Comparative behavior of piloted turbulent premixed jet flames of C 1 C 8 hydrocarbons

Carbone, Francesco; Smolke, Jennifer; Fincham, Adam; Egolfopoulos, Fokion N.

doi:10.1016/j.combustflame.2017.02.030

Cited by 23 publications

(23 citation statements)

References 36 publications

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“…Tambold et al [20] showed that alcohol flames blow-off at higher equivalence ratios than methane. Carbone et al [21] observed changes in global properties of the flame with complex fuels and suggested re-examining their scaling parameters. Additionally, it was observed in Refs.…”

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confidence: 99%

“…Additionally, it was observed in Refs. [20,21] that flames with a high Lewis number ( ) are more susceptible to extinction than those with a low .…”

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confidence: 99%

“…Figure 1b shows a schematic of the vapouriser, which is a scaled-up version of the one employed in Ref. [21]. The vapouriser is designed to provide a maximum airflow rate of 1000 standard litres per minute at a temperature of 413 K. The inlet air is heated using four inline air heaters, and the power of the heaters was controlled via a proportional-integral-derivative (PID) controller.…”

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confidence: 99%

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Lean Blow-Off Scaling of Turbulent Premixed Bluff-Body Flames of Vaporized Liquid Fuels

Pathania

Skiba

Sidey-Gibbons

et al. 2021

Journal of Propulsion and Power

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The lean blow-off (LBO) limits and structure of turbulent premixed flames were investigated with vapourised liquid fuels stabilized by a bluff-body burner. Ethanol, heptane, and two kerosenes were used. In order to facilitate comparisons to gaseous-fueled flames, results were also obtained from methane flames. The measured LBO limits indicate that, for this burner, the ethanol and heptane flames are more resilient to blow-off than the kerosene fuels. Furthermore, a correlation based on a Damköhler number (Da), which is proportional to the laminar flame speed, does not lead to the successful collapse of the different fuels, indicating that the Da correlations based on laminar flame speed is not applicable. Average OH* chemiluminescence images of the ethanol and heptane flames are qualitatively similar to that from methane: the flame brushes of both exhibit an M-shape when close to blow-off. In contrast, the distribution of OH* signal in the kerosene flames is primarily concentrated in regions further downstream of the bluff body. Ultimately, the results of this effort highlight the influence fuel-type has on the LBO of bluff-body stabilized flames. Moreover, this work indicates the LBO behavior of flames produced with complex hydrocarbon fuels cannot be fully understood via high-temperature chemistry concepts such as the laminar flame speed. Turbulent premixed combustion, blow-off scaling, Vapourise kerosene

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confidence: 99%

“…Additionally, it was observed in Refs. [20,21] that flames with a high Lewis number ( ) are more susceptible to extinction than those with a low .…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Lean Blow-Off Scaling of Turbulent Premixed Bluff-Body Flames of Vaporized Liquid Fuels

Pathania

Skiba

Sidey-Gibbons

et al. 2021

Journal of Propulsion and Power

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“…More recently, significant activity on high Karlovitz number premixed flames [3,[13][14][15][16][17] is revealing local information on flame zone thickness but also on conditional statistics, with the conditioning done on progress variable. It would be helpful to supplement these one-time scalar data with information on the transient behavior of flames as they undergo extinction and how the various commonly-used scalar measurements behave through a flame extinction event.…”

Section: Introductionmentioning

confidence: 99%

“…However, such simulations did not continue in time past the moment of CH* breakage and did not capture the full extinction process. Recently, in a high Reynolds number experiment of hydrocarbon-air premixed flames, the absence of CH* was correlated with local extinction [17], but it would be advantageous to know exactly when the chemiluminescence signal is lost during the extinction transient.…”

Section: Introductionmentioning

confidence: 99%

Assessment of experimental observables for local extinction through unsteady laminar flame calculations

Paxton

Giusti

Mastorakos

et al. 2019

Combustion and Flame

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Unsteady premixed and non-premixed counterflow laminar flame simulations were conducted in order to investigate extinction effects on observables commonly used in turbulent combustion. CH 4 and n-C 12 H 26 were the fuels studied, with air as the oxidizer at pressures of 1, 5, and 10 bar. It was determined that CH 2 O persists, compared to all other reactive species, during the extinction transient for both fuels and at all conditions, as the loss of OH concentration removes the dominant CH 2 O consumption pathway. The persistence of CH 2 O concentration is duplicated similarly in CH 4 and n-C 12 H 26 premixed flames. For non-premixed flames, the results indicate that the peak CH 2 O concentration reduction for n-C 12 H 26 flames is milder compared to CH 4 flames. Increasing the pressure causes an extension of reactivity, resulting in greater CH 2 O production and thus a delayed decay during the extinction transient. In addition, a change in the magnitude of the applied scalar dissipation rate for the non-premixed flames did not alter the trends of CH 2 O during extinction. Thus, caution is suggested when using CH 2 O in turbulent combustion experiments as a marker of the preheat zone thickness, given that increased levels of CH 2 O could be a result of multiple local extinction events. In addition, the product of OH and CH 2 O was found to scale well with the heat release rate for CH 4 and n-C 12 H 26 flames at multiple pressures. Finally, the CH* and OH* chemiluminescence was examined. CH* was found to extinguish slightly before the other species and more importantly, that once its concentration is reduced to a negligible level, the flame is on its way to extinction with no chance of recovery. OH* was determined to scale well with heat release at both 1 and 10 bar for both fuels and type of flames.

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Mid-infrared laser absorption tomography for quantitative 2D thermochemistry measurements in premixed jet flames

et al. 2018

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Comparative behavior of piloted turbulent premixed jet flames of C 1 C 8 hydrocarbons

Cited by 23 publications

References 36 publications

Lean Blow-Off Scaling of Turbulent Premixed Bluff-Body Flames of Vaporized Liquid Fuels

Lean Blow-Off Scaling of Turbulent Premixed Bluff-Body Flames of Vaporized Liquid Fuels

Assessment of experimental observables for local extinction through unsteady laminar flame calculations

Mid-infrared laser absorption tomography for quantitative 2D thermochemistry measurements in premixed jet flames

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