High-speed 1D Raman analyzer for temperature and major species measurements in a combustion environment

Embargo End Date
2021-02-11

Type
Article

Authors
Yang, Chaobo
Tang, Hao-Ling
Magnotti, Gaetano

KAUST Department
Clean Combustion Research Center
Physical Science and Engineering (PSE) Division
Mechanical Engineering Program

Online Publication Date
2020-05-13

Print Publication Date
2020-05-15

Date
2020-05-13

Submitted Date
2020-02-11

Abstract
In this Letter, we demonstrate a 5 kHz 1D Raman instrument for temporally and spatially resolved quantitative measurements of temperature and all the major species (N2, O2, H2, and H2O) concentration in H2-air flames. The major constituents of the system are a pulse-burst laser operated at 5 kHz and four back-illuminated CCD cameras operated in subframe burst-gating mode. The use of CCD cameras allows achieving a high sampling rate with no compromise on instrument precision, but it requires one camera for each species of interest. A cascade of dichroic mirrors and bandpass filters spectrally separates the Raman signal associated with each of the four species and directs it to a separate camera. Measurements in a well-characterized H2-air premixed flat flame show that the system has precision comparable with the low-speed Raman system. The measuring uncertainty of the species mole fraction ranges between 1% (N2) and 3∼4% (O2 in lean flames). Measurements in laminar and turbulent H2/N2 jet flames show good agreement with the theoretical prediction. By measuring all species simultaneously, important combustion quantities such as the mixture fraction are also derived.

Citation
Yang, C., Tang, H., & Magnotti, G. (2020). High-speed 1D Raman analyzer for temperature and major species measurements in a combustion environment. Optics Letters, 45(10), 2817. doi:10.1364/ol.390299

Acknowledgements
King Abdullah University of Science and Technology.

Publisher
The Optical Society

Journal
Optics Letters

DOI
10.1364/OL.390299

Additional Links
https://www.osapublishing.org/abstract.cfm?URI=ol-45-10-2817

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