Optimization of a natural gas SI engine employing EGR strategy using a two-zone combustion model

Ibrahim, Amr; Bari, Saiful

doi:10.1016/j.fuel.2007.10.004

Cited by 55 publications

(19 citation statements)

References 12 publications

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“…For the investigated cases, in order to see the influence of the heat transfer correlation choice, the Wiebe function parameters are taken the same for all examined correlations. Moreover, to use realistic parameters, physical considerations and several previous studies [1,3,8] for similar cases are used for their selection. Also, they are the suitable values for the majority of the correlations.…”

Section: C-heat Transfer Correlation Choice Optimizationmentioning

confidence: 99%

“…It has been recently used as an alternative to conventional fuels in order to satisfy some environmental and economical concerns. Moreover, governments have been motivated to expand in natural gas infrastructures in order to be feasible to passenger vehicles as well as stationary engines [1]. However, to be more attractive and feasible, many aspects have to be improved for best performance and emissions.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the previous studies, using two-zone model for natural gas SI engines, many choices are made for heat transfer evaluation. For instance, Ibrahim and co-workers [1,5] used Woschni correlation, Caillol and co-workers [6] used Hohenberg correlation and Soylu and co-workers [2,7], used Annand's. Also for heat exchange area estimation for the burned and unburned gases, several methods have been used.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on heat transfer evaluation for a more efficient two-zone combustion model in the case of natural gas SI engines

Lounici

Loubar

Balistrou

et al. 2011

Applied Thermal Engineering

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International audienceTwo-zone model is one of the most interesting engine simulation tools, especially for SI engines. However, the pertinence of the simulation depends on the accuracy of the heat transfer model. In fact, an important part of the fuel energy is transformed to heat loss from the chamber walls. Also, knock appearance is closely related to heat exchange. However, in the previous studies using two-zone models, many choices are made for heat transfer evaluation and no choice influence study has been carried out, in the literature. The current study aims to investigate the effect of the choice of both the heat transfer correlation and burned zone heat transfer area calculation method and provide an optimized choice for a more efficient two-zone thermodynamic model, in the case of natural gas SI engines. For this purpose, a computer simulation is developed. Experimental measurements are carried out for comparison and validation. The effect of correlation choice has been first studied. The most known correlations have been tested and compared. Our experimental pressure results, supported for more general and reliable conclusions, by a literature survey of many other studies, based on measured heat transfer rates for several SI engines, are used for correlation selection. It is found that Hohenberg's correlation is the best choice. However, the influence of the burned zone heat transfer area calculation method is negligible

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Section: C-heat Transfer Correlation Choice Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on heat transfer evaluation for a more efficient two-zone combustion model in the case of natural gas SI engines

Lounici

Loubar

Balistrou

et al. 2011

Applied Thermal Engineering

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“…Vehicle conversion to CNG is automatically EURO-1 compliant and has further possibilities to satisfy California's program for low emission vehicles (LEV), ultra-low emission vehicles (ULEV), and zero emission vehicles (ZEV). The use of CNG has shown reductions in emissions of carbon monoxide (CO) by 90-97%, carbon dioxide (CO 2 ) by 25%, nitrous oxide (NOx) by 35-60%, and non-methane hydrocarbon (NMHC) by 50-75%) [16]. In the context of developing countries in the Asia-Pacific region, Malaysia's role as an oil-producing country has been slowly reducing.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Compressed Natural Gas Burn Rate and Flame Propagation on a Sub-Compact Vehicle Engine

Ramasamy¹,

Kadirgama²,

Rahman³

et al. 2015

Int. J. Automot. Mech. Eng.

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In terms of sub-compact cars using alternative fuels, the vehicle characteristics are governed by the engine operation. The main focus of this paper was to evaluate a subcompact car engine on its performance and burn rate of gasoline and compressed natural gas (CNG) . A bi-fuel sequential system was used for this evaluation. Measurements of engine speed, torque and fuel were done on an eddy current dynamometer, while measurements of in-cylinder pressure, crank angle and spark were analyzed from results taken by a data acquisition system. The emissions readings were also compared using an emission analyzer. The results were analyzed for burn rate based on the first law of thermodynamics. A 3-dimensional computational fluid dynamics (CFD) model was done to estimate the flame speed. The comparison shows an average drop of 18.6% for the power, 7% for brake specific fuel consumption (BSFC) and the efficiency loss was 17.3%. Pressure analysis shows peak pressure dropped by 16%. The burn rate shows why CNG had a slower burning speed on the small engine. CFD predicted the flame propagation speed at 8.45 m/s. The engine speed of 4000 rpm at maximum brake torque produced the results nearest to those for gasoline. In conclusion, volumetric losses and CFD errors slightly reduce the accuracy of the results, but nevertheless an 8.45 m/s flame speed was estimated.

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“…SI engine NO emissions have been modelled previously by assuming that equilibrium is reached instantaneously behind the flame front for all species, with the exception of NO due to its slow rate of formation. Chemical kinetics are then used in the hot end gas to calculate NO production [6]. Improved predictions have been made by splitting the end gas into multiple zones that have burnt at different times, taking into account the difference in temperature of the charge that burns earlier and later in the engine cycle [4,7].…”

Section: Introductionmentioning

confidence: 99%

Modelling cycle to cycle variations in an SI engine with detailed chemical kinetics

Etheridge

Mosbach

Kraft

et al. 2011

Combustion and Flame

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Optimization of a natural gas SI engine employing EGR strategy using a two-zone combustion model

Cited by 55 publications

References 12 publications

Investigation on heat transfer evaluation for a more efficient two-zone combustion model in the case of natural gas SI engines

Investigation on heat transfer evaluation for a more efficient two-zone combustion model in the case of natural gas SI engines

Analysis of Compressed Natural Gas Burn Rate and Flame Propagation on a Sub-Compact Vehicle Engine

Modelling cycle to cycle variations in an SI engine with detailed chemical kinetics

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