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Coupling Behaviour of LOx/H2 Flames to Longitudinal and Transverse Acoustic Instabilities

Hardi, Justin and Beinke, Scott and Oschwald, Michael and Dally, B. (2012) Coupling Behaviour of LOx/H2 Flames to Longitudinal and Transverse Acoustic Instabilities. In: Proceedings. 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit , 2012-07-30 - 2012-08-01, Atlanta, Georgia, USA.

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A rectangular combustor with acoustic forcing was used to study flame-acoustic interaction under injection conditions which are representative of industrial rocket engines. Hot-fire tests using liquid oxygen and gaseous hydrogen were conducted at pressures of 40 and 60 bar, which are sub-and supercritical conditions respectively for oxygen. To our knowledge, acoustic forcing has never before been conducted at pressures this high in an oxygen-hydrogen system. Examined samples of hydroxyl-radical emission imaging, collected using a high-speed camera during periods of forced acoustic resonance, show significant response in the multi-injection element flame. Transverse acoustic velocity causes shortening of the flame, concentrating heat release near the injection plane. Fluctuating acoustic pressure causes in-phase fluctuation of the emission intensity. Based on these observations, a theorized flame-acoustic coupling mechanism is offered as an explanation for how naturally occurring high frequency combustion instabilities are sustained in real rocket engines.

Item URL in elib:https://elib.dlr.de/78227/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Coupling Behaviour of LOx/H2 Flames to Longitudinal and Transverse Acoustic Instabilities
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, South AustraliaUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:rocket engine, injection
Event Title:48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
Event Location:Atlanta, Georgia, USA
Event Type:international Conference
Event Start Date:30 July 2012
Event End Date:1 August 2012
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 - Antriebsystemtechnik - Schubkammertechnologie (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:03 Nov 2012 09:18
Last Modified:24 Apr 2024 19:44

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