Now showing items 1-20 of 27

  • Aeration equipment for small depths 

    Sluše, Jan; Pochylý, František (EDP Sciences, 2015-05-06)
    Deficit of air in water causes complications with cyanobacteria mainly in the summer months. Cyanobacteria is a bacteria that produces poison called cyanotoxin. When the concentration of cyanobacteria increases, the phenomena ...
  • Comprehensive Study Of Unsteady Pressure Pulsations Induced By The Spiral Vortex Structure In A Conical Diffuser 

    Štefan, David; Rudolf, Pavel; Hudec, Martin; Habán, Vladimír (Faculty of Technologies and Systems, 2015-09-09)
    The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out ...
  • Design of hydraulic recuperation unit 

    Jandourek, Pavel; Habán, Vladimír; Hudec, Martin; Dobšáková, Lenka; Štefan, David (EDP Sciences, 2015-11-17)
    Article deals with design and measurement of hydraulic recuperation unit. Recuperation unit consist of radial turbine and axial pump, which are coupled on the same shaft. Speed of shaft with impellers are 6000 1/min. For ...
  • Spatio-temporal description of the cavitating flow behavior around NACA 2412 hydrofoil 

    Rudolf, Pavel; Štefan, David; Sedlář, Milan; Kozák, Jiří; Habán, Vladimír; Huzlík, Rostislav (IOP Publishing, 2015-12-06)
    Spatio-temporal description of the cavitating flow around hydrofoil with 8 degrees incidence using proper orthogonal decomposition (POD) is presented. POD is a suitable tool, which provides information not only about the ...
  • Check valve slam analysis in pumping station 

    Himr, Daniel; Habán, Vladimír; Dokoupil, Pavel (EDP Sciences, 2016-03-28)
    Pumping station supplies water for technological process. The check valve in the station was replaced with a new one. The regular test of black out discovered the high pressure pulsations accompanied with noticeable pipeline ...
  • Experimental investigation of check valve behaviour during the pump trip 

    Himr, Daniel; Habán, Vladimír; Hudec, Martin (IOP Publishing, 2017-04-04)
    The paper is focused on the description of an experimental investigation of a nozzle check valve. Attention is paid to the behaviour during transitions when the flow is decelerating. Flow reversal is often accompanied with ...
  • Valve exploiting the principle of a side channel turbine 

    Jandourek, Pavel; Pochylý, František; Habán, Vladimír (IOP Publishing, 2017-04-04)
    The presented article deals with a side channel turbine, which can be used as a suitable substitute for a pressure reducing valve. Pressure reducing valves are a source of high hydraulic losses. The aim is to replace them ...
  • Experimental investigation of the check valve behaviour when the flow is reversing 

    Himr, Daniel; Habán, Vladimír; Hudec, Martin; Pavlík, Václav (EDP Sciences, 2017-05-12)
    Check valve in a pipeline is supposed to prevent the reverse flow and to allow the flow in the positive direction. The construction of check valves follows these requirements, but the check valve must not cause pressure ...
  • Additional effects of uid on the piston 

    Himr, Daniel; Habán, Vladimír; Kůrečka, Jan; Pochylý, František (EDP Sciences, 2018-06-04)
    Additional eect of uid on the solid body is often ignored phenomenon. Although it is possible to do an analytic derivation of equations describing additional eects for many various conditions, it can be dicult to solve ...
  • Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection 

    Rudolf, Pavel; Litera, Jiří; Ibarra Bolanos, Germán Alejandro; Štefan, David (EDP Sciences, 2018-06-04)
    Vortex rope, which induces substantial pressure pulsations, arises in the draft tube (diffuser) of Francis turbine for off-design operating conditions. Present paper focuses on mitigation of those pulsations using active ...
  • A new form of equation for force determination based on Navier-Stokes equations 

    Fialová, Simona; Pochylý, František; Šedivý, Dominik (EDP Sciences, 2018-11-12)
    This work is focused on calculating the force effects of an incompressible homogeneous liquid on a surface of a rigid or a flexible tube. An unsteady flow induced by differential pressure at the beginning and at the end ...
  • Experimental analysis of static and dynamic properties of the check valves 

    Dokoupil, Pavel; Himr, Daniel; Habán, Vladimír (EDP Sciences, 2019-06-28)
    The check valves play an important role in safety and reliability of many technologies using liquid or gas flow. Check valves are elements of the hydraulic system enabling the one-way flow without a significant pressure ...
  • Turbulence Models for Simulation of the Flow in a Rotor-Stator Cavity 

    Zemanová, Lucie; Rudolf, Pavel (EDP Sciences, 2019-06-28)
    Modelling of the flow in the cavities between a rotor and a stator is a task of great engineering interest. Correctly evaluated pressure and velocity field enables calculation of the disk losses and therefore assessment ...
  • Design of a high-specific speed turbine with non-uniform blade cascade 

    Stareček, Jakub; Čupr, Pavel; Haluza, Miloslav (EDP Sciences, 2019-06-28)
    This paper presents the hydraulic design of Kaplan type turbine in fully axial configuration. The turbine model consists of a straight pipe intake, a rib which covers the shaft, five axial guide vanes, a six blade runner ...
  • Influence of Second Viscosity on Pressure Pulsation 

    Himr, Daniel; Habán, Vladimír; Fialová, Simona (MDPI, 2019-12-12)
    A mathematical model of pulsating flow is proposed in the paper. The model includes more accurate description of energy dissipation, so it allows, for example, better stability analysis of water power plant control and ...
  • Removal of Microcystis aeruginosa through the Combined Effect of Plasma Discharge and Hydrodynamic Cavitation 

    Maršálek, Blahoslav; Maršálková, Eliška; Odehnalová, Klára; Pochylý, František; Rudolf, Pavel; Sťahel, Pavel; Ráheľ, Jozef; Čech, Jan; Fialová, Simona; Zezulka, Štěpán (MDPI, 2019-12-18)
    Cyanobacterial water blooms represent toxicological, ecological and technological problems around the globe. When present in raw water used for drinking water production, one of the best strategies is to remove the ...
  • FSI Computation and Experimental Verification of Fluid Flow in Flexible Tubes 

    Šedivý, Dominik; Fialová, Simona; Klas, Roman; Kotek, Michal (Sciendo, 2020-07-24)
    Presented paper is focused on the experimental and computational study of fluid flow in pipes with flexible walls. One possible real example of this phenomenon is the blood flow in arteries or their substitutes in the human ...
  • Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria 

    Čech, Jan; Sťahel, Pavel; Ráheľ, Jozef; Prokeš, Lubomír; Rudolf, Pavel; Maršálková, Eliška; Maršálek, Blahoslav (MDPI, 2020-11-12)
    Efficient treatment of contaminated water in industrially viable volumes is still a challenging task. The hydrodynamic cavitation plasma jet (HCPJ) is a promising plasma source for industrial-scale generation of biologically ...
  • Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review 

    Zemanová, Lucie; Rudolf, Pavel (MDPI, 2020-12-15)
    The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates ...
  • Application of Computer Graphics Flow Visualization Methods in Vortex Rope Investigations 

    Urban, Ondřej; Kurková, Michaela; Rudolf, Pavel (MDPI, 2021-01-26)
    Computer graphics visualization techniques for application on data from Computational Fluid Dynamics (CFD) simulations of the vortex rope, a phenomenon present in hydraulic turbines operating in off-design conditions, were ...