Temperature dependence of intensities of laser-induced fluorescences of ethylbenzene and naphthalene seeded in gas flow at atmospheric pressure

Hirasawa, Takashi; Kaneba, T.; Kamata, Yuichi; Muraoka, Katsunori; Nakamura, Yuji

doi:10.1007/bf03181831

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…When we consider the ultra-lean condition at which produced OH might be further decreased, then filter C with high gain is expected to work properly. Once we have other candidate for the tracer gas beyond acetone (e.g., fluorescence intensity of naphthalene is higher than acetone for 266 nm of excitation (Hirasawa et al, 2007)), the seeding amount can go further smaller. If the targeted mixture condition is fixed, we should fixed the seeding rate of tracer and apply the special designated filter whose the transmittance performance is artificially controlled.…”

Section: Effect Of Band-pass Filter and Tracer Amount On Imaging Of Fmentioning

confidence: 99%

Imaging and diagnostics of turbulent methane-air premixed flames by acetone-OH simultaneous PLIF

Nakamura

Manome

Yamashita

2008

J Vis

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A strategy of diagnostics of ultra-lean combustion based on acetone-OH simultaneous PLIF is presented. Acetone seeded in the fuel flow and combustion-generated OH work for a marker of "unburned" and "burnt" zones, respectively. Since acetone and OH does not coexist when the proper combustion takes place, the signal "valley" (dark zone) between acetone and OH fluorescence can be detected, which corresponds to flame zone; representative of the combustion status. System required for current imaging technique is one-laser and one-detector combination with "turned" band-pass filter.Transmittance characteristics of the filter and acetone-seeding rate are key issues to attain clear imaging, and we found that there is proper combination of them for that purpose. Imaging demonstration for the turbulent premixed flames shows the usefulness and applicability of this scheme on complex flame diagnostics: unique flame broken flame structure ("unburned" or "burnt" islands exist separately) are clearly obtained by this approach.

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Section: Effect Of Band-pass Filter and Tracer Amount On Imaging Of Fmentioning

confidence: 99%

Imaging and diagnostics of turbulent methane-air premixed flames by acetone-OH simultaneous PLIF

Nakamura

Manome

Yamashita

2008

J Vis

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“…Anisole (C 6 H 5 OCH 3 ) has recently been identified as a promising fluorescence tracer for fuel/air mixing studies based on laser‐induced fluorescence (LIF) . For reliable and quantitative application of anisole LIF, the photophysical properties of anisole have been investigated in detail. However, when used as a tracer, the kinetics of anisole decomposition should be known to derive reliable and quantitative quantities.…”

Section: Introductionmentioning

confidence: 99%

A Shock Tube and Modeling Study about Anisole Pyrolysis Using Time-Resolved CO Absorption Measurements

Shu

Herzler

Peukert

et al. 2017

Int. J. Chem. Kinet.

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The pyrolysis of anisole (C 6 H 5 OCH 3 ) was studied behind reflected shock waves via highly sensitive absorption measurements of CO concentration using a rotational transition in the fundamental vibrational band near 4.7 µm. Time-resolved CO mole fractions were monitored in shock-heated C 6 H 5 OCH 3 /Ar mixtures between 1000 and 1270 K at 1.3-1.6 bar. The decomposition of C 6 H 5 OCH 3 proceeds exclusively via homolytic dissociation, with reaction rate k 1 , forming methyl (CH 3 ) and phenoxy (C 6 H 5 O) radicals. The subsequent decomposition of C 6 H 5 O by ring rearrangement and bond dissociation yields CO. To determine the rate constant k 2 of C 6 H 5 O decomposition avoiding secondary reactions, allyl phenyl ether (C 6 H 5 OC 3 H 5 ) was used as an alternative source for C 6 H 5 O. Its decomposition was studied between 970 and 1170 K at ß1.4 bar. The potential-energy surface of C 6 H 5 O dissociation has been reevaluated at the G4 level of theory. Rate constants determined from unimolecular rate theory are in good agreement with the present experiments. However, the obtained rates k 2 = 9.1 × 10 13 exp(−220.3 kJ mol −1 /RT)s −1 are significantly higher than those reported before (factor 6, 2, and 1.5 faster than those data reported by Lin and Lin, J. Phys. Chem. 1986, 90, 425-431;Frank et al., 1994; Carstensen and Dean, 2012, respectively). Good agreement was found between the measured CO concentration profiles and simulations based on the mechanism of Nowakowska et al. after substituting k 2 by the value obtained from experiments on C 6 H 5 OC 3 H 5 in this work. The

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“…A number of tracer materials have been used in PLIF imaging including acetone, pentanone-3, NO 2 (Hayashida et al 1999), and rhodamine (Yamakawa et al 2001). Hirasawa et al (2007) investigated the possibility of various LIF tracers, namely, acetone, methylethylketone, acetaldehyde ethylbenzene, anisole, aniline, and naphthalene to measure the temperature profiles in a two-dimensional gas flows based on two-colour fluorescence induced by a one-colour laser. Acetone was chosen to be the LIF gas tracer in this experiment as it has been successfully utilised in gaseous flow measurement as reported by a number of sources (Lozano et al 1992;Choi et al 2002;Olsen and Willson 2002).…”

Section: Introductionmentioning

confidence: 99%

The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

Mohamad

Harrison

Jermy

et al. 2010

J Vis

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A spark plug fuel injector (SPFI), which is a combination of a fuel injector and a spark plug was developed with the aim to convert any gasoline port injection spark ignition engine to gaseous fuel direct injection (Mohamad in Development of a spark plug fuel injector for direct injection of methane in spark ignition engine. PhD thesis, Cranfield University, 2006). A direct fuel injector is combined with a spark plug using specially fabricated bracket connected to a fuel pipe and a fuel path running along the periphery of a spark plug body to deliver the injected fuel to the combustion chamber. The injection nozzle of SPFI is significantly bigger than normal direct fuel injector nozzles. Therefore, it is important to understand the effect of such a configuration on the injection process and subsequently the air-fuel mixing behaviour inside the combustion chamber. The flow was visualized using the planar laser-induced fluorescent technique. For safety reasons, nitrogen was used as fuel substitute. Nitrogen at 50, 60 and 80 bar pressure was seeded with acetone as a flow tracer and injected into a bomb containing pressurised nitrogen. Bomb pressure was varied to simulate the pressure inside combustion cylinder during the compression stroke where actual injections in engine experiments will take place. The shape and depth of tip penetration of the gas jet were measured. Results show that the gas jet follows the behaviour suggested by vortex ball model (Turner in Mechanics 13:356-369, 1962). The cone angle and the maximum jet width of the fully developed gas jets from the SPFI injection are 23°and 25 mm, respectively regardless of the injection pressures. The penetration lengths of the fully developed jets are between 90 and 100 mm at 8-14 ms after the start of injection, depending on the bomb and injection pressure. Jet penetration is directly proportional to the injection pressure but inversely proportional to the cylinder or bomb pressure. The penetration lengths indicate that sufficient distance should be travelled by the gas jet for satisfactory air-fuel mixing in the engine.

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Temperature dependence of intensities of laser-induced fluorescences of ethylbenzene and naphthalene seeded in gas flow at atmospheric pressure

Cited by 11 publications

References 8 publications

Imaging and diagnostics of turbulent methane-air premixed flames by acetone-OH simultaneous PLIF

Imaging and diagnostics of turbulent methane-air premixed flames by acetone-OH simultaneous PLIF

A Shock Tube and Modeling Study about Anisole Pyrolysis Using Time-Resolved CO Absorption Measurements

The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

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