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Vliv nestabilit na určení střední teploty ve volném proudu termického plazmatu
Hlína, Jan ; Šonský, Jiří ; Šlechta, Jiří
We have used results acquired by a multi-directional optical system for temperature measurements with a high temporal resolution to compare mean temperatures in the jet obtained by averaging the instantaneous temperature fields with the temperature values acquired in the usual way from averaged radiation intensities. The comparison shows differences in results yielded by both methods which are caused by the nonlinear dependence of radiation intensity on temperature.
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Simulace kavitační nestability v induktoru se 3 lopatkami
Sedlář, M. ; Maršík, František ; Zima, Patrik
Axial-flow inducers are used to improve cavitation performance of radial-flow or mixed-flow pumps. There is a wide range of cavitation instabilities, which can be observed during inducer operation, even at the design flow rate. The type of cavitation instability is determined by the frequency analysis. Two cavitation models were used to determine the frequency range of four different types of cavitation instabilities – CEV and VOF built in the ANSYS CFX software – for a 3-blade inducer and suction impeller of a multistage pump. The calculated values of NPSH3 were compared with experimental data for SST, SST-SAS and RSM SSG turbulence models for fully unsteady solutions. It was found that the SST-SAS model provides the most realistic picture of the backflow vortices and their oscillations.
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Experiment E3/2 - Vliv teploty na boční tlak sypkého tělesa
Valach, Jaroslav ; Koudelka, Petr
The first part of long-term experiment E3 with passive pressure has been started in the second half of 2001 and carried out during 2002. The partial experiment has been marked E3/2 according to the second type of the wall movement (rotation about the top). The paper presents the analysis of temperature changes of the stand structure at the results of the experiment E3/2.
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