Browsing EÚ-odbor fluidního inženýrství Viktora Kaplana by Title
Now showing items 1-20 of 29
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Additional effects of uid on the piston
(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 ... -
Aeration equipment for small depths
(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 ... -
Analytical Formula for the Mean Velocity Profile in a Pipe Derived on the Basis of a Spatial Polynomial Vorticity Distribution
(MDPI, 2021-05-14)The derivation of the mean velocity profile for a given vorticity distribution over the pipe cross-section is presented in this paper1. The velocity profile and the vorticity distribution are axisymmetric, which means that ... -
Application of Computer Graphics Flow Visualization Methods in Vortex Rope Investigations
(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 ... -
Check valve slam analysis in pumping station
(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 ... -
Comprehensive Study Of Unsteady Pressure Pulsations Induced By The Spiral Vortex Structure In A Conical Diffuser
(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 a high-specific speed turbine with non-uniform blade cascade
(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 ... -
Design of hydraulic recuperation unit
(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 ... -
Dynamics of pressure pulsations in thin annular gap
(IOP Publishing, 2021-06-15)Fluid pulsations can significantly influence behavior of bearings or sealing parts of hydraulic machines and therefore their operation. In this contribution, an analytical approach to solve pressure pulsations dynamics is ... -
Effect of Splitter Blades on Performances of a Very Low Specific Speed Pump
(MDPI, 2021-06-24)The usage of splitter blades to enhance the performances of low specific speed pumps is common practice. Based on experimental and numerical studies, the influence of the addition of one and two splitter blades is investigated ... -
Experimental analysis of static and dynamic properties of the check valves
(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 ... -
Experimental investigation of check valve behaviour during the pump trip
(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 ... -
Experimental investigation of swirl number influence on spiral vortex structure dynamics
(IOP Publishing, 2021-06-15)The hydraulic turbines are recently forced to operate far away from the optimal conditions in order to balance fluctuations in electricity generation. In case of Francis, pump and propeller turbines, using only single ... -
Experimental investigation of the check valve behaviour when the flow is reversing
(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 ... -
Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review
(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 ... -
FSI Computation and Experimental Verification of Fluid Flow in Flexible Tubes
(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 ... -
Influence of Second Viscosity on Pressure Pulsation
(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 ... -
Inner Damping of Water in Conduit of Hydraulic Power Plant
(MDPI, 2021-06-25)The operation of any hydraulic power plant is accompanied by pressure pulsations that are caused by vortex rope under the runner, rotor–stator interaction and various transitions during changes in operating conditions or ... -
An Investigation of Viscous Torque Loss in Ball Bearing Operating in Various Liquids
(MDPI, 2021-05-08)The limited functionality of seals that are used in hydraulic machines to prevent the liquid from leaking into the bearings may result in decrease in machine efficiency and reliability and may cause an accident of the whole ... -
Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection
(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 ...