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Measuring the velocity field of a shear-coaxial, cryogenic flame in a high-pressure rocket thrust chamber

Son, Min and Armbruster, Wolfgang and Hardi, Justin and Oschwald, Michael (2020) Measuring the velocity field of a shear-coaxial, cryogenic flame in a high-pressure rocket thrust chamber. Proceedings of the Combustion Institute. Elsevier. doi: 10.1016/j.proci.2020.07.076. ISSN 1540-7489.

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Abstract

High-speed imaging was used to visualize one of the transcritical flames in a multi-injector, sub-scale rocket thrust chamber at pressures up to 80 bar. Image correlation velocimetry (ICV) was applied to the imaging to obtain quantitative information on the flow field from the shear-coaxial injectors. ICV was used to track surface irregularities on the liquid oxygen (LOX) jet in imaging filtered to blue wavelengths. By choosing the interrogation area carefully, only the LOX jet was effectively tracked, excluding the coaxial H2 flow, and the time-averaged velocity field was reconstructed. Due to the transient nature of the tracked features, which frequently change shape or disappear, the averaged ICV result underestimates the absolute values of velocity. Therefore, the averaged values were scaled by the mean of the instantaneous velocity maxima. A second, reference measurement of LOX jet propagation speed was calculated using dynamic mode decomposition (DMD). The results were consistent following the aforementioned correction of the ICV values. Comparing the ICV fields for two different operating conditions showed a marked difference in the axial velocity distribution and lateral expansion of the LOX jet, demonstrating the potential of the method in studying injection in rocket combustion chambers.

Item URL in elib:https://elib.dlr.de/137723/
Document Type:Article
Title:Measuring the velocity field of a shear-coaxial, cryogenic flame in a high-pressure rocket thrust chamber
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Son, MinUNSPECIFIEDhttps://orcid.org/0000-0003-3182-0637UNSPECIFIED
Armbruster, WolfgangUNSPECIFIEDhttps://orcid.org/0000-0002-4859-4173UNSPECIFIED
Hardi, JustinUNSPECIFIEDhttps://orcid.org/0000-0003-3258-5261UNSPECIFIED
Oschwald, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-9579-9825UNSPECIFIED
Date:2020
Journal or Publication Title:Proceedings of the Combustion Institute
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1016/j.proci.2020.07.076
Publisher:Elsevier
ISSN:1540-7489
Status:Published
Keywords:Liquid rocket engine; Transcritical injection; Flame visualization; Image correlation velocimetry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Reusable Space Systems and Propulsion Technology
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:19 Nov 2020 08:24
Last Modified:23 Oct 2023 14:13

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