A study on the combustion and emission characteristics of an SI engine under full load conditions with ethanol port injection and gasoline direct injection

Kim, Nam-Ho; Cho, Seokwon; Min, Kyoungdoug

doi:10.1016/j.fuel.2015.06.025

Cited by 70 publications

(16 citation statements)

References 25 publications

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“…Meanwhile, the increase of the compression ratio led to a higher engine efficiency. 26 Huang et al 27 investigated the effects of DI timing on mixture formation and combustion in an engine with DI of ethanol and PI of gasoline by numerical simulation. The results showed that the retardation of DI timing resulted in severe fuel impingement, partial over-cooling effect and over-rich mixture.…”

Section: Introductionmentioning

confidence: 99%

Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Feng

Jiang

et al. 2019

International Journal of Engine Research

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The combustion and emission characteristics of a dual-fuel spark-ignition engine with direct injection of gasoline surrogates and port injection of ethanol were studied. Toluene reference fuel with different research octane number namely TRF#1, TRF#2, TRF#3, TRF#4 and TRF#5 were employed as gasoline surrogates, in which TRF#1 with high octane number was to simulate commercial gasoline under direct-injection spark-ignition mode as comparison. For dual-fuel spark-ignition mode, the ethanol port-injection ratios were 21%, 25%, 29%, 32% and 35%, respectively. The results demonstrated that with the increase of the ethanol ratio, the knock-limited spark timing was advanced gradually. The emissions of hydrocarbon, ethane, propylene, isopentane, cyclohexane and aromatic hydrocarbons reduced while CO, NOx, ethylene, acetaldehyde and ethanol increased. Compared to TRF#1 in direct-injection spark-ignition mode, the indicated thermal efficiencies of dual-fuel spark-ignition mode were slightly lower under most test conditions. When direct injection of TRF#3, TRF#4, TRF#5 and the ethanol ratio was higher than 29%, some of the indicated thermal efficiencies of the engine were consistent with or higher than that of TRF#1 in direct-injection spark-ignition mode. Based on dual-fuel spark-ignition mode and with the assistance of port injection of ethanol, the indicated thermal efficiency of low research octane number fuels was comparable to that of TRF#1 in direct-injection spark-ignition mode.

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Section: Introductionmentioning

confidence: 99%

Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Feng

Jiang

et al. 2019

International Journal of Engine Research

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“…Low heat value (MJ/kg) [30] 43.5 26.9 Latent heat of vaporization (kJ/kg)(@25 • C) [31] 380-500 874 Reid vapor pressure (kPa)(@37.8 • C) [31] 72. 4 16.1 RON [26] 95.7 106 Theoretical air-fuel ratio [26] 14.8:1 9:1 Oxygen atom content (mass%) [32] ≤2 Table 4.…”

Section: Gasoline Ethanolmentioning

confidence: 99%

Comparative Study on the Effects of Ethanol Proportion on the Particle Numbers Emissions in a Combined Injection Engine

et al. 2019

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Ethanol has significant potential for the reduction of fuel consumption and the emissions of engines. In this paper, a dual-fuel combined engine test rig with ethanol injected in the intake port and gasoline injected directly into the cylinder are developed and the effects of ethanol/gasoline ratio (Re) on the combustion and emission of particle numbers are investigated experimentally. The results indicate that the peak in-cylinder temperature (Tmax) decreases continuously with the increase of the ethanol/gasoline ratio (Re). For particle emissions, ethanol can significantly reduce the accumulation mode particle number (APN) at low engine speed; and the lowest number of particulates are at G25 (the gasoline ratio is 25% of the fuel) at low load. And at high engine load, the total particle number (TPN) is insensitive to speed with large ethanol fraction and TPN is relatively small. With the decrease of Re (Re < 50%), TPN rises sharply. When the direct injection timing advances, TPN reduces continuously and the effects caused by speed can be neglected. On the contrary, the speed has significant effects on particle emissions at various ignition times. At low speed, increasing ignition advance can cause the increase of the TPN; which is contrary to the effects of particle emissions at medium engine speed. And the effect of ignition timing at high speed on particle number is not obvious. The ignition timing for which the lowest TPN is reached will increase with the direct injection timing advances.

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“…Studies have reported that more complete combustion caused by increased oxygen content with ethanol supplement reduces total hydrocarbons (THC) emission. 11 In addition, in studies where the compression ratio was increased by taking advantage of the high octane number of ethanol, it was observed that the increased cylinder temperatures decreased THC and CO. 2,16…”

Section: Introductionmentioning

confidence: 99%

“…1,15 Using this feature, which increases the knock resistance, in some studies where the ignition advance and compression ratio of the spark ignition (SI) engines are increased, significant improvements in performance values such as efficiency and power have been achieved. 16 Low carbon content of ethanol reduces CO emission. Moreover, one of the most dominant parameters affecting CO emissions is the air excess coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…8 Studies have reported that more complete combustion caused by increased oxygen content with ethanol supplement reduces total hydrocarbons (THC) emission. 11 In addition, in studies where the compression ratio was increased by taking advantage of the high octane number of ethanol, it was observed that the increased cylinder temperatures decreased THC and CO. 2,16 There is often a consensus in the literature that the ethanol addition reduces CO emissions with its low carbon content and more complete combustion due to its oxygen content. 3 However, some researchers have reported that decreasing in-cylinder temperature and incomplete combustion increases THC emissions due to its lower heating value and high heat of evaporation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of different levels of ethanol addition on performance, emission, and combustion characteristics of a gasoline engine

Köten

Karagöz

Balcı

2014

Advances in Mechanical Engineering

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In this study, a four-stroke, naturally aspirated, single-cylinder, spark ignition engine was operated with neat gasoline fuel. In-cylinder pressure, performance, and emission values were obtained at full load and 2400-r/min constant engine speed. Using these values, a single-dimensional theoretical model was calibrated. A Kistler spark plug–type pressure sensor was used to obtain in-cylinder pressure. After validation of this single-dimensional theoretical model obtained by the help of a commercial engine analysis software (AVL-Boost), different levels of ethanol addition (2.5%, 5%, 10%, 15%, and 20%) into gasoline were analyzed and compared with neat gasoline fueled conditions. According to obtained results, NO x emissions increased with incremental amount of ethanol. The CO and total hydrocarbons emissions decreased; however, they can be controlled using after-treatment systems such as three-way catalyst.

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A study on the combustion and emission characteristics of an SI engine under full load conditions with ethanol port injection and gasoline direct injection

Cited by 70 publications

References 25 publications

Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Comparative Study on the Effects of Ethanol Proportion on the Particle Numbers Emissions in a Combined Injection Engine

Effect of different levels of ethanol addition on performance, emission, and combustion characteristics of a gasoline engine

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