An analysis on coaxial jet flows using different decomposition techniques

In this study, the Fourier transform, wavelet transform and turbulence filt er methods have been applied to coaxial jet flows for various downstream po sitions in the inner and outer mixing regions. The data were obtained from cross-wire measurements,so axial and radial velocity components were acquir ed. Attention is focused on the characteristics of these signals in the ini tial region of the jet-flow field. The effects of some basic mechanisms of the vorticity dynamics on the velocity time histories, and on different sta tistical and spectral quantities, are studied. (C) 2000 Academic Press.