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National Repository of Grey Literature 13 records found  previous11 - 13  jump to record: Search took 0.00 seconds. 
CFD simulation of vortex structure in the Francis turbine draft tube at part load operating point - comparison with measurements
 Neděla, Jiří ; Urban, Ondřej (referee) ; Štefan, David (advisor)
This master's thesis deals with simulation of vortex structure which is created in the draft tube of Francis turbine, at part load flow conditions. The main objective is to get the most accurate results from the calculations, using the student license of Ansys Fluent 19.1. The results from the calculations are compared with the experiment under the Francis-99 project. Mainlly in terms of dynamic properties of vortex rope – aplitude and frequency of pressure pulsations. Additionaly the time-averaged velocity profiles are compared. I used the test-case provided by NTNU – Norwegian University of Science and Technology under the Francis-99 workshop series.
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Pressure and velocity pulsations of liquid in thin cylindrical domain
 Oborná, Eliška ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The subject of this diploma thesis is a dynamic analysis of phenomena occurring in the thin cylindrical region, ie in a gab, which flows liquid by the given parameters. Through the simplifications introduced, it comes to the problem of structural and forced vibration for both the horizontal pulsation in a tube and the area of a compensating piston. The described method uses the separation of variables for pressure function. The speed function is derived from the already known pressure field distribution using the Navier-Stokes equation.
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Monitoring of Pressure Pulsations in the Hydraulic System of the Stator Current Signature Induction Machine
 Kroupa, M.
This paperis focused on monitoring and evaluation of pressure pulsations in the hydraulic system, which includes a hydrodynamic pump. The entire system is driven by an induction machine. The goal of this paper is to accurately determine pressure pulsations by measurement of elecrical variables of an induction machine.
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National Repository of Grey Literature : 13 records found   previous11 - 13  jump to record:
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