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Flame response to acoustic excitation in a rectangular rocket combustor with LOx/H2 propellants

Hardi, Justin and Oschwald, Michael and Dally, B. (2011) Flame response to acoustic excitation in a rectangular rocket combustor with LOx/H2 propellants. CEAS Space Journal, Vol. 2 (1 - 4). Springer. doi: 10.1007/s12567-011-0020-z.

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Research efforts are currently underway at the German Aerospace Center (DLR) Lampoldshausen, which aim to understand the mechanisms by which self-sustaining oscillations in combustion chamber pressure, known as high frequency combustion instabilities, are driven. Testing has been conducted in the rectangular combustor ‘BKH’, running cryogenic oxygen and hydrogen propellants under pressure and injection conditions which are representative of real rocket engines and with acoustic forcing. For the first time, such tests with LOx/H2 propellants and acoustic forcing have been conducted at combustion chamber pressures above 10 bar, the reported results herein from a test at 42 bar. Optical access to the combustor allowed the application of high speed hydroxyl radical (OH*) chemiluminescence imaging of the flame during periods of forced excitation of acoustic resonance modes of the combustion chamber. This paper reports the investigation of flame response to acoustic excitation. Both fluctuation in OH* emission intensity and deflection of the flame at frequencies corresponding to the excitation frequency have been observed. These responses are then discussed as potential indicators of driving mechanisms for combustion instabilities.

Item URL in elib:https://elib.dlr.de/72123/
Document Type:Article
Title:Flame response to acoustic excitation in a rectangular rocket combustor with LOx/H2 propellants
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hardi, JustinUNSPECIFIEDhttps://orcid.org/0000-0003-3258-5261UNSPECIFIED
Oschwald, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-9579-9825UNSPECIFIED
Dally, B.University of Adelaide, AustraliaUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 2
Keywords:combustion instabilities, liquid propellant rocket engines, coaxial spray and flame, flame imaging
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 > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:30 Nov 2011 10:58
Last Modified:14 Dec 2019 04:27

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