Scalar dissipation rates in high-Reymolds number turbulent nonpremixed jets have been investigated experimentally and theoretically. Both a nonreacting propane jet and a reacting jet mixture of hydrogen and argon were studied. The scalar dissipation rates were determined experimentally by using an optical multichannel analyzer to measure the instantaneous distribution of Rayleigh-scattered light along a beam from a high energy pulsed dye laser. The time-resolved spatial distribution of the conserved scalar and the local gradients were then calculated from the Rayleigh-scattered light intensity distribution. A second-order closure numerical model including the transport equations for scalar dissipation is presented. The effect of density fluctuations on the scalar dissipation is analyzed and calculations are compared with experimental results.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Fluid Flow and Transfer Processes
- Physical and Theoretical Chemistry