Abstract
A robust and relatively compact calibration-free thermometric technique using diode lasers two-line atomic fluorescence (TLAF) for reactive flows at atmospheric pressures is investigated. TLAF temperature measurements were conducted using indium and, for the first time, gallium atoms as temperature markers. The temperature was measured in a multi-jet burner running methane/air flames providing variable temperatures ranging from 1600 to 2000 K. Indium and gallium were found to provide a similar accuracy of ~ 2.7% and precision of ~ 1% over the measured temperature range. The reliability of the TLAF thermometry was further tested by performing simultaneous rotational CARS measurements in the same experiments.
Highlights
Thermometric techniques that provide accurate and precise temperature measurements in reactive flows are crucial for the understanding of combustion processes, development of efficient combustion devices and improvement of kinetic modeling
We investigate indium and, for the first time, gallium as temperature markers for two-line atomic fluorescence, in regards to accuracy and precision over temperatures ranging from 1500 K up to 2000 K
two-line atomic fluorescence (TLAF) temperature measurements at different equivalence ratios for the two atomic species are compared to Coherent anti-Stokes Raman Spectroscopy (CARS) temperature measurements and the accuracy and precision of the TLAF technique are evaluated
Summary
Thermometric techniques that provide accurate and precise temperature measurements in reactive flows are crucial for the understanding of combustion processes, development of efficient combustion devices and improvement of kinetic modeling. Thermometric techniques providing accurate measurements with good spatial resolution and, with the ability to map the temperature field in turbulent flows are highly demanded. TLAF measurement has been extended from the linear regime to non-linear regime by Medwell et al [4] and to the saturation regime by Manteghi et al [14] in an attempt to maximize the fluorescence signal for instantaneous temperature measurements. With the improvement in regards to available power and wavelengths of diode lasers, TLAF measurements using diode lasers have been shown to give accurate temperatures in both low-pressure and atmospheric
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