Measurement of laminar burning velocity of ethanol-air mixtures at elevated temperatures

Katoch, Amit; Millán-Merino, Alejandro; Kumar, Sudarshan

doi:10.1016/j.fuel.2018.05.083

Cited by 47 publications

(18 citation statements)

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“…At each condition, the measurement is repeated three times, and an average value of laminar burning velocity is considered for uncertainty analysis. Using the above listed values, the maximum uncertainty was well within ±5% of the measured value and similar to the other measurements − reported using a quartz diverging channel.…”

Section: Experimental Analysissupporting

confidence: 87%

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

et al. 2020

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Experimental measurements of laminar burning velocity are presented for mixture temperatures above the autoignition temperature of premixed n-heptane + air mixtures using an externally heated mesoscale diverging channel method. Direct measurements of laminar burning velocity are carried out at 1 atm of pressure for an unburnt mixture temperature range (350−600 K) with the mixture equivalence ratio varying from ϕ = 0.6 to 1.5. Nonlinear power-law correlation is proposed to delineate the effect of change in the mixture temperature on the burning velocity variation at various equivalence ratios. A minimum value for the temperature exponent is observed for stoichiometric n-heptane + air mixtures. The maximum value of laminar burning velocity is measured for ϕ ≈ 1.1 at all mixture temperatures. The reported data sets are compared with the available experimental results and the predictions of various detailed kinetic models, i.e., LLNL V3.1 (2011), JetSurF 2.0 (2010), and Poli Mi (2014). Good agreement of the present data is observed with the predictions of the LLNL V3.1 reaction mechanism at all unburnt mixture temperatures. The predictions of other kinetic models show slight under-prediction at higher mixture temperatures. Sensitivity analysis using the LLNL V3.1 mechanism is reported to highlight the contribution of key reactions enhancing/reducing the laminar burning velocity at 470 and 600 K mixture temperatures. With an increase in the mixture temperature from 470 to 600 K, the influence of the chain branching reaction (H + O 2 ↔ O + OH) on laminar burning velocity increases nearly 63.5%. Formation of a vinyloxy radical (CH 2 CHO) from the oxidation of a vinyl radical (C 2 H 3 ) enhances the burning velocity at a 470 K temperature. Oxidation of C 2 H 3 (at 600 K) becomes crucial in governing engine knocking in low-temperature oxidation of n-heptane. It is deduced from the reaction pathway diagram that the production of a highly reactive compound, C 2 H 2 , at 600 K plays a significant role and governs the overall reaction rate of the mixture.

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Section: Experimental Analysissupporting

confidence: 87%

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

et al. 2020

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“…Externally heated meso-scale diverging channel method has been used in this work [41][42][43]. This technique has been used to measure the laminar burning velocities of various gaseous fuels [44][45][46][47] and liquid fuels [48][49][50][51] at high temperatures using planar stretch-free flames.…”

Section: Majority Of the Work On Development Of N-butanol Mechanisms mentioning

confidence: 99%

Experimental and numerical investigations on the laminar burning velocity of n-butanol + air mixtures at elevated temperatures

Katoch

Alfazazi

Sarathy

et al. 2019

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Laminar burning velocities of n-butanol+air mixtures were measured experimentally at elevated mixture temperatures using an externally heated meso-scale channel configuration.The measurements were carried out at atmospheric pressure for an equivalence ratio range 0.7-1.3 and unburnt mixture temperature range of 350 -600 K. Planar, stretch free and nearly adiabatic flames were stabilized in the diverging channel and used to extract the laminar burning velocity data based on mass conservation between the channel inlet and flame stabilization point. A skeletal kinetic-mechanism (124 species and 943 reactions) based on a previous model of Sarathy (2014) was developed to compare the present experimental results with mechanism predictions. Besides the skeletal model predictions, n-butanol experimental results were also compared with other recent kinetic models reported in literature. The effect of unburnt mixture temperature on burning velocity of n-butanol+air mixtures was evaluated using the power-law correlation : " = ",% " / ",%). The variation of temperature exponent (α) with equivalence ratio (Φ) was reported also for the first time. The values exhibit a non-linear inverted parabolic profile with a minimum value occurring for slightly rich mixtures at Φ =1.1.

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“…Li The present work has two key objectives: i) Addressing the scarcity of laminar burning velocity data for n-pentanol+air mixtures at high temperatures by providing new experimental measurements up to a mixture temperature of 560 K using meso-scale diverging channel technique. This method has been used previously for high temperature burning velocity measurements of various gaseous and liquid fuels [27][28][29][30][31][32][33]. ii) Develop a skeletal model for n-pentanol from Sarathy et al [21] high temperature alcohol model and compare its performance with existing models and current experimental data high mixture tempratures.…”

Section: Introductionmentioning

confidence: 99%

Measurement of laminar burning velocity of n-pentanol + air mixtures at elevated temperatures and a skeletal kinetic model

Katoch

Alfazazi

Sarathy

et al. 2019

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Long chain alcohols are potential fuels for engine applications, however, their combustion characteristics need to be adequately investigated compared to short chain alcohols (C 1-C 4), especially at high mixture temperatures, and other conditions relevant to engine temperatures. In the present work, meso-scale diverging channel method has been used to measure the laminar burning velocity of n-pentanol+air mixtures at elevated temperatures due to existence of very limited data at higher mixture temperatures (~ 473 K). The present experiments are carried out at atmospheric pressure with unburnt mixture temperature varying up to 560 K. The dependence of laminar burning velocity on temperature was correlated using the power law: , where α is the temperature exponent. The results show the existence of a minimum value of α for slightly rich mixtures. A reduced kinetic model based *Manuscript Click here to download Manuscript: Pentanol_final_rev3.docx Click here to view linked References on the previous detailed kinetic model of Sarathy (2014) for C 1-C 5 straight-chain alcohols was generated with 199 species and 1427 reactions. Experimental results of laminar burning velocity of n-pentanol+air mixtures at high temperatures were compared with the present model and other kinetic models from the literature. The skeletal model accurately reproduces the measurements at various conditions.

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Measurement of laminar burning velocity of ethanol-air mixtures at elevated temperatures

Cited by 47 publications

References 58 publications

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

Experimental and numerical investigations on the laminar burning velocity of n-butanol + air mixtures at elevated temperatures

Measurement of laminar burning velocity of n-pentanol + air mixtures at elevated temperatures and a skeletal kinetic model

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Measurement of laminar burning velocity of ethanol-air mixtures at elevated temperatures

Cited by 47 publications

References 58 publications

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

Experimental Investigations on Laminar Burning Velocities of n-Heptane + Air Mixtures at Higher Mixture Temperatures Using Externally Heated Diverging Channel Method

Experimental and numerical investigations on the laminar burning velocity of n-butanol + air mixtures at elevated temperatures

Measurement of laminar burning velocity of n-pentanol + air mixtures at elevated temperatures and a skeletal kinetic model

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Experimental and numerical investigations on the laminar burning velocity of n-butanol + air mixtures at elevated temperatures

Measurement of laminar burning velocity of n-pentanol + air mixtures at elevated temperatures and a skeletal kinetic model