Publication:
Time-resolved, single-ended laser absorption thermometry and H 2 O, CO 2 , and CO speciation in a H 2 /C 2 H 4 -fueled rotating detonation engine

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Authors
Cassady, Séan J.
Peng, Wen Yu
Strand, Christopher L.
Dausen, David F.
Codoni, Joshua R.
Brophy, Christopher M.
Hanson, Ronald K.
Subjects
Laser absorption spectroscopy
Rotating detonation engine
Wavelength modulation spectroscopy
Advisors
Date of Issue
2021
Date
Publisher
Elsevier
Language
Abstract
Rotating detonation engines (RDEs) require novel diagnostic tools to better understand complex detonation behavior and improve performance. To this end, a single-ended laser absorption sensor for in situ , time-resolved measurements of temperature, H 2 O, CO 2 , and CO concentrations has been developed and deployed within the annulus of a hydrogen/ethylene/air-fed RDE. With a measurement rate of 44 kS/s, the sensor delivers four co-aligned, mid-infrared laser beams into the annular detonation chamber and captures the back-reflected radiation through a single optical port. A ray-tracing optimization algorithm, designed to maximize signal-to-noise ratio and beam-perturbation tolerance, was used to determine the optimal sensor optical configuration. Wavelength-modulation spectroscopy (WMS) further compensated for interference sources in the harsh detonation environment. Time-resolved and time-averaged sensor measurements of gas temperature and species at equivalence ratios of 0.74, 0.87, and 1.03 are presented.
Type
Conference Paper
Description
The article of record as published may be found at http://dx.doi.org/10.1016/j.proci.2020.06.125
Proceedings of the Combustion Institute 38
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Other Units
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Office of Naval Research
Innovative Scientific Solution, Inc.
Department of Defense through the National Defense Science and Engineering Graduate (NDSEG)
Funder
N00014-15-P-1121
Format
9 p.
Citation
Cassady, Séan J., et al. "Time-resolved, single-ended laser absorption thermometry and H2O, CO2, and CO speciation in a H2/C2H4-fueled rotating detonation engine." Proceedings of the Combustion Institute 38.1 (2020): 1719-1727.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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