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

Anthony O. Ojo*, David Escofet-Martin, Christopher Abram, Benoit Fond, Brian Peterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The thermographic phosphor ScVO4:Bi3+ is used to obtain time-resolved surface temperature measurements with sub-oC precision at 5 kHz. Measurements are used to study transient heat loss and flame-wall interactions (FWI) within a dedicated narrow two-wall passage (crevice) in an optically accessible fixed volume chamber. This passage emulates a crevice relevant in many technical environments, where FWI is less understood due to lack of detailed measurements. Chemiluminescence (CH*) imaging is performed simultaneously with phosphor thermometry to resolve how the flame’s spatiotemporal features influence the local surface temperature. ScVO4:Bi3+ is benchmarked against Gd3Ga5O12:Cr,Ce, a common phosphor used at low-kHz rates in FWI environments. ScVO4:Bi3+ is shown to offer higher luminescence signal levels and temperature sensitivity as well as negligible cross dependence on the excitation laser fluence, improving the precision and repeatability of the wall temperature measurement. ScVO4:Bi3+ is further used to resolve transient heat loss for variations in crevice spacing and uniquely capture temperature transients associated with flame dynamics. Taking advantage of these precise surface temperature measurements the wall heat flux is calculated with crevice spacing of 1.2 mm, where flame extinction is prevalent. Wall heat flux and estimated quenching distance are reported for flames that actively burn or extinguish at the measurement location.
Original languageEnglish
Article number111984
Number of pages13
JournalCombustion and Flame
Volume240
Early online date18 Jan 2022
DOIs
Publication statusPublished - 30 Jun 2022

Keywords / Materials (for Non-textual outputs)

  • Phosphor thermometry
  • Flame-wall interaction
  • two-wall passages
  • flame quenching

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