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The Hyperfine Structure of the OH* Emission Spectrum and its Benefits for Combustion Analysis

Stützer, Robert and Oschwald, Michael (2019) The Hyperfine Structure of the OH* Emission Spectrum and its Benefits for Combustion Analysis. In: Proceedings of the 8th European Conference for Aeronautics and Space Sciences. 8th European Conference for Aeronautics and Space Sciences EUCASS, 1. - 4. Jul. 2019, Madrid, Spain. DOI: 10.13009/EUCASS2019-839

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Abstract

The hyperfine structure of the OH radical emission spectrum was used to derive hydrogen flame temperatures in a research rocket combustor. A spectral resolution of less than 1nm was realized, revealing single molecular emission lines. Hence, relative intensities of several emission lines in the ultraviolet regime were investigated regarding temperature. Two groups of lines were used in order to correlate values of heat release with band intensities. Using an optically accessible diagnostic element, optical fiber, and a high-resolution spectrograph, measurements were conducted during LOX/gH2 combustion runs at the European research test bench P8. The feasibility of line-of-sight flame temperature measurements in the vicinity of the injector element was shown. Temperature values of (3200±200)K were determined. Experimentally obtained values are in good agreement with simulation data.

Item URL in elib:https://elib.dlr.de/130536/
Document Type:Conference or Workshop Item (Speech)
Title:The Hyperfine Structure of the OH* Emission Spectrum and its Benefits for Combustion Analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stützer, RobertRobert.Stuetzer (at) dlr.dehttps://orcid.org/0000-0003-4136-8496
Oschwald, MichaelMichael.Oschwald (at) dlr.dehttps://orcid.org/0000-0002-9579-9825
Date:2019
Journal or Publication Title:Proceedings of the 8th European Conference for Aeronautics and Space Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.13009/EUCASS2019-839
Status:Published
Keywords:Flame Emission, Flame Emission Spectroscopy, Combustion, OH*
Event Title:8th European Conference for Aeronautics and Space Sciences EUCASS
Event Location:Madrid, Spain
Event Type:international Conference
Event Dates:1. - 4. Jul. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Antriebsystemtechnik - Schubkammertechnologie
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion
Deposited By: Hanke, Michaela
Deposited On:18 Nov 2019 09:22
Last Modified:18 Nov 2019 09:22

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