The latest combustion model-validation experiments are presented using a time-, space-, and polarization-resolved subframe-burst gating Raman spectroscopy system. A modification to the original subframe-burst gating diagnostics system enables parallel detection of both polarized and depolarized Raman components for the first time in a high-pressure flame tube, which permits signal detection with reduced background noise, and consequently more precise determination of temperature and species in optically harsh flames. This technique is applied to the measurement of mass fractions of the major species and temperature in a swirl-stabilized hydrogen-methane flame at an elevated pressure of 15.5 bar. The single-shot linear Raman spectra are reduced to provide quantitative multiscalar information throughout the primary reaction zone. The experimental dataset is plotted along with the laminar flamelet calculations for different Lewis numbers and strain rates to allow better interpretation. Time-dependent analysis of the recorded samples using cross correlations, probability density functions, and scatter plots reveals the characteristic behavior of the quantities over a range of mixture fractions, including the local flame structure and the influence of turbulence–chemistry interactions.
Code-Validation Scalar Measurements in High-Pressure Hydrogen-Added Methane Combustion
Journal of Propulsion and Power ; 33 , 1 ; 285-304
2016-08-25
20 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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