Fluorescence characteristics of the fuel tracer 1-methylnaphthalene for the investigation of equivalence ratio and temperature in an oxygen-containing environment

Retzer, Ulrich; Fink, Wolfgang; Will, Thomas; Zigan, Lars

doi:10.1007/s00340-019-7236-6

Cited by 6 publications

(21 citation statements)

References 39 publications

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“…In general, the absorption spectrum of 1-MN shows less distinct structure than that of naphthalene [11,15]. Since 1-MN is usually excited at 266 nm in tracer-LIF measurements [3][4][5]13], Fig. 3 shows the course From 350 to 800 K the peak maximum at 274 nm, shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Additional measurements are performed using a commercially available spectrometer (Ocean Optics, Ocean FX, CMOS detector, exposure time: 60 µs, slit: 50 µm, spectral resolution: 1.08 nm) to investigate the effect of the detection system on the results. More information about the LIF-Tracer 1-MN and the calibration cell can be found in references [3,5,13].…”

Section: Methodsmentioning

confidence: 99%

“…Several PAH, including naphthalene, have already been studied by using UV-VIS absorption spectroscopy [1]. Additionally, PAH such as 1-MN [2][3][4][5][6], 2-MN [4], naphthalene [6][7][8], dimethylnaphthalene [8], anthracene [9], and perylene [10] are applied as laser induced fluorescence (LIF) tracers for mixing studies in gas flows and combustion processes. The LIF technique can be used for the determination of temperature and fuel distribution, thus contributing to the optimization of the combustion process and to the reduction of pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

“…The fluorescence signals of 1-MN have been calibrated in a wide pressure and temperature range for varying mixtures with oxygen. This calibration data serves for the determination of temperature and fuel distribution using 2-color LIF and FAR-LIF (fuel-air ratio) [3,4,6,13]. However, no detailed temperature-dependent analysis of the absorption behavior has been performed yet, which is necessary to explain the observed non-monotonous fluorescence calibration functions [3].…”

Section: Introductionmentioning

confidence: 99%

“…This calibration data serves for the determination of temperature and fuel distribution using 2-color LIF and FAR-LIF (fuel-air ratio) [3,4,6,13]. However, no detailed temperature-dependent analysis of the absorption behavior has been performed yet, which is necessary to explain the observed non-monotonous fluorescence calibration functions [3]. For this purpose, the temperature dependent absorption cross section of 1-MN is analyzed from 350 to 850 K in a spectral range of 230-330 nm in this experimental study.…”

Section: Introductionmentioning

confidence: 99%

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UV absorption cross sections of vaporized 1-methylnaphthalene at elevated temperatures

et al. 2020

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In this work, the UV absorption cross sections of the fluorescence tracer 1-methylnaphthalene are determined in the range of 230-330 nm. The experiments are performed in a continuously scavenged gas flow cell, which allows for defined homogeneous conditions regarding temperature, pressure, and tracer/fuel composition. A LSDS (laser driven light source) is used for irradiation, which enables high spectral emission intensities in the UV range studied. For detection, a spectrograph in combination with an intensified camera is applied. Absorption cross sections at temperatures up to 850 K are determined and compared to sparsely available published data. Possible uncertainties caused by the optical setup and the flow cell, respectively, are considered.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UV absorption cross sections of vaporized 1-methylnaphthalene at elevated temperatures

et al. 2020

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Burst-mode 1-methylnaphthalene laser-induced fluorescence: extended calibration and measurement of temperature and fuel partial density in a rapid compression machine

2022

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In this work, tracer-based laser-induced fluorescence (LIF) with the tracer 1-methylnaphthalene is utilized to study temperature and fuel courses in a rapid compression machine (RCM) under high temperature and pressure conditions. A burst-mode Nd:YAG laser at 266 nm is applied for excitation of tracer fluorescence at a frame rate of 7.5 kHz. A high-speed intensified CMOS camera equipped with an image doubler is used for 2-color LIF (2c-LIF) thermometry. With known local temperature, the fuel partial density can be determined using the signal of the channel covering the complete LIF spectrum. Both temperature and fuel partial density are determined during the compression and expansion strokes in nitrogen and air atmospheres. For this purpose, first-time 1-MN LIF calibration measurements in air atmosphere were performed for cylinder pressures up to 2.8 MPa. This significantly extends the calibration data base generated in current calibration cells. Although the LIF signal dropped significantly due to oxygen quenching, first promising measurements of temperature and fuel partial density were conducted in the RCM at relevant equivalence ratios. The influence of the RCM driving gas pressure on the temperature course is shown for cylinder pressures up to 7.4 MPa in nitrogen atmosphere. Although the temperature and concentration fields are very homogeneous at early points in time during compression, inhomogeneities in terms of millimeter-sized hot and cold gas regions were resolved especially near top dead center (TDC) using the present approach. These structures were also visible in the fuel partial density field. These inhomogeneities are due to the heat transfer between the hot gas and the cool walls and are probably also induced by the piston movement. Especially at TDC, the minimum gas temperature is about 300 K lower than the peak temperature in the wall region of the cylinder head. These cool region temperatures are much lower than in piston engines and other RCMs reported in the literature at comparable conditions, which may due to the special design of the present layout of the machine.

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Fluorescence characteristics of organic tracer molecules for planar laser-induced fluorescence studies in internal combustion engines, part A: non-aromatics

Nayek,

Mittal

2024

Appl. Phys. B

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Fluorescence characteristics of the fuel tracer 1-methylnaphthalene for the investigation of equivalence ratio and temperature in an oxygen-containing environment

Cited by 6 publications

References 39 publications

UV absorption cross sections of vaporized 1-methylnaphthalene at elevated temperatures

UV absorption cross sections of vaporized 1-methylnaphthalene at elevated temperatures

Burst-mode 1-methylnaphthalene laser-induced fluorescence: extended calibration and measurement of temperature and fuel partial density in a rapid compression machine

Fluorescence characteristics of organic tracer molecules for planar laser-induced fluorescence studies in internal combustion engines, part A: non-aromatics

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