TURBULENT FRONT STRUCTURE OF AN AXISYMMETRIC COMPRESSIBLE WAKE
PHILCO-FORD CORP NEWPORT BEACH CA SPACE AND RE-ENTRY SYSTEMS DIV
Pagination or Media Count:
Intermittency measurements have been performed within the first one hundred virtual diameters of an axi-symmetric compressible wake. The primary measurements, performed with the hot-wire anemometer, concerned the intermittency factor and the frequency of zero occurrences. The intermittent flow covered most of the wake profile but for a narrow region about the axis, and was found to be normally distributed around the average front position. The latter, along with the extent of the front standard deviation, was found to agree numerically with expectations based on low speed wakes and to grow as the 13-power of axial distance. A weak periodicity of the front was detected at a wavelength about nine times greater than the longitudinal scale of turbulent velocity fluctuations. This periodicity affects the turbulent spectra.
- Fluid Mechanics