Abstract
Toluene laser-induced fluorescence (LIF) was investigated for 266- and 248-nm excitation in the temperature range of 300–650 K in a nitrogen/oxygen bath gas of 1 bar total pressure with oxygen partial pressure in the range 0–400 mbar. Contrary to a popular assumption, the toluene LIF signal is not directly proportional to the fuel–air ratio (termed the FAR-LIF assumption) for many conditions relevant to reciprocating IC engines. With increasing temperature, a higher oxygen partial pressure is required to justify the FAR-LIF assumption. The required oxygen pressure becomes unrealistic (>5 bar) for T>670 K at 266-nm excitation and for T>625 K at 248-nm excitation.
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33.50.-j; 42.62.-b
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Koban, W., Koch, J., Hanson, R. et al. Toluene LIF at elevated temperatures: implications for fuel–air ratio measurements. Appl. Phys. B 80, 147–150 (2005). https://doi.org/10.1007/s00340-004-1715-z
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DOI: https://doi.org/10.1007/s00340-004-1715-z