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|
|Journal or Publication Title:||Proceedings|
|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:||Raumfahrt|
|HGF - Program Themes:||R RP - Raumtransport|
|DLR - Research area:||Raumfahrt|
|DLR - Program:||R RP - Raumtransport|
|DLR - Research theme (Project):||R - Antriebsystemtechnik - Schubkammertechnologie|
|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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