Mapping of Energy Cascade in the Developing Region of a Turbulent Round Jet

Abstract

Due to practical limitations for conducting measurements in the most interesting, yet difficult flow regions with high shear and turbulence intensities, developing turbulence has been under-explored. These limitations have impaired the ability to properly test the critical assumptions of existing turbulence theory. This paper describes experimental works for acquiring velocity data points and resolving higher order moments of velocities, which may reveal interesting nonequilibrium features of the flow. The measurements presented herein provide a uniquely accurate measurement database of a canonical high shear and high intensity turbulent flow that can serve as a baseline for further theoretical and modelling developments.

Similarity scaling of the axisymmetric turbulent jet

“…Additionally, the linearly expanding conical shape of the jet, defined, e.g., by its half velocity contour, and a virtual origin a few jet diameters downstream from the jet orifice have been verified by experiments. Careful LDA measurements of second order dynamic moments, such as velocity power spectrum, correlation function, and second order structure function, have nicely supported similarity for these quantities in the inertial subrange, also in parts of the developing region (Yaacob et al, 2021).…”