Laboratory-Based Atmospheric Turbulence Experiments: C(sup 2)(n) - Epsilon Characterization and Non-Kolmogorov Propagation
Abstract
Fluid-mechanic and optical-based measurements have been used to examine the nature of turbulence statistics in a heated axisymmetric jet. Single-component streamwise velocity fluctuation spectra have indicated the flow to have a -5/3 spectral slope within 7 jet diameters of the jet's exit. Structure functions computed using both angle of arrival and optical phase were found to be inconclusive at identifying non-Kolmogorov statistics within the jet. Spectral slopes of angle-of-arrival signals were found to be useful at indicating anisotropy in the optical turbulence in a region that appeared Kolmogorov using single-component fluid mechanic measurements. Subsequent two-component velocity measurements have verified the optically-detected flow anisotropy. Anisotropy occurs in flow regions where there are large differences between longitudinal and lateral velocity components. Both fluid- mechanic and optical statistics collected along the major flow axis (longitudinal direction) have Kolmogorov statistics, while data collected in directions transverse to the major flow axis (lateral direction) have non-Kolmogorov statistics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 2003
- Accession Number
- ADA417797
Entities
People
- Ronald J. Hugo
Organizations
- University of Calgary