Three-wavelength pyrometer for measuring flame temperatures

Area of Science:

• Combustion science
• Optical diagnostics
• Thermometry

Background:

• Accurate measurement of particle temperatures in dynamic combustion events like explosions is crucial for understanding energy release and safety.
• Existing methods may have limitations in capturing transient, high-temperature phenomena.

Purpose of the Study:

• To develop and validate a pyrometer system for measuring particle temperatures in flames and explosions.
• To apply the pyrometer to study temperature profiles during coal dust explosions.

Main Methods:

• A pyrometer was designed to measure continuum radiation from particles at three specific wavelengths (0.8, 0.9, and 1.0 micrometers).
• Particle temperatures were calculated using the Planck equation based on the emitted radiation.
• The pyrometer was employed in experiments involving coal dust explosions within a closed vessel.

Main Results:

• The pyrometer successfully measured particle radiation at the selected wavelengths.
• Temperature data from coal dust explosions were obtained and are presented in the study.
• The application of Planck's equation allowed for the calculation of particle temperatures.

Conclusions:

• The developed multi-wavelength pyrometer is effective for determining particle temperatures in combustion events.
• The findings provide valuable temperature data for coal dust explosions, contributing to combustion modeling and safety assessments.