Modeling Combustion in Compression Ignition Homogeneous Charge Engines

Kong, Song‐Charng; Ayoub, Nabil S.; Reitz, Rolf D.

doi:10.4271/920512

Cited by 68 publications

(32 citation statements)

References 15 publications

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“…This approach is conceptually consistent with the mixing combustion model of Magnussen et al [22]. The above combustion model has been found to give accurate results [21]. The CNlO fuel is considered the reference fuel that is representative of diesel fuels.…”

Section: Model Formulationsupporting

confidence: 60%

“…The turbulent timescale st is proportional to the eddy turnover time, Tt = c, k & (8) where C2=0.1 (Kong et al, [21]), and k and E are calculated from the modified RNG k-E turbulence model [17]. The delay coefficient (given byf= (I -6')/0.632, ) simulates the increasing influence of turbulence on combustion after ignition has occurred, and r is the ratio of the mass of products to that of total reactive species.…”

Section: Model Formulationmentioning

confidence: 99%

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Multidimensional Modeling of Fuel Composition Effects on Combustion and Cold-Starting in Diesel Engines

Ayoub¹,

Reitz²

1995

SAE Technical Paper Series

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Section: Model Formulationsupporting

confidence: 60%

Section: Model Formulationmentioning

confidence: 99%

Multidimensional Modeling of Fuel Composition Effects on Combustion and Cold-Starting in Diesel Engines

Ayoub¹,

Reitz²

1995

SAE Technical Paper Series

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“…For the rest of the required conditions, reliable estimations are used. The initial flow field is calculated by considering an initial swirl ratio at IVC equal to 1.5, since the inlet valve is unshrouded [33]. The initial turbulence properties are the same as the ones derived from a relevant work concerning the same engine [33], and are held constant for every case examined here, since the engine speed is kept constant as well.…”

Section: Computational Detailsmentioning

confidence: 99%

“…The initial flow field is calculated by considering an initial swirl ratio at IVC equal to 1.5, since the inlet valve is unshrouded [33]. The initial turbulence properties are the same as the ones derived from a relevant work concerning the same engine [33], and are held constant for every case examined here, since the engine speed is kept constant as well. More specifically, the initial turbulent velocity (u') at IVC is equal to 5.16 m/s, giving a rms turbulent velocity at TDC equal to around 0.86 m/s, although the latter value slightly changes with engine load and compression ratio.…”

Section: Computational Detailsmentioning

confidence: 99%

“…The methodology followed originates from the work of Abraham et al [30], which has gone through some major improvements ever since [31] and has been also extended to other types of engines [32,33]. Recently, it has been formulated for the simulation of hydrogen-fueled spark-ignition engines and validated against experimental data, while further details concerning the calculation of the reaction rates with the use of the characteristic conversion time-scale method can be found in Ref.…”

Section: Reaction Rate Calculationmentioning

confidence: 99%

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A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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A COMBINED EXPERIMENTAL AND NUMERICAL STUDY OF THERMAL PROCESSES, PERFORMANCE AND NITRIC OXIDE EMISSIONS IN A HYDROGEN-FUELED SPARK-IGNITION ENGINE ABSTRACTThis work concerns the study of a spark-ignition engine fueled with hydrogen, using both measured and numerical data at various conditions, focusing on the combustion efficiency, the heat transfer phenomena and heat loss to the cylinder walls, the performance, as well as the nitric oxide (NO) emissions formed, when the fuel/air and compression ratio are varied. For the investigation of the heat transfer mechanism, the local wall temperatures and heat flux rates were measured at three locations of the cylinder liner in a CFR engine. These fluxes can provide a reliable estimation of the total heat loss through the cylinder walls and of the hydrogen flame arrival at specific locations. Together with the experimental analysis, the numerical results obtained from a validated in-house CFD code were utilized for gaining a more complete view of the heat transfer mechanism and the hydrogen combustion efficiency for the various cases examined. The performance of the CFR engine is then identified, since the calculated cylinder pressures are compared with the measured ones, from which performance and heat release rates are calculated and discussed. Further, NO emission studies have been accomplished, with the calculated results not only being compared with the measured exhaust NO ones, but also further processed for conducting an in-depth investigation of the dependence of NO production on the spatial distribution of in-cylinder gas temperature. It is revealed that for lower fuel/air ratio the burned gas temperature is held at low level and the heat loss ratio is quite low. As the load increases and stoichiometric mixtures are used, the wall and in-cylinder gas temperatures increase substantially, together with the heat loss and the NO emissions, owing to the high hydrogen combustion velocity and the consequent high rate of temperature rise. The combustion efficiency is slightly increased, but the indicated efficiency is decreased due to higher heat loss.Keywords: hydrogen; spark-ignition engine; combustion efficiency; heat transfer; NO emissions.

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Integration of on‐the‐fly kinetic reduction with multidimensional CFD

Ierapetritou

Androulakis

2009

AIChE Journal

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A reduction approach for coupling complex kinetics with engine computational fluid dynamics (CFD) code has been developed. An on-the-fly reduction scheme was used to reduce the reaction mechanism dynamically during the reactive flow calculation in order to couple comprehensive chemistry with flow simulations in each computational cell. KIVA-3V code is used as the CFD framework and CHEMKIN is employed to formulate chemistry, hydrodynamics and transport. Mechanism reduction was achieved by applying element flux analysis on-the-fly in the context of the multidimensional CFD calculation. The results show that incorporating the on-the-fly reduction approach in CFD code enables the simulation of ignition and combustion process accurately compared with detailed simulations. Both species and time-dependant information can be provided by the current model with significantly reduced CPU time.

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Modeling Combustion in Compression Ignition Homogeneous Charge Engines

Cited by 68 publications

References 15 publications

Multidimensional Modeling of Fuel Composition Effects on Combustion and Cold-Starting in Diesel Engines

Multidimensional Modeling of Fuel Composition Effects on Combustion and Cold-Starting in Diesel Engines

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Integration of on‐the‐fly kinetic reduction with multidimensional CFD

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