Advanced laser diagnostics for an improved understanding of premixed flame-wall interactions

Dreizler, Andreas; Böhm, Benjamin

doi:10.1016/j.proci.2014.08.014

Cited by 172 publications

(67 citation statements)

References 175 publications

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“…Flame quenching has been studied extensively for various parameters such as pressure 1 , temperature of the gas 2 , equivalence ratio 2 , wall temperature and material 3 , and orientation of the surface, compared to the flame propagation 4,5 . The physical mechanisms responsible for flame quenching are heat loss to the surface and wall quenching of radicals.…”

Section: Introductionmentioning

confidence: 99%

Flame Quenching Dynamics of High Velocity Flames in Rectangular Cross-section Channels

Mahuthannan

Lacoste

Damazo

et al. 2017

55th AIAA Aerospace Sciences Meeting

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Understanding flame quenching for different conditions is necessary to develop safety devices like flame arrestors. In practical applications, the speed of a deflagration in the labfixed reference frame will be a strong function of the geometry through which the deflagration propagates. This study reports on the effect of the flame speed, at the entrance of a quenching section, on the quenching distance. A 2D rectangular channel joining two main spherical vessels is considered for studying this effect. Two different velocity regimes are investigated and referred to as configurations A, and B. For configuration A, the velocity of the flame is 20 m/s, while it is about 100 m/s for configuration B. Methane-air stoichiometric mixtures at 1 bar and 298 K are used. Simultaneous dynamic pressure measurements along with schlieren imaging are used to analyze the quenching of the flame. Risk assessment of re-ignition is also reported and analyzed.

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Section: Introductionmentioning

confidence: 99%

Flame Quenching Dynamics of High Velocity Flames in Rectangular Cross-section Channels

Mahuthannan

Lacoste

Damazo

et al. 2017

55th AIAA Aerospace Sciences Meeting

View full text Add to dashboard Cite

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“…According to the relative position relation between flame propagation direction and wall surface, wall quenching can be divided into two types: head-on quenching (HOQ), where flame propagation is perpendicular to the wall, and side-wall quenching (SWQ), where the flame burns parallel to the wall [11]. Boust et al [12] ignited a quiescent methane-air mixture by spark electrodes in a constant-volume vessel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wall Temperature on Acetylene Diffusion Flame–Wall Interaction Based on Optical Diagnostics and CFD Simulation

et al. 2018

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Abstract:In order to elucidate the effect of wall temperature on a diffusion flame-wall interaction, an acetylene diffusion flame in a head-on quenching type was investigated. Direct photography, two-color thermometry, soot-LII (laser-induced incandescence), OH-LIF (laser-induced fluorescence) and numerical simulation with detailed reaction mechanisms were employed to find out the influence mechanism of wall temperature on near-wall combustion performance and emission characteristics. It is clearly shown through optical diagnostics and computation fluid dynamics (CFD) simulation that, compared with cold wall, the high temperature zone for hot wall becomes wider, and the smaller quenching layer is formed due to the higher wall heat flux. High-concentration soot emission is formed primarily near the outer flame far from the wall. CH 2 O, CO and HC emissions are decreased as wall temperature rises, while the formation of soot and A 4 is increased. A diffusion flame-wall interaction structure is proposed to reveal the influence mechanism of wall temperature.

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“…Thermal efficiency improvement is crucial but limited by the thermal resilience of nozzle guide vanes used in gas turbines (Lefebvre 1999;Facchini et al 2004;Duchaine et al 2009;Berger et al 2016). Moreover, the compactness of future systems is likely to enhance material stresses (Dreizler and Bohm 2015). The development of new materials that can withstand higher temperatures, raises the need to better understand their behavior in a combustion environment (Padture et al 2002;Hooker and Doorbar 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Wall temperature measurements in combustion systems are therefore mandatory but remain challenging due to the high-temperature and corrosive environment (Dreizler and Bohm 2015). Classical thermometry techniques suffer from several drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Phosphor thermometry on a rotating flame holder for combustion applications

et al. 2018

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. AbstractThis study presents a method to measure wall temperatures of a rotating flame holder, which could be used as a combustion control device. Laser-induced phosphorescence is found to be a reliable technique to gather such experimental data. The paper first investigates how the coating (thickness, emissivity and lifetime) influence the flame stabilization. While the low thermal conductivity of the coating is estimated to induce a temperature difference of only 0.08-0.4 K, the emissivity increases by 40% . Nevertheless, the transient and steady-state flame locations are not affected. Second, because temperature measurements on the rotating cylinder are likely to fail due the long phosphor lifetimes, we modify the classical point-wise arrangement. We propose to illuminate a larger area, and to correct the signal with a distortion function that accounts for the displacement of the target. An analytical distortion function is derived and compared to measured ones. It shows that the range of measurements is limited by the signal extinction and the rapid distortion function decay. A diagram summarizes the range of operating conditions where measurements are valid. Finally, these experimental data are used to validate direct numerical simulations. Cylinder temperature variations within the precision of these measurements are shown not to influence the flame location, but larger deviations highlight different trends for the two asymmetric flame branches.

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Advanced laser diagnostics for an improved understanding of premixed flame-wall interactions

Cited by 172 publications

References 175 publications

Flame Quenching Dynamics of High Velocity Flames in Rectangular Cross-section Channels

Flame Quenching Dynamics of High Velocity Flames in Rectangular Cross-section Channels

Effect of Wall Temperature on Acetylene Diffusion Flame–Wall Interaction Based on Optical Diagnostics and CFD Simulation

Phosphor thermometry on a rotating flame holder for combustion applications

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