Accession Number:

ADA582055

Title:

Spatio-Temporal Characteristics of Scalar Mixing and Dissipation Processes in Turbulent Jets and Flames

Descriptive Note:

Final rept. 15 Mar 2009-27 May 2012

Corporate Author:

OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

2012-11-20

Pagination or Media Count:

25.0

Abstract:

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.

Subject Categories:

  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE