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Hydraulic Jump Energy Dissipation in the channel extension
Pospíšil, Radek ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The diploma thesis is focused on the evaluation of the suppression of supercritical current energy in the area of the river bed extension. The hydraulic model was used to simulate current conditions for different variants of river bed arrangement. Individual variants were then evaluated according to the relevant criteria and compared with each other. Results can be applied in hydrotechnical practice based on model similarity.
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Thin-plate rectangular weir with inlet shaft
Šváb, Jiří ; Šulc, Jan (referee) ; Zachoval, Zbyněk (advisor)
The thesis is divided into literary research and practical part (own measurement). The content of the literary research is a description of the flow over thin-plate rectangular weir. The practical part is focused on a description of the model, measuring equipment and measurement. The results are evaluation of lower and upper surface of nappe, determination of discharge coefficient, coefficient of relative length of shaft, limit value of relative length of shaft for uninfluenced shape of nappe.
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DETERMINATION OF FLOW AND LOAD CHARACTERISTICS OF SURFACE FLAP GATES THROUGH PHYSICAL AND NUMERICAL MODELING
Picka, Daniel ; Možiešik,, Ľudovít (referee) ; Pochylý,, František (referee) ; Šulc, Jan (advisor)
The subject of research were effect of elevated water level in the downstream apron on the weir flow capacity and load characteristics of the flap gate. The thesis is focused on possibilities of physical and CFD modeling of flap gate weir flow. In the introduction are contained current condition of knowledge, perfomed model studies conducted in the Czech republic and abroad, as well as flap weirs realized in our country and in the world. This is followed by experimental physical research on family of weir structure models in scales 1:1 (prototype), 1:2 and 1:2.5. Options CFD simulations a flap gate weir are contained in chapter of CFD modeling. In conclusion are compared physical methods with CFD simulations on flap gate weir.
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Hollow cone valve capacity in the restricted outflow conditions
Nehudek, Adam ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The thesis aims to determine the influence partial or complete submerge of hollow cone valve by outflow on its capacity without space restrictions, by outflow into discharge chamber and by outflow into water tunnel of circular cross section. The valve capacity is for mutual comparability purposes usually characterized by discharge coefficient. Research works have been performed on a spatial hydraulic model of the valve with inlet diameter D = 67 mm and an apex angle of a cone 90°. Values of the discharge coefficient obtained from measurements were statistically analyzed. The dependence of discharge coefficient, expressed by energy head, on submerged level was approximated by an exponential function. Exponent value of this function express the dependance rate of valve capacity on downstream water level. This procedure didn’t demonstrate signifiant dependance downstream water level on hollow cone valve capacity, only on tests at outflow to water tunel showed a low increase in the discharge coefficient partly due to the influence of kinetic energy of the stream flowing out of the tunnel on the energy head and also due to underpressure. Independence of discharge coefficient value on valve head has been prooved for head greather than 232 mm. Also was defined 3 stages of interaction outflow jet from valve and downstream water, some of them may cause on real waterworks structures unfavorable situations (may affect excessive load on valve by pressure pulsations). The presented results allow better evaluation of bottom outlets capacity at higher water levels, when the valves are flooded. Significant effect of sufficient aeration (especially in long water tunnels) on valve capacity was also confirmed. Taking into account on the specifics of hollow jet valves and cone valves, it is possible to generalize some of this resultos on them as well.
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Technical design of an alternative to the small hydropower plant Ejpovice
Mitrega, Stanislav ; Jobánek, Stanislav (referee) ; Šulc, Jan (advisor)
The main purpose of this bachelor’s thesis is a new design of a small hydroelectric power plant Ejpovice with non-pressure and pressure derivation. The non-pressure part of a waterway includes design of a weir, culvert and an inlet channel. The pressure part of a waterway includes an intake object and an original tunnel. The design review includes two variants of a waterway. In the first variant water is running straight through the tunnel. The second variant is considering with a glass reinforced pipe that will be installed in the tunnel so the tunnel won’t be flooded. At first the thesis analyses all the sources for the preparation of a design and discribes an area of interest. Below the thesis presents a design of all the new building objects and technological equipments. Detailed restoration of the tunnel is also described. In conclusion of the thesis, there are calculations of a power generation and an economic analysis of both variants. The payback period of the second variant is significantly longer than the period of the first variant although an alternative design doesn’t require a comlicated restoration of the tunnel. On the basis of this fact I recommend to implement the first design.
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Influence of transverse bottom elements on energy dissipation in the stilling basin
Knoflíček, Jakub ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The thesis is dealing with comparing of the kinetic energy flow dissipation in stilling basins of different cross-section, supplemented by cross bottom elements based on model research. Purpose of work is the desire to reconstruct the existing building security structure of waterworks along with increasing their capacity. Within experimental research were measured depths in different variants. Based on the results of model tests are evaluated and tabulated sorted variants of the combat effectiveness of the kinetic energy flow. The results will be used for the efficient design of additional alterations of stilling basins.
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Shaping discharge chamber of hollow cone valve
Nehudek, Adam ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The thesis is dealing with the design and position of the discharge chamber of hollow cone valve and is based on model research. The research response especially to the existing bottom outlets, where the position of valve is changed as opposed to the current position. The change of the valve position causes construction interventions minimization and also required financial resources are minimized. The other case is to interchange the old cone valve and the new one. This action is supporting the idea of valve spare parts unfication. In the research has been defined the automodeling area of outlet jet diversion from valve axis for different remoteness between water surface level and valve. The outflow jet diversion angle from valve axis has been measured in relation with relative valve opening. The coefficient of outflow has been specified in relation with relative valve opening. Furthermore, it has been searched for the position of discharge plane, where the discharging is done without backsplash. The last part of model tests was the discharge effect evaluation of most used chamber shapes. In the final chapter has been recomended the optimal shape and position of discharge chamber in dimensionless units, relative to the inlet diameter of the valve, all this based on results of model research. These results will enable reliable and efficient design of additional adjustments of discharge chamber shapes.
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Safety submersion depth of small hydro-power plant Vydra 2 inlet
Jobánek, Stanislav ; Žoužela,, Michal (referee) ; Šulc, Jan (advisor)
The thesis deals the measurement results on a physical model of the inlet part of the small hydro-power plant Vydra 2. The influence of the shape and location of the intake into the pressure pipe of small hydro-power plant Vydra 2 with respect to the water surface state was analysed. The work also deals with possibilities of using devices to eliminate the generation of vortex of higher intensities.
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efficiency of the bottom elements on the supercritical flow energy dissipation
Knoflíček, Jakub ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The thesis is dealing with comparing dissipation of the kinetic energy water flow using various bottom elements based on model research. There is missing information about efficiency of different kinds of bottom elements. This absence does not allow to compare different modification of the bottom of stilling basins. Within experimental research were measured depths in different variants. Based on the results of model tests are evaluated and tabulated sorted variants of the combat efficiency of the kinetic energy water flow. The results will be used for the efficient and economic design of additional alterations of stilling basins.
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