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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE