HOT-WIRE ANEMOMETER INVESTIGATION OF SURFACE WIND VELOCITY AND TEMPERATURE FLUCTUATIONS AT TWO SOUTHERN CALIFORNIA SITES.
Abstract
An experimental investigation of the atmospheric turbulence velocity and temperature fields was performed at The Aerospace Corp. San Fernando Observatory on Van Norman Lake and at The Aerospace Corp. parking lot, El Segundo, Calif. The velocity fluctuations were measured with a constant-temperature hot-wire anemometer and the temperature and optical index of refraction fluctuations with a laser turbulence meter. The instrument outputs were analyzed to provide overall rms value, power spectral density, and autocorrelation functions. Selected cases of the velocity data (where two probes were employed) were analyzed to yield cross-correlations and cross-spectra information. Measurements by both types of instrument at San Fernando indicated that turbulence was strongest near the ground and decreased up to 10 to 20 feet and then remained essentially constant up to 60 feet. This information was used in the design of the structure housing the new 24-in.-diam solar spectroheliograph to determine the optimum elevation of the instrument. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1970
- Accession Number
- AD0702795
Entities
People
- David H. Ross
Organizations
- The Aerospace Corporation