Journal ArticleDOI
Toluene LIF at elevated temperatures: implications for fuel-air ratio measurements
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TLDR
In this paper, the authors investigated the effect of the toluene laser-induced fluorescence (LIF) signal on the fuel-air ratio of reciprocating IC engines.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.read more
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Journal ArticleDOI
Tracer-LIF diagnostics: quantitative measurement of fuel concentration, temperature and fuel/air ratio in practical combustion systems
Christof Schulz,Volker Sick +1 more
TL;DR: In this paper, the fundamental concepts for how to devise and apply quantitative measurement techniques for studies of fuel concentration, temperature, and fuel/air ratio in practical combustion systems, with some emphasis on internal combustion engines.
Journal ArticleDOI
Toluene laser-induced fluorescence for in-cylinder temperature imaging in internal combustion engines
TL;DR: In this paper, a single-laser single-camera imaging technique was demonstrated for in-cylinder temperature distribution measurements in a direct-injection internal combustion engine with homogeneous charge and yielded temperature images with a single shot precision of approximately ± 6%.
Journal ArticleDOI
Gas-phase synthesis of functional nanomaterials: Challenges to kinetics, diagnostics, and process development
TL;DR: In this article, gas-phase synthesis of nanoparticles enables production of high-purity materials with well-controlled properties in continuous flow processes, and the scale-up to pilot plant-scale based on experimentally validated simulations finally helps to prove the viability of new technologies and their application on mass markets such as materials for batteries or catalysis.
Journal ArticleDOI
Oxygen quenching of toluene fluorescence at elevated temperatures
TL;DR: Gas phase O2 quenching of toluene laser-induced fluorescence (LIF) was studied at 300-650 K in a N2/O2 bath gas of 1-bar total pressure with O2 partial pressures.
Journal ArticleDOI
Simultaneous visualization of OH, CH, CH2O and toluene PLIF in a methane jet flame with varying degrees of turbulence
TL;DR: In this article, a planar laser-induced fluorescence (PLIF) imaging of four species: OH, CH, CH2O (formaldehyde) and toluene (C6H5CH3) in methane/air jet flames was presented.
References
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Journal ArticleDOI
Measurement of temperature, fuel concentration and equivalence ratio fields using tracer LIF in IC engine combustion
TL;DR: In this paper, a technique based on planar laser-induced fluorescence of 3-pentanone for measurements of absolute concentration, temperature and fuel/air equivalence ratios in turbulent, high-pressure combustion systems such as an internal combustion engine is presented.
Journal ArticleDOI
Temperature and pressure dependences of the laser-induced fluorescence of gas-phase acetone and 3-pentanone
TL;DR: In this paper, the S1 state of acetone and 3-pentanone was studied as a function of temperature and pressure using excitation at 248 nm and 277 and 312 nm, respectively.
Journal ArticleDOI
Absorption and fluorescence of toluene vapor at elevated temperatures
TL;DR: In this paper, the authors investigated the fluorescence spectrum shifts to the red with increasing temperature and found that the vibrational structure of the absorption spectrum at ambient conditions vanishes above 600 K.
Journal ArticleDOI
Temperature and excitation wavelength dependencies of 3-pentanone absorption and fluorescence for PLIF applications
J.D. Koch,Ronald K. Hanson +1 more
TL;DR: In this article, the temperature and excitation wavelength dependencies of 3-pentanone absorption and fluorescence were studied in support of planar laser-induced fluorescence (PLIF) imaging of temperature and mixture fraction in flows of practical interest.
Journal ArticleDOI
Development and demonstration of 2D-LIF for studies of mixture preparation in SI engines
TL;DR: In this article, a two-dimensional LIF technique was applied to a spark-ignition engine and the fuel distribution at the ignition time was recorded, and the resulting images were processed and converted into fuel/air equivalence ratio using an in situ calibration technique.
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