Alternative fuel and gasoline in an SI engine: A comparative study of performance and emissions characteristics

Pourkhesalian, Ali Mohammad; Shamekhi, Amir H.; Salimi, Farhad

doi:10.1016/j.fuel.2009.11.025

Cited by 217 publications

(90 citation statements)

References 13 publications

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“…Also, the employed laminar burning velocity correlation resulted in poor results for rich mixtures. Pourkhesalian et al [15] came to the same conclusions using a similar model for engines running on neat methanol and 80 ethanol.…”

Section: Quasi-dimensional Engine Modelingmentioning

confidence: 62%

“…The power cycle predictions for varying mixture composition are significantly improved by the introduction of new laminar burning velocity correlations. A comparison of turbulent combustion 15 models indicates that models including thermodiffusive properties perform slightly better than simpler formulations. Finally, a preliminary evaluation of a new knock prediction model for methanol engines confirms useful results can be obtained for quantities relevant to knock.…”

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confidence: 99%

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Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

2014

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Methanol and ethanol are promising alternative SI engine fuels. Engine simulation tools could help to unlock the full potential of these fuels. Previous work by the current authors has focused on building submodels to predict the gas dynamics, combustion and knock occurrence in alcohol engines. Here, 10 these building blocks are implemented in a quasi-dimensional engine simulation code, which is subsequently validated against measurements on two engines for various working conditions. The power cycle predictions for varying mixture composition are significantly improved by the introduction of new laminar burning velocity correlations. A comparison of turbulent combustion 15 models indicates that models including thermodiffusive properties perform slightly better than simpler formulations. Finally, a preliminary evaluation of a new knock prediction model for methanol engines confirms useful results can be obtained for quantities relevant to knock. The largest inaccuracies occur for varying equivalence ratios. Including the effects of methanol on 20 evaporation cooling and wall heat transfer might resolve this. The higher heat of vaporization relative to gasoline also required the inclusion of fuel puddling dynamics for a correct prediction of the volumetric efficiency by the breathing cycle model.

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Section: Quasi-dimensional Engine Modelingmentioning

confidence: 62%

mentioning

confidence: 99%

Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

2014

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“…한편 CNG의 고옥탄가는 엔진이 고압축비 조건 하에서 작동하도록 하여 고효율에 이르도록 한다 (17)(18) . 현재까 지 직분식 천연가스 엔진에 대한 연구는 천연가스 균질 급기 스파크점화 엔진과 직분식 스파크점화 CNG 엔진 의 측면에서 진행된 연구 등이 있다 (19)(20) .…”

Section: 서 론 자동차 배기가스 배출로 인한 환경문제가 심각해질수unclassified

An Experimental Study on the Ignition Probability and Combustion Flame Characteristics of Spark-Ignited Direct-Injection CNG

Hwang¹,

Chung²,

Yeom³

et al. 2016

Journal of ILASS-Korea

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For the SI engines, at only full load, the pumping loss has a negligible effect, while at part load conditions, the pumping loss increases. To avoid the pumping loss, the spark-ignited engines are designed to inject gasoline directly into the combustion chamber. In the spark-ignited direct-injection engines, ignition probability is important for successful combustion and the flame propagation characteristics are also different from that of pre-mixed combustion. In this paper, a visualization experiment system is designed to study the ignition probability and combustion flame characteristics of spark-ignited directinjection CNG fuel. The visualization system is composed of a combustion chamber, fuel supply system, air supply system, electronic control system and data acquisition system. It is found that ambient pressure, ambient temperature and ambient air flow velocity are important parameters which affect the ignition probability of CNG-air mixture and flame propagation characteristics and the injected CNG fuel can be ignited directly by a spark-plug under proper ambient conditions. For all cases of successful ignition, the flame propagation images were digitally recorded with an intensified CCD camera and the flame propagation characteristics were analyzed.

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“…Published simulation work on methanol and ethanol fuelled engines often resorts to outdated laminar burning velocity correlations by Gibbs & Calcote [24] (used in [25]), Metghalchi & Keck [26] (used in [25], [27] and [8]) and Gülder [28] (used in [29] and [30]). Some authors [27] prefer the more recent correlation of Liao et al [31], which basically has the same form:…”

Section: Simulation Programmentioning

confidence: 99%

Development and Validation of a Quasi-Dimensional Model for (M)Ethanol-Fuelled SI Engines

Vancoillie

Sileghem

Demuynck

et al. 2012

Lecture Notes in Electrical Engineering

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-Methanol and ethanol are interesting spark-ignition engine fuels, both from a production and an end-use point of view. Despite promising experimental results, the full potential of these fuels remain to be explored. In this respect, quasi-dimensional engine simulation codes are especially useful as they allow cheap and fast optimization of engines. The aim of the current work was to develop and validate such a model for methanol-fuelled engines. Several laminar burning velocity correlations and turbulent burning velocity models were implemented in a QD code and their predictive performance was assessed for a wide range of engine operating conditions.The effects of compression ratio and ignition timing on the in-cylinder combustion were well reproduced irrespective of the employed correlation or model. However, to predict the effect of changes in mixture composition, the correlation and model selection proved crucial. Compared to existing correlations, a new correlation developed by the current authors led to better reproduction of the effects of equivalence ratio and residual gas content and the combustion duration.For the turbulent burning velocity, the models of Damköhler and Peters consistently underestimated the influence of equivalence ratio and residual gas content on the combustion duration, while the Gülder, Leeds, Zimont and Fractals model corresponded well with the experiments. The combination of one of these models with the new correlation can be used with confidence to simulate the performance and efficiency of methanol-fuelled engines.INTRODUCTION -The use of sustainable liquid alcohols in spark-ignition engines offers the potential of decarbonizing transport and securing domestic energy supply while increasing engine performance and efficiency compared to fossil fuels thanks to a number of interesting properties [1,2]. The most significant interesting properties of light alcohols include:-High heat of vaporization, which causes considerable charge cooling as the injected fuel evaporates -Elevated knock resistance, which allows to apply higher compression ratios (CR), optimal spark timing and aggressive downsizing. -High flame speeds, enabling qualitative load control using mixture richness or varying amounts of exhaust gas recirculation (EGR). The potential of neat light alcohol fuels (methanol and ethanol) has been demonstrated experimentally in both dedicated and flex-fuel alcohol engines [1]. In dedicated alcohol engines high compression ratios enable peak brake thermal efficiencies up to 42%, while throttleless load control using EGR allows to spread the high efficiencies to the part load regions [1,3]. In flex-fuel engines the CR is limited due to knock constraints associated with gasoline operation, but still relative power and efficiency benefits of about 10% and NO x reductions of 5-10 g/kWh can be obtained over the entire load range thanks to more isochoric combustion, optimal ignition timing and reduced flow and dissociation losses [1].

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Alternative fuel and gasoline in an SI engine: A comparative study of performance and emissions characteristics

Cited by 217 publications

References 13 publications

Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

An Experimental Study on the Ignition Probability and Combustion Flame Characteristics of Spark-Ignited Direct-Injection CNG

Development and Validation of a Quasi-Dimensional Model for (M)Ethanol-Fuelled SI Engines

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