Precise surface temperature measurements at kHz-rates using phosphor thermometry to study flame-wall interactions in narrow passages

Ojo, Anthony O.; Escofet-Martin, David; Abram, Christopher; Fond, Benoît; Peterson, Brian

doi:10.1016/j.combustflame.2022.111984

Cited by 11 publications

(15 citation statements)

References 50 publications

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“…7 suggest that it might be preferable to extract turbulent burning velocity based on the measurements of mean values of velocity, temperature and wall heat flux instead of predicting the mean Nusselt number based on model expressions of turbulent burning velocity. The measurement of wall heat flux in reacting gas flows is well-established in the literature [38][39][40] and this can be utilised in conjunction with the energy integral equation to estimate the turbulent burning velocity within turbulent boundary layers during FWI.…”

Section: Resultsmentioning

confidence: 99%

Energy Integral Equation for Premixed Flame-Wall Interaction in Turbulent Boundary Layers and its Application to Turbulent Burning Velocity and Wall Flux Evaluations

Ghai¹,

Ahmed²,

Klein

et al. 2022

SSRN Journal

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Section: Resultsmentioning

confidence: 99%

Energy Integral Equation for Premixed Flame-Wall Interaction in Turbulent Boundary Layers and its Application to Turbulent Burning Velocity and Wall Flux Evaluations

Ghai¹,

Ahmed²,

Klein

et al. 2022

SSRN Journal

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“…The TGP, bismuth-doped (1 mol %) scandium vanadate (ScVO4:Bi 3+ ), which was synthesized in Ref [14], is used for surface thermometry in this work. This TGP was shown to exhibit negligible dependence on excitation laser fluence [12,14], which is optimal for optically attenuating environments [12]. Figure 2a shows the room temperature emission spectrum of ScVO4:Bi 3+ .…”

Section: Phosphor Thermometrymentioning

confidence: 99%

“…Surface temperature can be derived from the phosphorescence properties of the TGP using either the spectral intensity ratio or the lifetime approach. Single-point (0-D) TGP measurements are most common for surface temperature [9][10][11][12]. Recently, 0-D phosphor thermometry was used to study FWI in a narrow passage emulating a piston crevice [12].…”

Section: Introductionmentioning

confidence: 99%

“…Single-point (0-D) TGP measurements are most common for surface temperature [9][10][11][12]. Recently, 0-D phosphor thermometry was used to study FWI in a narrow passage emulating a piston crevice [12]. Twall and FWI quantities (wall heat flux and quenching distance) were derived and referenced to the flame behavior monitored by high-speed flame imaging.…”

Section: Introductionmentioning

confidence: 99%

“…Phosphor thermometry is performed simultaneously with flame front (CH*) imaging in a narrow crevice passage of an optically accessible fixed-volume chamber (FVC). For thermometry, the TGP Bismuth-doped Scandium vanadate (ScVO4:Bi 3+ ) is used, which has a phosphorescence lifetime < 10 µs at room temperature and offers high temperature sensitivity and precision (< 0.5 K) [12,14]. Measurements describe Twall signatures associated with transient FWI events, including unique Twall features associated with wrinkled flame fronts and local wall cooling, which the latter is likely induced by hydrodynamic instabilities.…”

Section: Introductionmentioning

confidence: 99%

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High-precision 2D surface phosphor thermometry at kHz-rates during flame-wall interaction in narrow passages

Ojo¹,

Escofet-Martin²,

Peterson³

2023

Proceedings of the Combustion Institute

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Spatiotemporal Surface Temperature Measurements Resolving Flame-Wall Interactions of Lean H2-Air and CH4-Air Flames Using Phosphor Thermometry

Ojo,

Padhiary,

Peterson

2024

Flow Turbulence Combust

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Spatiotemporal wall temperature (Twall) distributions resulting from flame-wall interactions of lean H2-air and CH4-air flames are measured using phosphor thermometry. Such measurements are important to understand transient heat transfer and wall heat flux associated with various flame features. This is particularly true for hydrogen, which can exhibit a range of unique flame features associated with combustion instabilities. Experiments are performed within a two-wall passage, in an optically accessible chamber. The phosphor ScVO4:Bi3+ is used to measure Twall in a 22 × 22 mm2 region with 180 µm/pixel resolution and repetition rate of 1 kHz. Chemiluminescence imaging is combined with phosphor thermometry to correlate the spatiotemporal dynamics of the flame with the heat signatures imposed on the wall. Measurements are performed for lean H2-air flames with equivalence ratio Φ = 0.56 and compared to CH4-air flames with Φ = 1. Twall signatures for H2-air Φ = 0.56 exhibit alternating high and low-temperature vertical streaks associated with finger-like flame structures, while CH4-air flames exhibit larger scale wrinkling with identifiable crest/cusp regions that exhibit higher/lower wall temperatures, respectively. The underlying differences in flame morphology and Twall distributions observed between the CH4-air and lean H2-air mixtures are attributed to the differences in their Lewis number (CH4-air Φ = 1: Le = 0.94; H2-air Φ = 0.56: Le = 0.39). Findings are presented at two different passage spacings to study the increased wall heat loss with larger surface-area-to-volume ratios. Additional experiments are conducted for H2-air mixtures with Φ = 0.45, where flame propagation was slower and was more suitable to resolve the wall heat signatures associated with thermodiffusive instabilities. These unstable flame features impose similar wall heat fluxes as flames with 2–3 times greater flame power. In this study, these flame instabilities occur within a small space/time domain, but demonstrate the capability to impose appreciable heat fluxes on surfaces.

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Precise surface temperature measurements at kHz-rates using phosphor thermometry to study flame-wall interactions in narrow passages

Cited by 11 publications

References 50 publications

Energy Integral Equation for Premixed Flame-Wall Interaction in Turbulent Boundary Layers and its Application to Turbulent Burning Velocity and Wall Flux Evaluations

Energy Integral Equation for Premixed Flame-Wall Interaction in Turbulent Boundary Layers and its Application to Turbulent Burning Velocity and Wall Flux Evaluations

High-precision 2D surface phosphor thermometry at kHz-rates during flame-wall interaction in narrow passages

Spatiotemporal Surface Temperature Measurements Resolving Flame-Wall Interactions of Lean H2-Air and CH4-Air Flames Using Phosphor Thermometry

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