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Hydraulic losses in pipes
Štefan, David ; Kubálek, Jiří (referee) ; Rudolf, Pavel (advisor)
The work deals with the effect of friction losses in pipes. Calculation of specific energy losses using the Darcy-Waisbach relationship. Calculation of friction coefficient in all areas of turbulent flow using the relations available, their comparison on the basis of average absolute deviations of calculated values from the values of Nikuradse chart. The result is the most accurate relations recommendations for the calculation of in different regions, graphic depiction of relations in Nikuradse diagram and evaluation of their performance.
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Pump storage station
Šimek, Petr ; Sloupenský, Zdeněk (referee) ; Kubálek, Jiří (advisor)
This bachelor thesis deals with the functions of hydro-power plants, describes the various machinery and their distribution according to the parameters of use. Outlines the calculation in the design of hydraulic machines. There are also descriptions of machine layout and their use in praktice. For the particular case, there is prepared hydro power plant Dlouhé stráně. Related topic that is included here, the electricity system and the daily load diagram.
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High Frequency Pulsation of Water Turbine in Operation
Kubálek, Jiří ; Kozubková, Milada (referee) ; Hružík, Lumír (referee) ; Haluza, Miloslav (advisor)
This thesis is concentrated on mathematical modeling of high frequency pulsations in pump turbines, which are the source of high-cycle continuous stress of the spiral casing cover, wicket gates and runner. There are proposed the solutions using the transfer matrix for the tube with a constant and conical cross-section. The paper compares variations of cylindrical and conical tubes, changes in boundary conditions. There are the models of PSPP Dlouhé Stráně made only of cylindrical tubes comparing to the model with cylindrical and conical tubes
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Design study of sinus pump
Havlát, Pavel ; Kubálek, Jiří (referee) ; Pochylý, František (advisor)
This dissertation focuses on the construction design of a sine pump. It particularly deals with loss minimisation and strives to solve problems relating to excessive wear of the scrapergate which separates suction and the delivery space. The first part of the dissertation describes a new construction variation of a sine pump and the second part deals with a more detailed study including optimisation of one variation.
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High-Frequency Pulsations Modeling
Střecha, Ludvík ; Kubálek, Jiří (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with the mathematical modeling of high-frequency pressure pulsations in water turbines. Pulsations are caused by the interaction between stator a rotor blades. These high-frequency pressure pulsations then cause high cycle fatigue of the head cover, spiral casing, runner and distributor. The mathematical model is solved by transfer matrix method. Data are processed in F-A char and MS Excel programs. Final results are demonstrated by frequency amplitude characteristics and by pressure mode shapes, where comparison of the mathematical model with the measurement is shown.
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High Frequency Pulsation of Water Turbine in Operation
Kubálek, Jiří ; Kozubková, Milada (referee) ; Hružík, Lumír (referee) ; Haluza, Miloslav (advisor)
This thesis is concentrated on mathematical modeling of high frequency pulsations in pump turbines, which are the source of high-cycle continuous stress of the spiral casing cover, wicket gates and runner. There are proposed the solutions using the transfer matrix for the tube with a constant and conical cross-section. The paper compares variations of cylindrical and conical tubes, changes in boundary conditions. There are the models of PSPP Dlouhé Stráně made only of cylindrical tubes comparing to the model with cylindrical and conical tubes
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|
|
Design study of sinus pump
Havlát, Pavel ; Kubálek, Jiří (referee) ; Pochylý, František (advisor)
This dissertation focuses on the construction design of a sine pump. It particularly deals with loss minimisation and strives to solve problems relating to excessive wear of the scrapergate which separates suction and the delivery space. The first part of the dissertation describes a new construction variation of a sine pump and the second part deals with a more detailed study including optimisation of one variation.
|
|
|
High-Frequency Pulsations Modeling
Střecha, Ludvík ; Kubálek, Jiří (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with the mathematical modeling of high-frequency pressure pulsations in water turbines. Pulsations are caused by the interaction between stator a rotor blades. These high-frequency pressure pulsations then cause high cycle fatigue of the head cover, spiral casing, runner and distributor. The mathematical model is solved by transfer matrix method. Data are processed in F-A char and MS Excel programs. Final results are demonstrated by frequency amplitude characteristics and by pressure mode shapes, where comparison of the mathematical model with the measurement is shown.
|
|
|
Hydraulic losses in pipes
Štefan, David ; Kubálek, Jiří (referee) ; Rudolf, Pavel (advisor)
The work deals with the effect of friction losses in pipes. Calculation of specific energy losses using the Darcy-Waisbach relationship. Calculation of friction coefficient in all areas of turbulent flow using the relations available, their comparison on the basis of average absolute deviations of calculated values from the values of Nikuradse chart. The result is the most accurate relations recommendations for the calculation of in different regions, graphic depiction of relations in Nikuradse diagram and evaluation of their performance.
|
|
|
Pump storage station
Šimek, Petr ; Sloupenský, Zdeněk (referee) ; Kubálek, Jiří (advisor)
This bachelor thesis deals with the functions of hydro-power plants, describes the various machinery and their distribution according to the parameters of use. Outlines the calculation in the design of hydraulic machines. There are also descriptions of machine layout and their use in praktice. For the particular case, there is prepared hydro power plant Dlouhé stráně. Related topic that is included here, the electricity system and the daily load diagram.
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