Koban, W.; Koch, J.D.; Hanson, R.K.; Schulz, Christof:
Toluene LIF at elevated temperatures: implications for fuel-air ratio measurements
2005
In: Appl. Phys. B: Lasers Opt., Jg. 80 (2005), Heft 2, S. 147 - 150
Artikel/Aufsatz in Zeitschrift2005Maschinenbau
Titel:
Toluene LIF at elevated temperatures: implications for fuel-air ratio measurements
Autor(in):
Koban, W.; Koch, J.D.; Hanson, R.K.; Schulz, ChristofLSF
Erscheinungsjahr
2005
Erschienen in:
Titel:
Appl. Phys. B: Lasers Opt.
in:
Jg. 80 (2005), Heft 2, S. 147 - 150

Abstract:

Toluene laser-induced fluorescence (LIF) was investigated for 266- and 248-nm excitation in the temp. 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 temp., 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.