Temperature measurements in a turbulent spray flame using NTLAF

Abstract

This paper reports the first measurements of temperature in turbulent dilute spray flames of acetone using non-linear excitation regime two-line atomic fluorescence (NTLAF), a technique well suited for temperature measurements in flames laden with particles and droplets. The NTLAF technique has previously been successful at measuring temperature in turbulent non-premixed flames of gaseous fuels in the presence of soot. Temperature is extracted from the fluorescence ratio collected of two lines of indium generated from indium chloride which is seeded into the flow. The non-linear excitation regime is exploited to improve the signal-to-noise ratio of the measurements. In the current arrangement, indium chloride is seeded with the acetone fuel and laminar premixed flames of methane are used for calibration. The preliminary results are promising and indicate that the presence of droplets does not affect the signal, making NTLAF particularly well-suited to measure temperature in turbulent, dilute spray flames.