Abstract
Simultaneous planar Rayleigh scattering and laser-induced fluorescence (LIF) yields three-dimensional scalar and scalar dissipation rate field information in a planar turbulent jet. The conserved scalar used here is the jet fluid concentration, where the jet consists of propane, which serves as the primary Rayleigh scattering medium, seeded with acetone for fluorescence. The use of different imaging techniques for the two distinct spatial planes leads to higher signal levels than would, for example, a two-plane Rayleigh scattering technique. Quantification of the errors incurred hi differentiati ng between distinct planes is obtained by investigating the discrepancy between the Rayleigh scattering and acetone fluorescence signals as measured in a single spatial plane. Results for the three-dimensional scalar gradient allow investigation of the full scalar energy dissipation rate field. The lognormality of the dissipation rate is verified, and the dissipation layer thicknesses follow the expected -3/4 power law dependence on Reynolds number. However, the dependence of layer thickness on certain large scale flow properties appears to be at odds with previous results obtained using single-point scalar concentration measurements.
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