Centrum energetického výzkumu

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Recent Submissions

Yanovych, Vitalii , Duda, Daniel , Uruba, Václav , Kosiak, Pavlo
The structure of turbulent flow behind the NACA 0012 airfoil at high angles of attack and low Reynolds number

This paper shows the results of a study of the turbulent structure behind the NACA 0012 airfoil. During the experiment, the flow velocity was 20 m·s−1. That corresponds the Reynolds number 1.3·105. The point behind the trailing edge was chosen for experimental studies. Measurements...

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&...

Kotlan, Václav , Hamar, Roman , Slobodnik, Karel , Dolezel, Ivo
Modeling of temperature patterns and hardness of surfaces obtained by additive technique

Temperature patterns and hardness of surfaces produced by laser cladding is modeled. The mathematical model includes the description of all important physical phenomena taking part in the process. Experimental ...

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...

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 ...