Characteristics of the frequency analysis of wall turbulence structure
Abstract
The influence of instrument frequency resolution on the results of turbulent flow measurements is analyzed. Fluctuations in the temperature and axial velocity components of both isothermal and nonisothermal air flows were measured in a duct at a Reynolds number of about 10,000. Variations in the fluctuation intensity of the total signal were found to be in good agreement with the results of Laufer (1954). Frequency cutoff (especially at low frequencies) was shown to make the measured intensities of the velocity and temperature fluctuations too low. Results also showed amplitude analysis of the frequency-separated signals to be a viable method for determining the structure of turbulent flows.
- Publication:
-
Teplofizika Vysokikh Temperatur
- Pub Date:
- November 1981
- Bibcode:
- 1981TepVT..19..581P
- Keywords:
-
- Air Flow;
- Ducted Flow;
- Flow Characteristics;
- Flow Measurement;
- Turbulent Flow;
- Wall Flow;
- Autocorrelation;
- Axial Flow;
- Flow Velocity;
- Probability Density Functions;
- Reynolds Number;
- Temperature Distribution;
- Fluid Mechanics and Heat Transfer