The role of low temperature fuel chemistry on turbulent flame propagation

Won, Sang Hee; Windom, Bret; Jiang, Bo; Ju, Yiguang

doi:10.1016/j.combustflame.2013.08.027

Cited by 77 publications

(38 citation statements)

References 33 publications

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“…Temperature measurements in a reactive flow were conducted in a multi-jet burner [23] with the equivalence ratio varying from 0.7 to 1.3 allowing for temperatures between 1500 and 2000 K to be measured. The temperature measurements were conducted along a line in the center of the burner 7 mm above the outlet of the burner as shown in Fig.…”

Section: Burner Measurementsmentioning

confidence: 99%

“…The energy splitting of indium makes it suitable as a temperature marker for flame temperatures above 1000 K [13]. There has, so far, been no investigations into temperature markers for temperatures below 1000 K, which is an important temperature range for low temperature chemistry [23]. Gallium has an energy splitting allowing for more sensitive measurements with better signal strengths at lower temperature ranges than indium and should be a suitable candidate as a temperature marker for these at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Diode laser-based thermometry using two-line atomic fluorescence of indium and gallium

et al. 2017

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the requirements listed above, is two-line atomic fluorescence (TLAF) [4][5][6]. TLAF is a laser-based ratiometric technique, in which the temperature-dependent population of two lower lying electronic states, of a seeded atom, is probed by laser excitation and the ratio of the resulting fluorescence is correlated with the temperature of the gas. TLAF offers several beneficial features for temperature measurements in reactive flows. Firstly, no a priori knowledge of the combustion environment is necessary as the technique is independent of quenching due to the excitation to a common upper state [7]. Secondly, the use of an atomic species as temperature marker offers advantages such as providing high transition probabilities yielding strong fluorescence signals as well as being free from errors related to vibrational and rotational energy transfer existing in molecules [8,9]. Thirdly, TLAF also has the possibility for thermometry measurements in sooting and particulate-laden flames as the detection wavelength can be shifted from the excitation wavelength [10,11]. The disadvantage of TLAF is that an atomic species, not normally present in the flame, has to be introduced which may add complexities to the experimental set-up.Two-line atomic fluorescence has been developed in steps where the first theoretical ground work was conducted by Alkemade [7] and experimentally demonstrated shortly thereafter using atomic lamps [12,13]. With the advent of suitable lasers, TLAF became a tool for temperature measurements with imaging capabilities in non-steady environments [4,10,11,[14][15][16]. Recently, TLAF measurement has been extended from the linear regime to non-linear regime by Medwell et al. [4] and to the saturation regime by Manteghi et al. [14] in an attempt to maximize the fluorescence signal for instantaneous temperature measurements. With the improvement in regards to available power and wavelengths of diode lasers, TLAF measurements using diode lasers have been shown to give accurate temperatures in both low-pressure and atmospheric Abstract A robust and relatively compact calibration-free thermometric technique using diode lasers two-line atomic fluorescence (TLAF) for reactive flows at atmospheric pressures is investigated. TLAF temperature measurements were conducted using indium and, for the first time, gallium atoms as temperature markers. The temperature was measured in a multi-jet burner running methane/air flames providing variable temperatures ranging from 1600 to 2000 K. Indium and gallium were found to provide a similar accuracy of ~ 2.7% and precision of ~ 1% over the measured temperature range. The reliability of the TLAF thermometry was further tested by performing simultaneous rotational CARS measurements in the same experiments.

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Section: Burner Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diode laser-based thermometry using two-line atomic fluorescence of indium and gallium

et al. 2017

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“…In contrast, previous numerical simulations at high Karlovitz numbers using detailed chemistry considered mostly simple fuels such as hydrogen [11][12][13]18], methane [14,15,18], and propane [14]. Recent experimental work [8,19] studied n-heptane/air combustion (and other heavy hydrocarbon fuels) in turbulent premixed flames. Since most transportation fuels are composed of large linear alkanes, cyclo-alkanes, iso-alkanes, and aromatic species, the study of all of these types of hydrocarbons is of interest.…”

Section: Introductionmentioning

confidence: 99%

Differential diffusion effects, distributed burning, and local extinctions in high Karlovitz premixed flames

Lapointe

Savard

Blanquart

2015

Combustion and Flame

110

108

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a b s t r a c tDirect numerical simulations of premixed n-heptane/air flames at different Karlovitz numbers are performed using detailed chemistry. Differential diffusion effects are systematically isolated by performing simulations with both non-unity and unity Lewis numbers. Different unburnt temperatures and turbulence intensities are used and their effects on the flame structure and chemical source terms are investigated. As the unburnt gases are preheated, the viscosity ratio across the flame is reduced and the Karlovitz number at the reaction zone is increased. The increase in turbulence intensity suppresses differential diffusion effects on the flame structure (i.e. species dependence on temperature). However, differential diffusion effects on the chemical source terms are still noticeable even at the highest Karlovitz number simulated. Simulations with differential diffusion effects exhibit lower mean fuel consumption and heat release rates than their unity Lewis number counterparts. However, the difference is reduced as the reaction zone Karlovitz number is increased. Transition to distributed burning is characterized by a broadening of the reaction zone resulting from enhanced turbulent mixing. Local extinctions in the burning rate are observed only in non-unity Lewis number simulations and their probability decreases at high Karlovitz numbers. These results highlight the importance of using the reaction zone Karlovitz number to investigate the effect of turbulence on the chemical source terms and to compare flames at different unburnt temperatures.

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“…The large hydrocarbon fuels used in diesel engines usually have strong low temperature behavior [12]. Oxidization of this type of fuels undergoes a complex chemical process, e.g., two-stage ignition.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of n-Dodecane spray combustion in a high pressure combustion vessel

2014

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The role of low temperature fuel chemistry on turbulent flame propagation

Cited by 77 publications

References 33 publications

Diode laser-based thermometry using two-line atomic fluorescence of indium and gallium

Diode laser-based thermometry using two-line atomic fluorescence of indium and gallium

Differential diffusion effects, distributed burning, and local extinctions in high Karlovitz premixed flames

Large eddy simulation of n-Dodecane spray combustion in a high pressure combustion vessel

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