Spatio-Temporal Characteristics of Scalar Mixing and Dissipation Processes in Turbulent Jets and Flames
Final rept. 15 Mar 2009-27 May 2012
OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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The research objective of this program is to investigate the time-varying dynamics of scalar mixing relevant to turbulent reacting flows. Specifically, the program targeted the development and application of a new class of high-repetition-rate laser-based diagnostics to measure the time-varying mixture fraction, temperature, and species concentration fields in turbulent non-reacting jets and non-premixed flames. The result of the program was five new high-speed imaging techniques that were previously unavailable. High-speed planar Rayleigh scattering was developed to measure mixture fraction and temperature fields in turbulent jets and flames high-speed spontaneous Raman scattering was developed to measure the temporal development of major species concentrations and the mixture fraction in reacting flows and high-speed CH and CH2O PLIF were developed to monitor the time-varying, two-dimensional field of combustion intermediate and radicals with varying levels of reactivity. Targeted applications include understanding the time-dependent interaction between the large-scale turbulence and the small-scale mixing and species proproductiondestruction and the support of large-eddy simulation LES as a method of modeling time-varying turbulent combustion by providing new temporally-based visualization and statistical metrics for assessing model performance.
- Combustion and Ignition