Accession Number:
AD0436650
Title:
ON CONVECTION VELOCITIES IN TURBULENT SHEAR FLOWS,
Descriptive Note:
Corporate Author:
ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE)
Personal Author(s):
Report Date:
1963-04-01
Pagination or Media Count:
30.0
Abstract:
It is shown how the usual approach, through properties of the space-time correlations, to the convection velocity of turbulent motions in jets and boundary layers leads to difficulties of interpretation when the flow departs from rigid convection. A more rigorous approach in terms of a wave-numbervelocity spectrum overcomes the difficulties, and allows the definition of a wave-number-dependent convection velocity that is relevant to studies of aerodynamic noise and wave generation in panels and in water. A simple experimental method for obtaining the spectrum is described, and measurements are presented for various radial positions in e shear layer of a circular jet, and for pressure fluctuations under a turbulent boundary layer. Author