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The Evolving Temperature Field in a 1 m Methanol Pool Fire.

Jian Chen¹, Kunhyuk Sung², Zhigang Wang³

¹Center for Offshore Engineering and Safety Technology, China University of Petroleum (East China), Qingdao, China.

Journal of Fire Sciences

|April 29, 2024

Summary

Thin filament pyrometry measured temperature fields in methanol pool fires. This technique provides quantitative insight into the complex structure of turbulent fires.

Keywords:

methanol pool fires temperature field measurements thin filament pyrometry

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Area of Science:

Fire Science
Thermometry
Fluid Dynamics

Background:

Accurate temperature measurement is crucial for understanding fire dynamics.
Turbulent fires exhibit complex, time-varying temperature fields.
Traditional methods may struggle with the dynamic nature of fire environments.

Purpose of the Study:

To develop and validate a thin filament pyrometry technique for measuring time-varying temperature fields in a methanol pool fire.
To correlate optical emission intensity with thermocouple temperature measurements.
To analyze the dynamic structure of turbulent fires.

Main Methods:

Utilized a 1-meter methanol pool fire.
Employed an array of 12-micrometer Silicon-Carbide filaments and a digital camera for optical emission intensity.
Used a 50-micrometer diameter thermocouple for temperature validation.
Developed correlations between corrected thermocouple data and pixel intensity using regression analysis.

Main Results:

Established a correlation between thermocouple measurements and filament grayscale pixel intensity.
Determined local mean temperature and variance from regression analysis.
Transformed time-series temperature data into phase-averaged values corresponding to fire puffing cycles.

Conclusions:

Thin filament pyrometry is a viable method for measuring dynamic temperature fields in pool fires.
The study provides quantitative insights into the structure of turbulent fire dynamics.
Phase-averaging reveals temperature variations during different fire cycle phases.