Laser-Induced Breakdown Spectroscopy on the Ignition Spark of a Cryogenic Rocket Combustion

Stützer, Robert; Börner, Michael; Oschwald, Michael

doi:10.1364/lic.2017.lfa4.2

Cited by 2 publications

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“…It reveals three major emission lines. Gref is a temperature invariant signal yet G0 and G1 change their intensities for different flame temperature values (Pellerin et al 1996;Stützer et al 2019).…”

Section: Alkali Metalsmentioning

confidence: 99%

“…9: UV-regime of the flame emission spectrum. The line Gref is temperature invariant while G1 and G0 differ in their intensity regarding flame temperature (Pellerin et al 1996;Stützer et al 2019). This characteristic behavior was applied to determine flame temperature for the combustion of EMIM SCN with a fraction of 0 wt.%, 1 wt.% and 5 wt.% Cu.…”

Section: Alkali Metalsmentioning

confidence: 99%

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Hypergolic Reaction Between Green Ionic Liquid Emim SCN and Hydrogen Peroxide in Lab-Scale Drop Test Chamber

Stützer

Lauck

Balkenhohl

et al. 2022

Int J Energetic Materials Chem Prop

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The hypergolic reaction between the recently developed green propellant combination consisting of an ionic liquid and highly concentrated hydrogen peroxide was investigated for several ratios of oxidizer and fuel, drop sizes and heights of fall. The influence of the catalytic copper additive on the ignition delay time (IDT) was analysed. Flame emission/absorption spectroscopy revealed the chemical constituents. All spectra were dominated by sodium D-lines at λ= 589nm. Further lines of alkali metals such as lithium and potassium were found. The copper additive showed its characteristic lines accordingly to its amount in the fuel. Emission spectra of the ultraviolet regime showed the characteristic OH* molecular lines around λ= 306nm with its temperature dependent intensity ratios (De Izarra 2000;Pellerin et al. 1996). The catalytic additive copper increases the flame temperature while it decreases the IDT from 31 ms for pure ionic liquid to 15 ms (5% mass fraction).

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Section: Alkali Metalsmentioning

confidence: 99%

Section: Alkali Metalsmentioning

confidence: 99%

Hypergolic Reaction Between Green Ionic Liquid Emim SCN and Hydrogen Peroxide in Lab-Scale Drop Test Chamber

Stützer

Lauck

Balkenhohl

et al. 2022

Int J Energetic Materials Chem Prop

View full text Add to dashboard Cite

show abstract

“…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%

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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Laser-Induced Breakdown Spectroscopy on the Ignition Spark of a Cryogenic Rocket Combustion

Cited by 2 publications

References 0 publications

Hypergolic Reaction Between Green Ionic Liquid Emim SCN and Hydrogen Peroxide in Lab-Scale Drop Test Chamber

Hypergolic Reaction Between Green Ionic Liquid Emim SCN and Hydrogen Peroxide in Lab-Scale Drop Test Chamber

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

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