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Low specific speed pump working in turbine mode
Bezdíček, Jiří ; Moravec, Prokop (referee) ; Štefan, David (advisor)
The use of the pump in turbine mode is an evolving area. For this reason, research of less standard pumps from the edges of the specific speed spectrum is suitable for this purpose. This diploma thesis was focused on the influence of splitter blades on the exclusively turbine mode of a low specific speed pump. CFD calculations of the pump were performed, considering the sidewall gaps between the stator and the rotor. CFD served not only to obtain turbine characteristics but also to describe the flow and analysis of other phenomena, such as volumetric efficiency or hydraulic forces.
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Methods of Determination of Moisture Content
Bezdíček, Jiří ; Lachman, Jakub (referee) ; Lisá, Hana (advisor)
With the growing interest in the energy use of biomass in the form of solid biofuels, the requirements for determining the moisture content of these fuels are also growing. Moisture is an important factor not only in the production of biofuels, where the moisture values must be ideal, eg in the production of pellets, but also in storage and other processes. The aim of the work was to determine the suitability of methods for determining moisture for various types of solid biofuels. The main subject of interest was fuels with grain structure. A search of the basic distribution of fuels and introduced and new methods for determining moisture was performed. The research was focused on oven drying methods. The result is the determination of the unsuitability of the method of drying scales for fuels with grain structure, the suitability of all investigated methods for wood fuels, the accuracy of the reference method for most fuels and the susceptibility of the analytical method to the homogeneity of the test portion.
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CFD simulation of the hydrokinetic energy converter using flow-induced vibrations
Vaverka, Jakub ; Bezdíček, Jiří (referee) ; Klas, Roman (advisor)
Flow-induced vibrations on bodies of different shapes are investigated by CFD simulations. The influence of the mass of the body, the spring stiffness and the value of the added damping on the dynamic behaviour of the system is evaluated. A combination of the 6DOF function and a dynamic computational mesh is used to move the body around the y-axis solely by fluid flow. The output is an evaluation of the forces acting on the body, the trajectory of the body and the possible power that the body could generate by its motion.
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Low specific speed pump working in turbine mode
Bezdíček, Jiří ; Moravec, Prokop (referee) ; Štefan, David (advisor)
The use of the pump in turbine mode is an evolving area. For this reason, research of less standard pumps from the edges of the specific speed spectrum is suitable for this purpose. This diploma thesis was focused on the influence of splitter blades on the exclusively turbine mode of a low specific speed pump. CFD calculations of the pump were performed, considering the sidewall gaps between the stator and the rotor. CFD served not only to obtain turbine characteristics but also to describe the flow and analysis of other phenomena, such as volumetric efficiency or hydraulic forces.
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Vliv biotechniky sadby na odrůstání krytokořenného sadebního materiálu smrku ztepilého a buku lesního
Bezdíček, Jiří
The aim of thesis was to determine the effect of the different plantation biotechnique, different types of packaging and soil type for growing up of Norway spruce and European beech ball and balled planting stock. Measurements were performed on two plots within Management-plan area LESCUS Cetkovice Ltd. and it was a combination of medium-heavy-textured and heavy-textured soils. The types of planting for different types of planting stock were determined which were subsequently measured various parameters in the above-ground and underground parts of the plant. Based on the measured values, it was found which of the variants on the given soil grows best and which, on the other hand, is the worst. Furthermore, the strong influence of game on planted plants was detected. For afforestation are suitable ball and balled planting stock with type of packaging HIKO V-120 and HIKO V-350 for Norway spruce and European beech ball and balled planting stock with type of packaging HIKO V 265.
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Methods of Determination of Moisture Content
Bezdíček, Jiří ; Lachman, Jakub (referee) ; Lisá, Hana (advisor)
With the growing interest in the energy use of biomass in the form of solid biofuels, the requirements for determining the moisture content of these fuels are also growing. Moisture is an important factor not only in the production of biofuels, where the moisture values must be ideal, eg in the production of pellets, but also in storage and other processes. The aim of the work was to determine the suitability of methods for determining moisture for various types of solid biofuels. The main subject of interest was fuels with grain structure. A search of the basic distribution of fuels and introduced and new methods for determining moisture was performed. The research was focused on oven drying methods. The result is the determination of the unsuitability of the method of drying scales for fuels with grain structure, the suitability of all investigated methods for wood fuels, the accuracy of the reference method for most fuels and the susceptibility of the analytical method to the homogeneity of the test portion.
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Vliv biotechniky sadby na odrůstaní krytokořenného sadebního materiálu smrku ztepilého
Bezdíček, Jiří
The aim of thesis was to determine the effect of the different plantation biotechnique, different types of packaging and soil type for growing up of Norway spruce and European beech ball and balled planting stock. Measurements were performed on two plots within Management-plan area LESCUS Cetkovice Ltd. and it was a combination of lighter-textured and heavier-textured soils. The types of planting for different types of planting stock were determined which were subsequently measured various parameters. Based on the measured values, it was found that the planting method is the best and the worst vice versa to the specific soil. Furthermore, the influence of game on planted plants was detected. For afforestation are suitable ball and balled planting stock with type of packaging HIKO V-120 and HIKO V-350 for Norway spruce and European beech ball and balled planting stock with type of packaging HIKO V 265.
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