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Interaction of LOX/GH2-Spray Combustion with Acoustics

Knapp, Bernhard and Farago, Zoltan and Oschwald, Michael (2007) Interaction of LOX/GH2-Spray Combustion with Acoustics. 45th Aerospace Sciences Meeting, 2007-01-09, Reno, NV (USA).

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Abstract

The response of a cryogenic LOX/H2-spray flame to acoustic pressure and velocity fluctuations has be investigated experimentally for pressure levels up to p=1MPa. The dimensions of the combustion chamber are chosen to have transversal acoustic modes at eigenfrequencies representative to full scale rocket combustors. A siren wheel periodically opening a secondary nozzle was used to excite pressure oscillations in the cylindrical combustor at levels up to p'/p~10%. It has been found that the secondary nozzle detunes the eigenfrequencies of the cylindrical resonator in a characteristic way. A 2D-modal analysis of the acoustic behavior of the resonance volume has been done and results agree very well with the experimental findings. By analyzing the temporal and spatial distribution of the flame response to the acoustic excitation the question is addressed whether there is a coupling of combustion and acoustics and whether this coupling is due to velocity or pressure sensitive processes. From the experimental data it is concluded that there is a positive coupling, and the coupling is due to pressure sensitive processes.

Item URL in elib:https://elib.dlr.de/53080/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Interaction of LOX/GH2-Spray Combustion with Acoustics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knapp, BernhardUNSPECIFIEDUNSPECIFIED
Farago, ZoltanUNSPECIFIEDUNSPECIFIED
Oschwald, MichaelUNSPECIFIEDUNSPECIFIED
Date:January 2007
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:combustion instability, rocket propulsion, acoustics
Event Title:45th Aerospace Sciences Meeting
Event Location:Reno, NV (USA)
Event Type:international Conference
Event Dates:2007-01-09
Organizer:AIAAA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Antriebsystemtechnik - Schubkammertechnologie und Hochdruckverbrennung (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Oschwald, Dr.rer.nat. Michael
Deposited On:29 Jan 2008
Last Modified:31 Jul 2019 19:21

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