title: Effect of large-scale intermittency and mean shear on scaling-range exponents in a turbulent jet.
abstract: The present study investigates the combined impact of the intermittency associated with the turbulent-nonturbulent interface and the mean shear rate in an axisymmetric jet on the structure of turbulence in the scaling range, where the spectrum exhibits a power-law behavior. Second-order structure functions, autocorrelations of the dissipation rate, and spectra of both the longitudinal velocity fluctuation and the passive temperature fluctuation are measured at a distance of 40 diameter downstream from the nozzle exit. All the scaling range exponents are influenced by the large-scale intermittency and the mean shear. The scalar fluctuation is much more sensitive to the variation in large-scale intermittency than the velocity fluctuation.
authors.affiliation: Department of Mechanical Engineering, University of Adelaide, SA 5005, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Mi
authors.forename: R A
authors.initials: RA
authors.lastname: Antonia