Národní úložiště šedé literatury Nalezeno 7 záznamů.  Hledání trvalo 0.01 vteřin. 
Preliminary rersults on experimental investigation of a jet - shear flow interaction
Uruba, Václav ; Jonáš, Pavel ; Mazur, Oton
Preliminary results on effect of shear crossflow on its interaction with a jet are given. Comparison with the case of regular crossflow is shown.
Unsteady turbulent flow with adverse pressure gradient
Šarboch, Jaroslav ; Favre-Marinet, M.
Velocity and wall shear stress measurements in a periodic turbulent flow with adverse pressure gradient were performed in a conical difuser (air flow) and in a water diverging channel, both with the total divergence angle 6 degrees.
Application of thermoanemometry for investigation of the large water droplets in the vicinity of the LP stage of a full scale steam turbine
Mazur, Oton ; Uruba, Václav ; Šarboch, Jaroslav ; Řehák, Vratislav ; Jonáš, Pavel
The response of a CTA hot-wire anemometer on a water droplet impact is investigated. Characteristic shape of the CTA-output response signal after a jewater jet impact was ascertained. This knowledge was applied to an analysis of time records made in the vicinity of the LP stage of turbine. Statistical estimates of the occurrence and frquency of large droplets in the wet steam flow are presented.
Lokální detekce turbulentních signál; pomocí okamžitého spektra
Uruba, Václav
The method of turbulent - nonturbulent decision for an anemometric signal have been sugested using the instantaneous spectra. The wavelet transform has been applied.
On the spectral analysis of the wet steam flow in the vicinity of the LP stage of a full-scale steam turbine
Uruba, Václav ; Jonáš, Pavel ; Mazur, Oton ; Řehák, Vratislav
The unsteady steam velocity spectral characteristics were qualitatively evaluated for measurements brought upstream and downstream the LP stage. Using the conditional averaging technique the signal has been split up into periodical and random components. significant frequencies in velocity spectra have been detected.
Preliminery results of flow measurements in an elbow pipe of circular cross-section
Uruba, Václav ; Jonáš, Pavel ; Mazur, Oton ; Hanus, D.
A few results of experiments on secondary flow in curved pipe of circular cross-section are presented. The experiments have been carried out using a 5-hole pressure probe. comparison of the case of low-turbulent top-hat profile elbow inflow and fully developed turbulent channel flow has been made. the secondary flow effects have been found to be much stronger in the developed inflow case.
Kvalitativní analýza signálů z HW anemometru při měření v parní turbíně
Uruba, Václav ; Jonáš, Pavel ; Mazur, Oton ; Řehák, Vratislav
Jsou ukázány některé výsledky zpracování měření provedených na 220 MW parní turbíně při ustáleném provozu získané pomocí anemometru se žhaveným drátkem

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