National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Řízení vyfukováním odtrženého proudu v kanálu se schodovitým rozšířením
Jonáš, Pavel ; Mazur, Oton ; Uruba, Václav
This paper is concerned with prospects of control of narrow channel flow behind a backward-facing step by blowing / suction near the step foot. The slots differ in both the orifice shape (rectangle or serrated) and area of its cross-section.
Výzkum zpětného proudění v oblasti odtržení
Uruba, Václav ; Mazur, Oton ; Jonáš, Pavel
A new method for reversing flow detection in separation regions has been sugested and evaluated.
Static pressure distribution on the wall of a narrow channel downstream from a backward-facing step
Jonáš, Pavel ; Mazur, Oton ; Uruba, Václav
Results of the measurement of static pressure distributions on wall in the separation region and downstream from the step are presented and analysed. The measurements were made at several values of the airflow velocity and at various configurations of the channel height upstream from the step and the step height.
Modelling of flow over a backward-facing step in streams with various turbulence level
Příhoda, Jaromír ; Sedlář, M.
Turbulent flow over a backward-facing step in streams with a various turbulence level was numerically simulated using software ANSYS CFX-5. Numerical solution carried on with the two-equation SST model and/or with a k-omega based Reynolds stress model was compared with experimental data obtained for three different values of free-stream turbulence level. The predicted length of the recirculation region corresponds well with experimental data but the dependence of the ratio xr/h on free-stream turbulence level is smaller.
Comparison of two ways of control of the CO2 concentration in the mixture with air in the pressurised calibration tunnel of the IT CAS
Mazur, Oton ; Moryń-Kucharczyk, E. ; Uruba, Václav
Two methods of the determination of the CO2 admixture concentration in the airflow inside the pressurised closed calibration tunnel of the IT AS CR are compared in the paper. The direct method, using the Analyser GUARDIAN PLUS takes continuously samples and with a delay determines the value of concentration. The second method is an indirect one. The calculation of concentration is based on the measurement of CO2 mass filled up into the known air volume in the tunnel at the given pressure and temperature.
A contribution to the similarity study of 3D-flow in channel with a step expansion of the cross-section
Jonáš, Pavel ; Mazur, Oton ; Uruba, Václav
A new experimental set-up and measuring methods for theinvestigation of a channel flow with a backward-facing step on one wall aredescribed. The static pressure distribution measurements and visualisation results are presented.
Temperature correction for a hot wire concentration measurements in a gas mixture
Mazur, Oton ; Jonáš, Pavel ; Uruba, Václav
The method of simultaneous flow velocity and concentration measurement by means of a constant temperature anemometer with two parallel hot wires probe in a binary gas mixture has been recently described. A special attention is paid to temperature calibration of the probe.
Two Parallel Hot-Wire Probe for Measurement in a Stream of Two Gases Mixture
Mazur, Oton ; Jonáš, Pavel ; Uruba, Václav
The paper deals with the method of simultaneous flow velocity and concentration measurement in a binary gas mixture by means of a constant temperature anemometer with two parallel hot wires probe.
Application of hot-film technique in analysis of transitional boundary layers
Jonáš, Pavel ; Wysocky, M. ; Elsner, W. ; Mazur, Oton ; Uruba, Václav
Wall-hot-film measuring technique is applied on the flat-plate boundary layer transition detection.
A note on the effect of the thermal conduction from a wall-hot-film sensor into the wall
Wysocky, M. ; Elsner, W. ; Jonáš, Pavel ; Mazur, Oton ; Uruba, Václav
Influence of the wall properties in hot-film measurement of transitional boundary layers is analyzed.

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