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Thin Filament Pyrometry Field Measurements in a Medium-Scale Pool Fire.

Zhigang Wang1, Wai Cheong Tam1, Jian Chen1

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A new thin filament pyrometry method accurately measures time-varying temperatures in methanol pool fires. This technique provides detailed insights into fire dynamics and cyclic behavior.

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Area of Science:

  • Fire Science
  • Optical Diagnostics
  • Thermometry

Background:

  • Pool fires pose significant risks, necessitating accurate temperature field characterization.
  • Existing methods for measuring dynamic fire temperatures are often limited in spatial or temporal resolution.
  • Understanding transient temperature variations is crucial for fire safety and modeling.

Purpose of the Study:

  • To develop and validate a novel thin filament pyrometry technique for measuring time-varying temperature fields in pool fires.
  • To assess the spatial and temporal resolution, and uncertainty of the developed pyrometry method.
  • To analyze the dynamic structure and cyclic behavior of a medium-scale methanol pool fire.

Main Methods:

  • Utilized a digital camera with optical filters to record emission intensity from Silicon-Carbide filaments (14 µm diameter).
  • Correlated filament pixel intensity with radiation-corrected thermocouple measurements (50 µm diameter) for temperature calibration.
  • Employed statistical analysis and time-series transformation to characterize the temperature field and fire dynamics.

Main Results:

  • The thin filament pyrometry method achieved temperature measurements from 1150 K to 1900 K.
  • Achieved spatial resolution of 160 µm and temporal resolution of 0.033 s, with an uncertainty of ~150 K.
  • Revealed the cyclic nature of the pool fire, determining its dominant puffing frequency and analyzing temperature variations during different fire phases.

Conclusions:

  • Thin filament pyrometry is a viable technique for high-resolution, time-varying temperature measurements in pool fires.
  • The study provides valuable data on the dynamic structure and transient temperature fields of methanol pool fires.
  • The developed method offers improved characterization of fire behavior for safety and research applications.