Hydrocarbon absorption coefficients at the 339-μm He-Ne laser transition

Drallmeier, J. A.

doi:10.1364/ao.42.000979

Cited by 15 publications

(9 citation statements)

References 12 publications

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“…Experiments were performed at three total pressures: 26, 67, and 101 kPa, three equivalence ratios, Φ: 0.6, 1, and 1.2, and heating rates between 4 K/min and 14 K/min. The fuel concentration is measured by direct absorption [12,13]. A commercially available 3.39 µm HeNe laser is passed through a chopper running at 300 Hz.…”

Section: Methodsmentioning

confidence: 99%

The effect of heating rates on low temperature hexane air combustion

Boettcher

Mével

Thomas

et al. 2012

Fuel

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Combustion of hydrocarbon fuels is traditionally separated into slow reaction, cool flame, and ignition regimes based on pressure and temperature. Standard tests, such as the ASTM E659, are used to determine the lowest temperature required to ignite a specific fuel mixed with air at atmospheric pressure. It is expected that the initial pressure and the rate at which the mixture is heated also influences the limiting temperature and the type of combustion. This study investigates the effect of heating rate, between 4 and 15 K/min, and initial pressure, in the range of 25 to 100 kPa, on ignition of n-hexane air mixtures. Mixtures with equivalence ratio ranging from Φ = 0.6 to Φ = 1.2 were investigated. The problem is also modeled computationally using an extension of Semenov's classical autoignition theory with a detailed chemical mechanism. Experiments and simulations both show that in the same reactor either a slow reaction or an ignition event can take place depending on the heating rate. Analysis of the detailed chemistry demonstrates that a mixture which approaches the ignition region slowly undergoes a significant modification of its composition. This change in composition induces a progressive shift of the explosion limit until the mixture is no longer flammable. A mixture that approaches the ignition region sufficiently rapidly undergoes only a moderate amount of thermal decomposition and explodes quite violently.

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Section: Methodsmentioning

confidence: 99%

The effect of heating rates on low temperature hexane air combustion

Boettcher

Mével

Thomas

et al. 2012

Fuel

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“…In situ measurements of toluene concentration in the shock tube, providing a check on possible wall adsorption and condensation effects, were carried out using a 3.39 lm laser absorption diagnostic [22,23]. A three pass optical setup was necessary because of the low absorption coefficient of toluene.…”

Section: Methodsmentioning

confidence: 99%

Shock tube measurements of toluene ignition times and OH concentration time histories

Vasudevan

Davidson

Hanson

2005

Proceedings of the Combustion Institute

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Ignition delay times and OH radical concentration profiles were measured in toluene/O 2 /Ar mixtures behind reflected shock waves. Initial reflected shock conditions spanned 1400-2000 K and 1.5-5.0 atm, with equivalence ratios of 0.5-1.875 and toluene concentrations of 0.025-0.5%. OH time histories were monitored using narrow-linewidth ring dye laser absorption of the well-characterized R 1 (5) line of the OH A-X (0, 0) band at 306.7 nm. Ignition time data were extracted from the OH traces and were found to compare very well with measurements using sidewall pressure. These new data are in agreement with

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“…Yoshiyama et al [17] report absorption cross section for methane and propane in the temperature and pressure ranges of 285-420 K and 100-800 kPa, respectively. Drallmeier [18] measured the absorption coefficient of 2-methylbutane, n-hexane, n-heptane, iso-octane, n-nonane, n-decane, 1-hexene, toluene and o-xylene. The temperature was 295 K and the pressure ranged between 27 and 87 kPa.…”

Section: Introductionmentioning

confidence: 99%