Speaker
Description
Raman spectroscopy is a powerful laser-based diagnostic technique to detect various species simultaneously and analyze them quantitatively. It is often employed to study chemical species in flames where an understanding of detailed reaction mechanisms is required. However, the application has been limited to studying major species due to the weak intensities of Raman scattering signals. In this study, the detection sensitivity of the technique is enhanced by employing a multi-pass concept. Therefore, intermediate and minor species in different flames, such as formaldehyde in a DME/air flame and nitric oxide in an ammonia/air flame, respectively, are studied quantitatively. Signal enhancement by a factor of 45 is achieved with the multi-pass, and a detection limit of 40 ppm for formaldehyde is obtained. Good agreements between the measured and simulated species mole fractions and temperatures are presented, and the achievement supports employing Raman spectroscopy for flame studies under more challenging conditions.
References
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| Keywords | Laminar Flame, Combustion, Laser-based diagnostics, Multi-pass, Raman Spectroscopy |
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