PASSIVE SCALAR DISPERSION IN A TURBULENT MIXING LAYER

Experimental and numerical studies of spatially developed turbulent mixing layers with passive scalar concentrations was performed. In the experiment, a mixing layer was created by an S-shaped splitter plate in a wind tunnel, with a velocity ratio of 2:1. A concentration field was realized by injecting incense smoke into the high-speed side of the mixing layer. Simultaneous measurements of the velocity, vorticity and concentration fields were performed. A 12-sensor hot-wire probe was used to measure the velocity field and its gradients, while the concentration field was recorded by taking digital pictures of the laser-illuminated smoke. The statistics of the velocity and vorticity fields agree well with previous research. By synchronizing the velocity and concentration measurements, concentration fluxes were determined. Octant analysis was performed on the flux data to explore the scalar transport processes. Conditional planar average of flow properties was also performed to determine…

Author: Li, Ning

Source: University of Maryland

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