Acoustic pyrometry in flames

This paper investigates temperature measurement using acoustic pyrometry in hot zones and flames. For experiments in flameless hot zones, a Hartmann whistle is used as the acoustic source. Time of flight of sound waves in the heated path is calculated by cross-correlating the signals received by two microphones placed at pipe ends. Acoustic pyrometry is also performed for estimation of flame temperature in kerosene wick and candle flames, using a speaker as the acoustic source. Since length scales of single flames are small, leading to short times-of-flight, appropriate temperature profiling strategies for flame temperature estimation are identified.

► Acoustic pyrometry has been applied for measurements of flame temperatures.
► Hartmann whistle has been used for acoustic pyrometry in a hot zone.
► Single wick flame temperatures are estimated using three temperature profiles.
► Appropriate temperature profile to be used has been identified.
► Acoustic pyrometry estimates wick-flame temperature within 5%.