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1. CFD simulation of the velocity and pressure fields within two-stage pump interior

Creator:
Klas, Roman and Fialová, Simona
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
two-stage pump, turbine, angle of attack, and modeling
Language:
English
Description:
CFD simulation is aimed on the two-stage pump operation modeling in the pump and turbine regime. The flow analysis will be focused on the proper angle of wicket gates attack and on the separation localization. This investigation should bring the geometry modifications that will increase the hydraulic efficiency. The computational model was created in preprocessor GAMBIT and software Fluent will be used for the finite computation.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. High-frequency pulsations modeling

Creator:
Kubálek, Jiří and Habán, Vladimír
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
turbine, pump, and high-frequency pulsations
Language:
English
Description:
This paper focuses 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. The problem is solved by transfer matrix method. F-A char. and MS Excel programs have been used for data processing. Final results are presented by graphs of frequency-amplitude characteristic depending on running speed of motor, and plots of the pressure mode shape in selected phase shifts. Modeled variants are those of wheels with 7; 9 blades and 7 blades and 7 splitter-blades. The number of distributing blades is 20. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Hydro-potential utilization of cooling water on the hydro-electric power plant Dalešice

Creator:
Hudec, Martin, Haluza, Miloslav, and Kubálek, Jiří
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
renewable energy, turbine, and cooling water
Language:
English
Description:
Engineering solution of a surplus pressure head in a system of reversible machine unit's cooling water. Current technologies suppplemented with Francis turbine or more precisely a centrifugal volute-type pump in turbine mode. It contains the layout for the basic extent of several various high-speeds with regard to maximum coverage of working conditions. Minimization of construction works on the structure of the cooling water inlet. Furthermore it includes an assignment of the annual power production.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public