ps-LIF measurements of minor species concentration in a counterflow diffusion flame interacting with a vortex

Brockhinke, Andreas; Bülter, Andreas; Rolon, Juan-Carlos; Kohse‐Höinghaus, Katharina

doi:10.1007/s003400100535

Cited by 35 publications

(19 citation statements)

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“…[49]. In short, opposed-flow fuel-Ar/O 2 -Ar diffusion flames were established at atmospheric pressure between the two outlets of a home-built burner system [54] while regulating the respective gas flows with an absolute precision of ±0.5 % using calibrated mass flow controllers. The conditions were optimized to establish flames that provide sufficient signal for the investigated mass range up to m/z = 202 u while simultaneously avoid clogging of the sampling probe.…”

Section: Methodsmentioning

confidence: 99%

Investigating repetitive reaction pathways for the formation of polycyclic aromatic hydrocarbons in combustion processes

Hansen

Schenk

Moshammer

et al. 2017

Combustion and Flame

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Repetitive hydrogen-abstraction and methyl-and acetylene-addition reaction sequences that contribute to the formation and growth of polycyclic aromatic hydrocarbons (PAHs) during incomplete combustion processes have been analyzed in flame-sampled electron ionization mass spectra. Specifically, we analyzed the range from C 6 H 6 to C 16 H 10 in the mass spectra obtained from atmospheric-pressure opposed-flow flames fueled by n-butane, i-butane, and i-butene, with conditions identical to those chosen by Schenk et al. [Proc. Combust. Inst. 35 (2015) 1761-1769]. To assist the interpretation of the complex flame-sampled mass spectral data, this work elucidates the possibility for providing mechanistic insights from a simple analysis approach that does not convert the mass spectral data into isomer-resolved mole fraction profiles but solely is based on signal strength and ratios. While such an approach has not been exploited before, it is shown in this work that the repetitive nature of the observed quantitative signal ratios in the methyl-and acetylene-addition reaction sequences provides interesting insights into the overall features of flame-sampled mass spectra and the growth chemistry of PAHs. For the flames studied here, the similarity between the spectra obtained from the three different flames suggests that the signal ratios in the covered range are not fuel-structure dependent and that it is possible to draw mechanistic conclusions without knowing the isomer-specific chemistry. For example, the chemical growth pathways supported by this work suggest that other isomers besides pyrene contribute to the measured signal at m/z = 202 u (C 16 H 10), a result that adds concern regarding the general validity of the assumption of pyrene dimerization as the particle inception step.

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Section: Methodsmentioning

confidence: 99%

Investigating repetitive reaction pathways for the formation of polycyclic aromatic hydrocarbons in combustion processes

Hansen

Schenk

Moshammer

et al. 2017

Combustion and Flame

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“…The typically used flat-flame burner was replaced with a home-built opposed-flow atmospheric-pressure flame system [21]. Fuel and oxidizer (O 2 ) were diluted in Ar and fed separately through two opposing outlets, which are 20 mm in diameter and kept 20 mm apart.…”

Section: Gas-phase Experimentsmentioning

confidence: 99%

PAH formation and soot morphology in flames of C4 fuels

Schenk

Hansen

Vieker

et al. 2015

Proceedings of the Combustion Institute

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In this work, we describe experimental studies on the formation of polycyclic aromatic hydrocarbons (PAH's) in opposed-flow atmospheric-pressure flames of n-butane, i-butane, i-butene, and i-butanol and on the morphology of nascent soot particles sampled from premixed atmospheric-pressure flames of the same fuels. To identify the major contributors to the molecular growth mechanism in opposed-flow flames, we employed flame-sampling molecular-beam mass spectrometry with electron ionization (EI) and in situ gas-chromatography (GC) with mass spectrometric detection. The EI and GC-EI mass spectra indicate that several pathways with different building blocks can contribute to molecular growth. Besides the commonly accepted hydrogen-abstraction-C 2 H 2 -addition steps, we found reactions of the methyl radical to be important steps. This observation is also supported by the complexity of the mass spectra which indicates that at least one of the building blocks is rather small. The importance of phenyl radicals as building blocks seems to be limited. We also sampled nascent soot particles from premixed atmospheric-pressure flames of the above mentioned fuels and used helium-ion microscopy to unravel the influence of the fuel structure on the morphology of the sampled particles. While differences in flame temperatures and residence times are known to influence the particle sizes, the observed different morphologies are likely due to slightly different C/O ratios and potentially the chemical nature of the fuel.

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“…Brockhinke et al [17] measured the OH concentration distributions in the hydrogen/air opposed diffusion flame using picosecond LIF and determined the concentration distributions of H atoms by three-photon LIF in the same flame. The experimental results suggest that the peak OH concentration is about 2.5 Â 10 16 molecules/cm 3 and the peak concentration of the H atom is around at 2.1 Â 10 16 molecules/cm 3 in the stagnation surface of diffusion flame.…”

Section: Short-duration Pulsed Lifmentioning

confidence: 99%

Quantitative Planar Laser-Induced Fluorescence Technology

Yang¹,

Yu²,

Peng³

et al. 2019

Laser Technology and Its Applications

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Planar laser-induced fluorescence (PLIF) is a highly sensitive and space-time-resolved laser diagnostic technique. It is widely used in the diagnosis of combustion and flow fields to obtain the thermodynamic information of active components and interested molecules in flames. Nowadays, the PLIF technology is developing in two directions: high speed and quantification. In view of the high spatial and temporal resolution characteristics of PLIF technology that other laser diagnostics do not possess, this chapter will focus on the basic principle of laser-induced fluorescence and the current research status of quantitative PLIF technology. In addition, the advantages and disadvantages of various quantitative technologies of component concentration in flames based on laser-induced fluorescence technology are analyzed. At last, the latest works on the quantification of species concentration using planar laser-induced fluorescence in combustion are introduced.

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ps-LIF measurements of minor species concentration in a counterflow diffusion flame interacting with a vortex

Cited by 35 publications

References 0 publications

Investigating repetitive reaction pathways for the formation of polycyclic aromatic hydrocarbons in combustion processes

Investigating repetitive reaction pathways for the formation of polycyclic aromatic hydrocarbons in combustion processes

PAH formation and soot morphology in flames of C4 fuels

Quantitative Planar Laser-Induced Fluorescence Technology

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