Michael Börner

Influence of Combustor Unsteadiness on the Aerothermal Load of a High-Pressure Turbine Stage Using Scale-Resolving Computational Fluid Dynamics Simulations

Nico Rademacher, Anton Hilfrich, Knut Lehmann, Michael Börner et autres

Abstract Aerothermal interaction between the combustor and the high-pressure turbine is critical for engine efficiency. Standard steady-state methods fail to capture the highly unsteady flow features at the combustor–turbine interface, leading to uncertainties in thermal load prediction. This study investigates the influence …

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High-frequency combustion instability mechanism of a liquid oxygen/methane swirl coaxial injector in an optically accessible chamber

Alexander Bee, Michael Börner, Jan Martin, Wolfgang Armbruster et autres

Injector elements are an elemental sub-component of any liquid rocket engine, as they are critical in influencing engine efficiency and combustion stability. Therefore, characterizing such elements is of great importance. In regeneratively cooled rocket engines, significant changes in fuel injection temperature can …

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Modelling thermoacoustic stability of cryogenic rocket engines with novel acoustic network model elements

Nicolás de Jong Cantariño, Wolfgang Armbruster, Justin Steven Hardi, Michael Börner et autres

Reliable and computationally efficient prediction capabilities for combustion instabilities in liquid propellant rocket combustion chambers are still rare. This study uses a low-order tool based on the well-known acoustic network model principle to map the stability limits of two different research rocket …

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Forecasting thermoacoustic instabilities across domains using domain adversarial neural networks

David Baldsiefen, Jan Martin, Michael Börner, Justin Hardi et autres

The occurrence of combustion instabilities poses a high risk to the safe operation of liquid propellant rocket engines. Forecasting such instabilities in real-time is an active field of research, as it would allow the engine operator to initiate emergency procedures during testing …

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LES Validation and Analysis of Unstable Liquid Rocket Engines at Super- and Subcritical Pressures

Giulio Pelenghi, Thomas Schmitt, Nicolas Odier, Jan Martin et autres

International audience

Forecasting thermoacoustic instabilities across domains using domain adversarial neural networks

David Baldsiefen, Jan Martin, Michael Börner, Justin Hardi et autres

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Characterization of a LOX/natural gas liquid-centered swirl coaxial injector element in an optically accessible combustion chamber

Alexander Bee, Michael Börner, Jan Martin, Wolfgang Armbruster et autres

Despite the fact that swirl coaxial injector elements are a popular choice in the design of LOX/methane liquid rocket engines, there is still a distinct lack of experimental studies optically evaluating their behavior under hot-fire conditions. Such optical data is essential for …

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Influence of Injector and Chamber Design on LOX/CH4 Combustion Instabilities

Jan Martin, Wolfgang Armbruster, Michael Börner, Justin Steven Hardi et autres

A shear-coaxial element is a prominent choice in terms of injection technology for bipropellants with a high density ratio. While this type of injector performed well for liquid-oxygen and hydrogen combustion in an optically accessible single-element combustor and a multi-injector thrust chamber, …

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Design and testing of a hydrogen–oxygen pre-detonator for rotating detonation engines

Wolfgang Armbruster, Ewen Bard, Stéphane Boulal, Michael Börner et autres

Abstract Rotating Detonation Engines (RDEs) have the potential to significantly increase the performance of liquid-propellant rocket engines. Besides, they are also a promising improvement for gas turbine combustors. Therefore, there is a rapidly growing interest world-wide into this technology. One critical aspect …

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Hysteresis-Induced Onset and Progressive Decay of Periodic and Metastable Sheet Cavitation in a Chamfered Circular Orifice

Min Son, Michael Börner, Wolfgang Armbruster, Justin Steven Hardi

This study investigates the onset and decay mechanisms of sheet cavitation within a chamfered orifice under turbulent conditions, using high-speed backlight imaging for detailed frame-by-frame analysis. A distinctive metastable sheet cavitation regime was identified, distinguished by its unique hysteresis behavior during onset …

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Influence of Injector and Chamber Geometry on the Thermoacoustic Behaviour in Proximity to the Stability Boundary of LOX/CH4 Rocket Combustors

Jan M. L. Martin, Wolfgang Armbruster, Michael Börner, Justin Steven Hardi et autres

A shear-coaxial-element is a prominent choice in terms of injection technology for bipropellants with a high density ratio. While this type of injector performed well for liquid-oxygen and hydrogen combustion in an optically accessible single-element combustor and a multi-injector thrust chamber, the …

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NUMERICAL INVESTIGATION OF SUPERCRITICAL LOX/METHANE CRYOGENIC COMBUSTION IN A ROCKET COMBUSTION CHAMBER

Jan van Schyndel, Miguel Martin Benito, Bruno Vieille, Michael Börner et autres

This paper presents simulation activities performed in the frame of a partnership program between the German Aerospace Center (DLR) and the launcher directorate of the French National Center for Space Studies (CNES). The specific test case presented in this paper is a …

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