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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
LDA measurements and turbulence spectral analysis in an agitated vessel
 Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk
During the last years considerable improvement of the derivation of turbulence power spectrum from Laser Doppler Anemometry (LDA) has been achieved. The irregularly sampled LDA data is proposed to approximate by several methods e.g. Lomb-Scargle method, which estimates amplitude and phase of spectral lines from missing data, methods based on the reconstruction of the auto-correlation function (referred to as correlation slotting technique), methods based on the reconstruction of the time series using interpolation between the uneven sampling and subsequent resampling etc. These different methods were used on the LDA data measured in an agitated vessel and the results of the power spectrum calculations were compared. The measurements were performed in the mixing vessel with flat bottom. The vessel was equipped with four baffles and agitated with a six-blade pitched blade impeller. Three values of the impeller speed (Reynolds number) were tested. Long time series of the axial velocity component were measured in selected points. In each point the time series were analyzed and evaluated in a form of power spectrum.
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Local velocity measurements and energy dissipation
 Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk
The axial velocity profiles in agitated vessel was measured by Laser Doppler anemometry. From fluctuating velocities the dissipation of kinetic energy was evaluated. The several methods of dissipation determination was discussed and the power spectrum of kinetic energy was analysed.
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