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Title:APPLICATION OF COHERENT ANTI-STOKES RAMAN SCATTERING THERMOMETRY IN TURBULENT AND LAMINAR FLAMES
Author(s):Satija, Aman
Contributor(s):Lucht, Robert P.; Masri, Assaad R; Gore, Jay P; Thomas, Levi Michael; Lowe, Albyn; Han, Dong; Chang, Ziqiao
Subject(s):Instrument/Technique Demonstration
Abstract:Coherent anti-Stokes Raman scattering (CARS) is a non-linear spectroscopic combustion diagnostic technique used for measurement of temperature and species concentration. Broadband CARS spectra can be acquired with a single laser shot with high spatial and temporal resolution. We present two distinct applications of a nanosecond dual-pump vibrational CARS system. The first experiment aimed to study the effect of simulated exhaust-gas-recirculation, via addition of \chem{CO_2} to the fuel stream, on the flame structure of lean \chem{CH_4}-air pilot-assisted turbulent premixed flames. For this experiment over 20,000 single-shot spectra were acquired and spectrally fitted to develop a detailed temperature map of the flame flow-field. In the second experiment, laminar flames with varying soot loading were stabilized over a “Yale burner”. This burner, in the combustion community, is a canonical system for the development of soot models. The principal challenge in this experiment was obtaining a CARS signal with an adequate signal to noise ratio in the presence of strong soot-emission background. Our measurements in both experiments will serve as benchmark data for the development of combustion computational models.
Issue Date:06/19/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100845
DOI:10.15278/isms.2018.TI05
Other Identifier(s):TI05
Date Available in IDEALS:2018-08-17
2018-12-12


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