Experimental Study of a Laser-Ignited Liquid Cryogenic Rocket Engine

Börner, Michael; Manfletti, Chiara; Grebe, A. K.; Gröning, Stefan; Hardi, Justin; Stützer, Robert; Suslov, Dmitry; Oschwald, Michael

doi:10.1364/lic.2015.th2a.5

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…A breakdown control probe was equipped with an optical band-pass filter for (306 ± 5) nm in order to collect the OH* emission. Further description of the combustion chamber and the test run setup can be found elsewhere (Börner et al, 2015).…”

Section: Laser Ignition Testsmentioning

confidence: 99%

“…Hence, the application of highenergy lasers becomes increasingly significant. Recently, the German Aerospace Center (DLR Lampoldshausen) made efforts towards the establishment of laser ignition using a research combustor for cryogenic propellants (Börner et al, 2015;Stützer et al, 2015Stützer et al, , 2017. The generated ignition spark, induced by a focused laser beam, reveals various physical and chemical properties at the exact place of ignition.…”

Section: Introductionmentioning

confidence: 99%

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Optical Characterization of the Laser-Induced Ignition Spark in a Cryogenic Rocket Combustor

Stützer

Börner

Oschwald

2018

Int J Energetic Materials Chem Prop

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Institute of Space Propulsion, were carried out to validate the feasibility of laser ignition on the research rocket combustor "BKA." Propellant injection in BKA was carried out via 15 coaxial injectors with liquid oxygen as oxidizer and gaseous hydrogen or gaseous methane as fuel. Crucial parameters such as the equivalence ratio between oxidizer and fuel (ROF), plasma temperature, ignition delay time, and breakdown threshold can be determined using appropriate methods for plasma analyses. The research rocket combustion chamber "Brennkammer A" (BKA) was equipped with a laser ignition facility and with the opportunity to evaluate the optical emission of the ignition spark. Furthermore, a laboratory-scale cavity, filled with well-defined samples, was used to analyze the plasma lifetime of gaseous samples of known properties. Thus, the local ROF inside the ignition kernel was derived.

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Section: Laser Ignition Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Characterization of the Laser-Induced Ignition Spark in a Cryogenic Rocket Combustor

Stützer

Börner

Oschwald

2018

Int J Energetic Materials Chem Prop

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Laser ignition of a multi-injector LOX/methane combustor

et al. 2018

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Control of Early Flame Kernel Growth by Multi-Wavelength Laser Pulses for Enhanced Ignition

Dumitrache

VanOsdol

Limbach

et al. 2017

Sci Rep

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The present contribution examines the impact of plasma dynamics and plasma-driven fluid dynamics on the flame growth of laser ignited mixtures and shows that a new dual-pulse scheme can be used to control the kernel formation process in ways that extend the lean ignition limit. We perform a comparative study between (conventional) single-pulse laser ignition (λ = 1064 nm) and a novel dual-pulse method based on combining an ultraviolet (UV) pre-ionization pulse (λ = 266 nm) with an overlapped near-infrared (NIR) energy addition pulse (λ = 1064 nm). We employ OH* chemiluminescence to visualize the evolution of the early flame kernel. For single-pulse laser ignition at lean conditions, the flame kernel separates through third lobe detachment, corresponding to high strain rates that extinguish the flame. In this work, we investigate the capabilities of the dual-pulse to control the plasma-driven fluid dynamics by adjusting the axial offset of the two focal points. In particular, we find there exists a beam waist offset whereby the resulting vorticity suppresses formation of the third lobe, consequently reducing flame stretch. With this approach, we demonstrate that the dual-pulse method enables reduced flame speeds (at early times), an extended lean limit, increased combustion efficiency, and decreased laser energy requirements.

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Experimental Study of a Laser-Ignited Liquid Cryogenic Rocket Engine

Cited by 9 publications

References 2 publications

Optical Characterization of the Laser-Induced Ignition Spark in a Cryogenic Rocket Combustor

Optical Characterization of the Laser-Induced Ignition Spark in a Cryogenic Rocket Combustor

Laser ignition of a multi-injector LOX/methane combustor

Control of Early Flame Kernel Growth by Multi-Wavelength Laser Pulses for Enhanced Ignition

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