National Repository of Grey Literature 49 records found  previous10 - 19nextend  jump to record: Search took 0.01 seconds. 
A comment on the flat plate leading edge shape on laminar-turbulent transition
Antoš, Pavel ; Jonáš, Pavel ; Procházka, Pavel P.
Laminar-turbulent transition region is investigated in zero pressure gradient boundary layers developing on flat plates with different shapes of leading edges namely with the elliptical profile; the superelliptical one and with the thin circle profile. The mean flow field characteristics are presented and discussed. Near downstream from the leading edge are mean velocity profiles very similar to the Blasius solution in all compared configurations. The dramatic effect of the leading edge is ascertained in the beginning of the skin friction coefficient deflection from the course after Blasius solution. The start of deflection is moving downstream in sequence: elliptic – super-elliptic – circle shape. The length of the transitional region shortens in the opposed sequence.
Effect of The Leading Edge on The Transitional Region in The Boundary Layer in External Turbulent Flow
Antoš, Pavel ; Jonáš, Pavel ; Procházka, Pavel P. ; Skála, Vladislav ; Uruba, Václav
The location and the area of the flat plate boundary layer transitional region has been investigated when changing the shape of leading edge and the external turbulence level. Experiments were performed in the close circuit wind tunnel of D1 IT ASCR with cross section of 0.9 m x 0.45 m and with either natural turbulence level (about 0.003) or gained by a grid across the flow (turbulence level 0.03 at the leading edge). The fundamental boundary layer characteristics illustrating differences are presented.
Measurement of turbulence in the Skoda-Power experimental facilities
Uruba, Václav ; Jonáš, Pavel ; Antoš, Pavel
In the report results of turbulence measurement in the wind tunnel VZLU Palmovka and in the test turbine Skoda Power in Plzen are shown.
Measurement of turbulence in the IT transonic wind tunnel
Uruba, Václav ; Jonáš, Pavel ; Antoš, Pavel
In the report results of turbulence measurement in the IT wind tunnel in Nový Knín are given.
Turbulence Measurement in the Model Turbine Škoda
Jonáš, Pavel ; Uruba, Václav ; Antoš, Pavel ; Hoznedl, M. ; Sedlák, K.
Time-averaged unsteady flow characteristics were investigated by CTA thermoanemometer with a rotary hot-wire downstream the LP stage of the 10 MW experimental turbine ŠKODA. The direction and the magnitude of mean velocity vector, the components of turbulent heat transfer vector and the components of Reynolds stress tensor were evaluated from the measurement in the superheated water steam.
Turbulence Study of Skoda Turbine Cascade VZLU Wind Tunel
Uruba, Václav ; Jonáš, Pavel ; Antoš, Pavel ; Jelínek, T. ; Michálek, J.
Time-averaged unsteady flow characteristics were investigated using CTA thermoanemometer with a rotary hot-wire in the VZLÚ test facility for testing ŠKODA turbine linear cascades. Direction and magnitude of the mean velocity vector and the components of Reynolds stress tensor and other statistical characteristics were evaluated for given configurations.
Measurement of temperature fluctuations generated by parallel heat sources in a turbulent flow
Antoš, Pavel
Paper deals with the temperature field generated by a system of parallel heated wires placed in the turbulent flow. A variance of temperature fluctuation was evaluated from the thermoanemometry measurement employing a dual probe. Decay of the temperature fluctuations follows power law.
Velocity and Temperature Decay in Turbulent Flow behind Parallel Heat Sources
Antoš, Pavel ; Uruba, Václav
Paper deals with the velocity and temperature field generated by a system of parallel heated wires placed in grid-generated turbulent flow. Development of the temperature field was studied for a number of configurations of grid generator and line heater was investigated experimentally. Decay of the temperature fluctuations was evaluated from thermoanemometry measurements.
HWA Measurement of Turbulent Diffusion of a Scalar Quantity
Antoš, Pavel
The paper deals with simultaneous measurement of the velocity and the scalar quantity by means of hot-wire anemometry. Statistical moments of the scalar quantity fluctuations can be obtained employing a dual hot-wire probe. An evaluation procedure of the mean values and the fluctuations is described. Results from the molar concentration measurement in binary-gas mixture are shown.
Development of Two-Sensor Hot-Wire Probes for Measurement of the Velocity and the Temperature
Antoš, Pavel ; Mazur, Oton
Characteristics of a new two-sensor HWA probe designed for simultaneous measurement of the velocity and the flow temperature are described. A comparison with previously developed probe is given. Both tested probes were developed and manufactured at Fluid dynamics laboratory of the Institute of Thermomechanics.

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31 Antoš, Pavel
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