic design features of bladeless machines and their design modifications and flow in the nozzles. Furthermore there is a dedicated part of the dynamics of working fluid in the rotor of bladeless turbine represented by CFD modeling. The practical part includes the design and construction of parts of the turbine on a preliminary calculation using an analytical model of the flow in the turbine. The designed turbine components were checked for operational safety with structural calculations of shaft and disk impeller. The thesis was also performed experimental measuring of parameters of designed bladeless turbine. Measured values were compared with the analytical model which predicted turbine efficiency. In conclusion, besides to assessment, thesis also outlines possible proposals for further improvements of constructed bladeless turbine.
|
|
|
Influence of nozzle angle on gas pressure distribution in the nozzle according to Prandtl's theory
Dostalová, Petra ; Maxa, Jiří (referee) ; Šabacká, Pavla (advisor)
The thesis is focused on issue pressure distribution in the nozzle while pumping the differential pumped chambre of an environmental scanning microcope. The main task of the thesis is to find suitable design of this nozzle respect to Prandtl`s theory. In the theoretical part, there are presented microscopy as science. Afterwards the thesis is focused on environmental scanning electron microscopy and its problem and vacuum system, computer program used for preparation of simulation and study that the experimental part is based on. The experimental part evaluates the results of physical-mathematical analysis of the flow inside and behind the Laval nozzle in the experimental chambre. The results are the basis for the optimal proportions of this nozzle.
|
|
|
Design adjustment of vacuum ejector assembly for medical application
Boháč, Petr ; Štefan, David (referee) ; Návrat, Tomáš (advisor)
This bachelor's thesis deals with the design of a two-stage suction ejector for medical use with the working name Medieject II. The proposed modifications are to achieve a reduction in the value of the created vacuum compared to the original value, and thus also enable a more precise regulation of the created vacuum. The first part of the thesis presents the theoretical assumptions, functions and requirements for a multistage suction ejector, which is to serve in a medical environment. The second part describes the analytical calculation of the original variant, which serves as a partial check of subsequent numerical simulations. The third part deals with CFD simulations, which are used as the main solving method for adjustments. Using flow simulations two design modifications and their several partial variants are proposed. Then these modifications are supported by experiment. The second design proposal will be used to manufacture equipment that will fulfill the requirements.
|
|
|
Tesla Bladeless Turbine
Lokaj, Jakub ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The diploma thesis describes design of bladeless machine known as a Tesla turbine. The work is divided into theoretical part, practical part involving the design and experimental measurements of made bladeless turbine and a final assessment of thesis. The theoretical part deals with the basic design features of bladeless machines and their design modifications and flow in the nozzles. Furthermore there is a dedicated part of the dynamics of working fluid in the rotor of bladeless turbine represented by CFD modeling. The practical part includes the design and construction of parts of the turbine on a preliminary calculation using an analytical model of the flow in the turbine. The designed turbine components were checked for operational safety with structural calculations of shaft and disk impeller. The thesis was also performed experimental measuring of parameters of designed bladeless turbine. Measured values were compared with the analytical model which predicted turbine efficiency. In conclusion, besides to assessment, thesis also outlines possible proposals for further improvements of constructed bladeless turbine.
|
|
|
Propelling nozzles of turbofan engines
Milko, Michal ; Janhuba, Luboš (referee) ; Šplíchal, Miroslav (advisor)
The thesis describes the work principle of propelling nozzles of two-stream engine in terms of thermodynamics and also describes common design solutions which are used at most types of turbofan engines. Thesis also describes the advantages and disadvantages of each adjustments and trends in development of propelling nozzles.
|
guest ::
