Simulation of High Efficiency Heavy Duty SI Engines Using Direct Injection of Alcohol for Knock Avoidance

Blumberg, Paul N.; Bromberg, L.; Kang, Hyungsuk; Tai, Chun

doi:10.4271/2008-01-2447

Cited by 27 publications

(4 citation statements)

References 12 publications

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“…Knock is fundamentally a chemical process initiated by preflame reactions leading to autoignition. The preflame reactions are a strong function of temperature, so evaporative cooling from the fuel can also play a significant role, which is particularly important for fuels containing alcohol. − …”

Section: Introductionmentioning

confidence: 99%

The Effect of Compression Ratio, Fuel Octane Rating, and Ethanol Content on Spark-Ignition Engine Efficiency

Leone

Anderson

Davis

et al. 2015

Environ. Sci. Technol.

127

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Light-duty vehicles (LDVs) in the United States and elsewhere are required to meet increasingly challenging regulations on fuel economy and greenhouse gas (GHG) emissions as well as criteria pollutant emissions. New vehicle trends to improve efficiency include higher compression ratio, downsizing, turbocharging, downspeeding, and hybridization, each involving greater operation of spark-ignited (SI) engines under higher-load, knock-limited conditions. Higher octane ratings for regular-grade gasoline (with greater knock resistance) are an enabler for these technologies. This literature review discusses both fuel and engine factors affecting knock resistance and their contribution to higher engine efficiency and lower tailpipe CO2 emissions. Increasing compression ratios for future SI engines would be the primary response to a significant increase in fuel octane ratings. Existing LDVs would see more advanced spark timing and more efficient combustion phasing. Higher ethanol content is one available option for increasing the octane ratings of gasoline and would provide additional engine efficiency benefits for part and full load operation. An empirical calculation method is provided that allows estimation of expected vehicle efficiency, volumetric fuel economy, and CO2 emission benefits for future LDVs through higher compression ratios for different assumptions on fuel properties and engine types. Accurate "tank-to-wheel" estimates of this type are necessary for "well-to-wheel" analyses of increased gasoline octane ratings in the context of light duty vehicle transportation.

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Section: Introductionmentioning

confidence: 99%

The Effect of Compression Ratio, Fuel Octane Rating, and Ethanol Content on Spark-Ignition Engine Efficiency

Leone

Anderson

Davis

et al. 2015

Environ. Sci. Technol.

127

View full text Add to dashboard Cite

show abstract

“…Combustion duration: Reducing the combustion time has an obvious impact on the knock control and can be approached by either increasing the combustion speed through a higher turbulence intensity, or reducing the flam propagation distance by means of an optimal design of the combustion chamber geometry and an optimal location of the spark plug [23]. Injection strategy: The use of direct injection of a second fuel, in particular, alcohol such as ethanol or methanol is an effective approach for knock control in SI engine [24].…”

Section: Introductionmentioning

confidence: 99%

The effects of research octane number and fuel systems on the performance and emissions of a spark ignition engine: A study on Saudi Arabian RON91 and RON95 with port injection and direct injection systems

Binjuwair

Mohamad

Almaleki

et al. 2015

Fuel

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“…Generally, alcohols in CI engines reduce CO 2 and PM emissions with some changes in their cetane index and combustion process. Alcohol-based fuels can easily be used as blends in a diesel without any major changes and modifications to the engine [64].…”

Section: Properties Of Bioalcoholsmentioning

confidence: 99%

Promising Bioalcohols for Low-Emission Vehicles

Tanwar¹,

Torres

Al-Qahtani

et al. 2023

Energies

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In recent decades, many kinds of research have been conducted on alternative fuels for compression ignition (CI) engines. Low/zero-carbon fuels, such as bioalcohols and hydrogen, are the most promising alternative fuels and are extensively studied because of their availability, ease of manufacturing, and environmental benefits. Using these promising fuels in CI engines is environmentally and economically beneficial. The most common alcohols are methanol, ethanol, isopropanol, propanol, butanol, n-butanol, tert-butanol, iso-butanol, and pentanol. The primary objective of this review paper is to examine the impact of bioalcohols and their blends with conventional diesel fuel in CI engines since these fuels possess characteristic properties that impact overall engine performance and exhaust emissions. This research also indicated that alcohols and blended fuels could be used as fuels in compression ignition engines. Chemical and physical properties of alcohols were examined, such as lubricity, viscosity, calorific value, and cetane number, and their combustion characteristics in compression ignition engines provide a comprehensive review of their potential biofuels as alternative fuels.

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Simulation of High Efficiency Heavy Duty SI Engines Using Direct Injection of Alcohol for Knock Avoidance

Cited by 27 publications

References 12 publications

The Effect of Compression Ratio, Fuel Octane Rating, and Ethanol Content on Spark-Ignition Engine Efficiency

The Effect of Compression Ratio, Fuel Octane Rating, and Ethanol Content on Spark-Ignition Engine Efficiency

The effects of research octane number and fuel systems on the performance and emissions of a spark ignition engine: A study on Saudi Arabian RON91 and RON95 with port injection and direct injection systems

Promising Bioalcohols for Low-Emission Vehicles

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