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

Hardi, J. and Beinke, S. and Oschwald, M. 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 , 30. Jul. – 1. Aug. 2012, 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.

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 Authors
Hardi, J.Justin.Hardi@dlr.de
Beinke, S.Scott.Beinke@dlr.de
Oschwald, M.Michael.Oschwald@dlr.de
Dally, B.University of Adelaide, South Australia
Journal or Publication Title:Proceedings
Refereed publication:Yes
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 Dates:30. Jul. – 1. Aug. 2012
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 > Raketenantriebe
Deposited By: Michaela Hanke
Deposited On:03 Nov 2012 09:18
Last Modified:03 Nov 2012 09:18

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