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Collection's Items (Sorted by Submit Date in Descending order): 1 to 13 of 13
Duda, Daniel , Yanovych, Vitalii , Tsymbalyuk, Volodymyr , Uruba, Václav
Effect of Manufacturing Inaccuracies on the Wake Past Asymmetric Airfoil by PIV

The effect of manufacturing geometry deviations on the flow past a NACA 64(3)-618 asymmetric airfoil is studied. This airfoil is 3D printed according to the coordinates from a public database. An optical high-precision 3D scanner, GOM Atos, measures the difference from the idealized...

Klimko, Marek , Lenhard, Richard , Žitek, Pavel , Kaduchová, Katarína
Experimental Evaluation of Axial Reaction Turbine Stage Bucket Losses

The article describes the measurement methods and data evaluation from a single-stage axial turbine with high reaction (50%). Four operating modes of the turbine were selected, in which the wake traversing behind nozzle and bucket with five-hole pneumatic probes took place. The article&...

Duda, Daniel , Yanovych, Vitalii , Uruba, Václav , Žitek, Pavel , Milčák, Petr , Jelínek, Tomáš , Němec, Martin
Experimental investigation of the unsteady stator/rotor wake characteristics downstream of an axial air turbine

A feasibility study of velocity field measurements using the Particle Image Velocimetry (PIV) method in an axial air turbine model is presented. The wakes past the blades of the rotor wheel were observed using the PIV technique. Data acquisition was synchronized with the shaft ...

Duda, Daniel , Uruba, Václav , Yanovych, Vitalii
Wake width: Discussion of several methods how to estimate it by using measured experimental data

Several methods of defining and estimating the width of a turbulent wake are presented and tested on the experimental data obtained in the wake past an asymmetric prismatic airfoil NACA 64(3)‐618, which is often used as tip profile of the wind turbines. Instantaneous velocities...

Sláma, Václav , Mrózek, Lukáš , Tajč, Ladislav , Klimko, Marek , Žitek, Pavel
Flow analysis in a steam turbine control valve with through-flow valve chamber

A nuclear power plant also includes a secondary cycle, which main component is a steam turbine. The steam turbine processes the thermal and pressure energy of steam and converts it into mechanical energy. Reliable and safe operation of the steam turbine, thus of the entire...

Rot, David , Hrbek, Jan , Jiřinec, Jakub
Heat transfer in induction melting of aluminum oxide in cold crucible

This paper presents a research study detailing the procedure and results of experimental eye-tracking research to evaluate employers' career websites. The objective of this research was to gain an insight into Generation Y's perspective on the career websites of prospective employers....

Duda, Daniel , Yanovych, Vitalii , Uruba, Václav
An experimental study of turbulent mixing in channel flow past a grid

Grid turbulence is considered to be a canonical case of turbulent flow. In the presented paper, the flow structure is analyzed from the point of view of mixing properties, where vortical structures and their properties play a significant role. That is why the effect of va...

Vilcsek, Igor , Stach, Ondřej , Kříž, Antonín
Orbitální svařování heterogenních spojů

For nuclear energy, fusion arc welding is one of the key technologies not only for production of equipment, but also for its maintenance, assembly and repair. Due to the fact that there is a radioactive medium inside the facility, the leakage of which could have catastrop...

Yanovych, Vitalii , Duda, Daniel , Uruba, Václav
Structure turbulent flow behind a square cylinder with an angle of incidence

This article shows the results of a study of the structure of turbulent flow behind a square profile ALUTEC 45×45mm with T-slots. The angle of rotation of the profile relative to its axis varied α=0°, 15°, 30° and 45°. During the experiment, the flow velocity was 5m⋅...

Žitek, Pavel , Klimko, Marek
Experimentální vzduchová turbína VT-400.

The nuclear power plant also includes a secondary cycle. One of the main components of the cycle is a steam turbine. The flow through the flow path is very complicated and significantly affects the turbine efficiency. An single-stage axial experimental air turbine is located i...

Uruba, Václav , Procházka, Pavel , Skála, Vladislav
On the streamwise structures in the boundary layer under adverse pressure gradient on an inclined plate

The presented study is focused on experimental investigation of a boundary layer on a flat plate in adverse pressure gradient. The flat plate is placed in a regular flow, the pressure gradient is generated by the plate inclination. The preceding studies deal with structure of&...

Sedlář, Milan , Procházka, Pavel , Komárek, Martin , Uruba, Václav , Skála, Vladislav
Experimental Research and Numerical Analysis of Flow Phenomena in Discharge Object with Siphon

This article presents results of the experimental research and numerical simulations of the flow in a pumping system’s discharge object with the welded siphon. The laboratory simplified model was used in the study. Two stationary flow regimes characterized by di erent volume flow r...

Uruba, Václav
Energy and Entropy in Turbulence Decompositions

The role of energy and entropy in the decomposition of turbulent velocity flow-fields is shown in this paper. Decomposition methods based on the energy concept are taken into account—proper orthogonal decomposition (POD) and its extension bi-orthogonal decomposition (BOD). The methods are we...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 13 of 13