My thesis is engaged in description of ineligibility original version of the elbow draft tube new constructed small hydro power plant Doudlevce. Other main purpose was construction of better hydraulic thus more efficient this draft tube. First chapter meets project small hydro power plant Doudlevce and it specifies this interesting contstruction of the power plant (for example position of the turbine in vacuum fontain) and many others information about it. Second chapter and its particular parts there deal with functions of this draft tube, for example out-flow of water from turbine and a principle of water-energy utilization placing behind turbine runner. There is also described energy profit and how to get it throught draft tube. There is an analysis of important quantities, which are used during the scoring of flow in the draft tube in third chapter. This part of my thesis is aimed to meeting their principles. There is one of the main purposes of this thesis, where is a description of ineligibility original version of the elbow draft tube in fourth chapter. It results sizable from Kaplan´s attemps and analysis of flowing based on computations in computer programme CFD Fluent. Fifth chapter is about general principles, which should be looked out during the construction of the draft tube. There is also project of new hydraulic better draft tube and its another parts. Last chapter compares original version with new better project based on computations in computer programme CFD Fluent. Comparison is made of specific criterion flowing of water, where are described quantites in third chapter, and efficiency of this draft tube
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