A Reduced Reaction Mechanism for Predicting Knock in Dual-Fuel Engines

Li, S. C.; Williams, Forman A.; Gebert, K.

doi:10.4271/2000-01-0957

Cited by 20 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laminar flame speed simulations have been performed using the one-dimensional premixed laminar flame propagating module incorporated in DARS [35]. According to previous studies, thermal diffusion and radiation factors have a significant effect on the accuracy of the simulations [22]. Keromnes et al [27] showed that, for stoichiometric mixtures, the calculated laminar flame speed increased by 8% if the thermal diffusion and radiation factors are excluded from the simulations.…”

Section: Laminar Flame Speedmentioning

confidence: 99%

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

2019

View full text Add to dashboard Cite

This study investigated the effects of H2 and CH4 concentrations on the ignition delay time and laminar flame speed during the combustion of CH4/H2 and multicomponent syngas mixtures using a novel constructed reduced syngas chemical kinetics mechanism. The results were compared with experiments and GRI Mech 3.0 mechanism. It was found that mixture reactivity decreases and increases when higher concentrations of CH4 and H2 were used, respectively. With higher H2 concentration in the mixture, the formation of OH is faster, leading to higher laminar flame speed and shorter ignition delay time. CH4 and H2 concentrations were calculated at different pressures and equivalence ratios, showing that at high pressures CH4 is consumed slower, and, at different equivalence ratios CH4 reacts at different temperatures. In the presence of H2, CH4 was consumed faster. In the conducted two-stage sensitivity analysis, the first analysis showed that H2/CH4/CO mixture combustion is driven by H2-based reactions related to the consumption/formation of OH and CH4 recombination reactions are responsible for CH4 oxidation. The second analysis showed that similar CH4-based and H2 -based reactions were sensitive in both, methane- and hydrogen-rich H2/CH4 mixtures. The difference was observed for reactions CH2O + OH = HCO + H2O and CH4 + HO2 = CH3 + H2O2, which were found to be important for CH4-rich mixtures, while reactions OH + HO2 = H2O + O2 and HO2 + H = OH + OH were found to be important for H2-rich mixtures.

show abstract

Section: Laminar Flame Speedmentioning

confidence: 99%

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

2019

View full text Add to dashboard Cite

show abstract

“…To consider CH 4 component in the syngas composition, the nine-step reduced mechanism for CH 4 autoignition by Li et al [46] [48]. This implies that C 7 H 16 is only used to initiate the pilot ignition of syngas.…”

Section: Development Of the Syngas Kinetics Mechanismmentioning

confidence: 99%

“…This reaction is the most sensitive of the CO subsystems under the conditions investigated. The rate constant used for this reaction was updated taking the rate constant from Li and Williams [46] that was originally proposed by Lindstedt and Skevis [90].…”

Section: (R2) Ch 4 + O 2 = Ch 3 + Homentioning

confidence: 99%

Chemical kinetics and CFD analysis of supercharged micro-pilot ignited dual-fuel engine combustion of syngas

Stylianidis

Azimov

Maheri

et al. 2017

Fuel

View full text Add to dashboard Cite

A comprehensive chemical kinetics and computational fluid-dynamics (CFD) analysis were performed to evaluate the combustion of syngas derived from biomass and coke-oven solid feedstock in a micro-pilot ignited supercharged dual-fuel engine under lean conditions. The developed syngas chemical kinetics mechanism was validated by comparing ignition delay, in-cylinder pressure, temperature and laminar flame speed predictions against corresponding experimental and simulated data obtained by using the most commonly used chemical kinetics mechanisms developed by other authors. Sensitivity analysis showed that reactivity of syngas mixtures was found to be governed by H 2 and CO chemistry for hydrogen concentrations lower than 50% and mostly by H 2 chemistry for hydrogen concentrations higher than 50%. In the mechanism validation, particular emphasis is placed on predicting the combustion under high pressure conditions. For high hydrogen concentration in syngas under high pressure, the reactions HO 2 +HO 2 =H 2 O 2 +O 2 and H 2 O 2 +H=H 2 +HO 2 were found to play important role in in-cylinder combustion and heat production. The rate constants for H 2 O 2 +H=H 2 +HO 2 reaction showed strong sensitivity to high-pressure ignition times and has considerable uncertainty. Developed mechanism was used in CFD analysis to predict in-cylinder combustion of syngas and results were compared with experimental data. Crank angle-resolved spatial distribution of in-cylinder spray and combustion temperature was obtained. The constructed mechanism showed the closest prediction of combustion for both biomass and coke-oven syngas in a micro-pilot ignited supercharged dual-fuel engine.

show abstract

“…The use of kinetics-controlled reaction rates usually results in very fast combustion rates (Kong et al, 1992;Liu, 1995;Li and Williams, 2000;Kusaka et al, 2000Kusaka et al, , 2002Khalil and Karim, 2002). The fuel, oxidiser and intermediate products may not have enough time then to mix down to the molecular level in the actual engines.…”

Section: Model Formulation and Energy Analysismentioning

confidence: 99%

Exergy analysis of combustion characteristics and NO<SUB align="right">x emissions of a dual-fuel engine

Morsy

El–Leathy

Hepbaşlı

2012

IJEX

View full text Add to dashboard Cite

The combustion characteristics and NO x emissions of compression ignition engines working on a dual fuel mode are investigated numerically and their exergetic efficiencies are determined. The model has been validated with available experimental results. The simulation results show that dual fuel engine combustion and trend of NO x emissions are well predicted by the present model. Parametric study showed improvements in engine performance and an increase in NO x emissions with decreased advanced injection timing of the pilot fuel as well as with increased intake temperature and pilot fuel quantity. The maximum values for energy and exergy are found to be comparable.Arif Hepbasli has an industrial experience of ten years obtained from various Turkish energy companies. Some of his research covers energy, exergy, exergoeconomic and exergoenvironmental analyses and assessments of thermal systems, energy/exergy efficiency and management, ground-source heat pumps and sustainable energy technologies. He is a Certified Industrial Energy Manager, and has authored and co-authored more than 480 conference and journal papers. He has chaired/co-chaired many national and international conferences, symposia, workshops and technical meetings. He has served as a consultant in cases involving his research area and is also a member of the editorial board in various prestigious international journals.

show abstract

A Reduced Reaction Mechanism for Predicting Knock in Dual-Fuel Engines

Cited by 20 publications

References 5 publications

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

Chemical kinetics and CFD analysis of supercharged micro-pilot ignited dual-fuel engine combustion of syngas

Exergy analysis of combustion characteristics and NO<SUB align="right">x emissions of a dual-fuel engine

Contact Info

Product

Resources

About