Temperature measurements by oh lif and chemiluminescence kinetic modeling for ethanol flames

Marques, Carla S. T.; Santos, Leila Ribeiro dos; Sbampato, Maria Esther; Barreta, Luiz Gilberto; Santos, Alberto Monteiro dos

doi:10.1590/s0100-40422009000800017

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…Also, two recent detailed reaction mechanisms, , which exhibited excellent agreement with experimental data of ethanol combustion, ,, were applied for comparative analysis. Furthermore, two new updated and optimized reaction sets from previous studies , were also applied.…”

Section: Methodsmentioning

confidence: 99%

“…The new reaction mechanisms proposed here were developed by adding elementary reactions to a base reaction mechanism without considering NOx chemistry. , The base reaction mechanism is composed of 43 species and 179 reactions. Nine reactions were added to the base reaction set to build the 188-reactions mechanism and twenty-four reactions were added to the base mechanism to obtain the 205-reactions mechanism, including those nine initially added, as shown in Table .…”

Section: Methodsmentioning

confidence: 99%

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Reduced Reaction Mechanisms for Ethanol under Ultra-lean Conditions in Internal Combustion Engines

Marques

Silva²

2020

ACS Omega

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Chemical kinetics models for ethanol under ultra-lean engine conditions were evaluated to couple with CFD multidimensional simulations of a spark-assisted homogeneous charge compression ignition (HCCI) rotary engine. Five reduced reaction sets proper for CFD simulations and two detailed reaction mechanisms for comparison were tested by simulating ignition delay times, laminar flame speeds, and a single-cycle HCCI engine with virtual piston dimensions. The simulated results of the new mechanism with 188 reactions were well-fitted to both experimental ignition delay times for ultra-lean ethanol/air conditions and laminar flame speeds at high pressures. This reaction set resulted in better-simulated ignition delay times at 30 and 40 bar for ultra-lean ethanol/air conditions than other chemical kinetics models. Maximum temperatures and pressures of 2500–2580 K and 280–289 bar, respectively, were observed for hydrous ethanol/air under ultra-lean conditions in HCCI engine. In addition, the simulation results of the HCCI ethanol engine presented high pressure rise rates of 8–26 bar/CAD at 3600 rpm. These results indicated that the engine test should be carried out at 2500 rpm with 2 bar of boost pressure for CFD model calibration with the new optimized reaction mechanism.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Reduced Reaction Mechanisms for Ethanol under Ultra-lean Conditions in Internal Combustion Engines

Marques

Silva²

2020

ACS Omega

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Main sources of uncertainty in recent methanol/NOx combustion models

Kovács

Papp

Zsély

et al. 2021

Int J of Chemical Kinetics

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The performance of 17 recent detailed reaction mechanisms describing the interactions of methanol and formaldehyde with nitrogen oxides in combustion systems was investigated based on large number of literature experimental data covering a wide range of conditions. This data collection consists of 2552 data points of concentration profiles in 243 datasets measured in jet stirred reactors, tubular flow reactors, and shock tubes. The two best mechanisms were found to be the Shrestha-2019 and Glarborg-2018 mechanisms, which were selected for further investigations. Two additional mechanisms were created via the replacement of the hydrogen, syngas, methanol submechanisms, and the parameters of nine N/H/O reactions to ones from our previous mechanism optimization studies. Local sensitivity analysis of the kinetic and thermodynamic parameters (Arrhenius A-factors, heat capacities, standard enthalpies of formation, and standard molar entropies) of these four mechanisms was carried out. The results were in good agreement and the most sensitive reactions belong to the neat hydrogen, syngas, or methanol oxidation. The most important reactions of the interaction between C 1 species and NOx are hydrogen-abstraction reactions CH 3 OH + NO 2 = HONO + CH 2 OH and CH 2 O + NO 2 = HONO + HCO.The most sensitive thermodynamic properties are the molar heat capacities of species OH, NO, HONO, and NO 2 , and the standard enthalpies of formation and entropies of these species have also significant sensitivities. According to the local uncertainty analysis of the kinetic and thermodynamic parameters, the rate coefficients of the NOx chemistry have the highest contribution to the overall uncertainty of the simulation results, especially those of the two reactions above. The highest uncertainty caused by the thermodynamic parameters is due to the heat capacity of HNO, OH, HO 2 , and NO 2 and some other species, whereas the uncertainty contributions of all enthalpies of formation and entropies were negligible.

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Laser-saturated fluorescence of nitric oxide and chemiluminescence measurements in premixed ethanol flames

Marques¹,

Barreta²,

Sbampato³

et al. 2010

Experimental Thermal and Fluid Science

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Temperature measurements by oh lif and chemiluminescence kinetic modeling for ethanol flames

Cited by 7 publications

References 35 publications

Reduced Reaction Mechanisms for Ethanol under Ultra-lean Conditions in Internal Combustion Engines

Reduced Reaction Mechanisms for Ethanol under Ultra-lean Conditions in Internal Combustion Engines

Main sources of uncertainty in recent methanol/NOx combustion models

Laser-saturated fluorescence of nitric oxide and chemiluminescence measurements in premixed ethanol flames

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