Laser Raman diagnostics in subsonic and supersonic turbulent jet diffusion flames. Final Report
Ultraviolet (UV) spontaneous vibrational Raman scattering combined with laser-induced predissociative fluorescence (LIPF) is developed for temperature and multi-species concentration measurements. Simultaneous measurements of temperature, major species (H{sub 2}, O{sub 2}, N{sub 2}, H{sub 2}O), and minor species (OH) concentrations are made with a 'single' narrow band KrF excimer laser in subsonic and supersonic lifted turbulent hydrogen-air diffusion flames. The UV Raman system is calibrated with a flat-flame diffusion burner operated at several known equivalence ratios from fuel-lean to fuel-rich. Temperature measurements made by the ratio of Stokes/anti-Stokes signal and by the ideal gas law are compared. Single-shot uncertainties for temperature and concentration measurements are analyzed with photon statistics. Calibration constants and bandwidth factors are used in the data reduction program to arrive at temperature and species concentration measurements. The results of these measurements are presented, and these simultaneous measurements of temperature and multi-species concentrations allow a better understanding of the complex turbulence-chemistry interactions and provide information for the input and validation of CFD models.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (United States)
- OSTI ID:
- 5516674
- Report Number(s):
- N-91-22411; NASA-CR-188172; NAS-1.26:188172; CNN: NAG1-770
- Country of Publication:
- United States
- Language:
- English
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