Influence of Engine Speed on Gasoline Compression Ignition (GCI) Combustion in a Single-Cylinder Light-Duty Diesel Engine

Dual-fuel reactivity-controlled compression ignition (RCCI) combustion using port injection of a less reactive fuel and early-cycle direct injection (DI) of a more reactive fuel has been shown to yield both high thermal efficiency and low NOX and soot emissions over a wide engine operating range. Conventional and alternative fuels such as gasoline, natural gas, and E85 as the lower reactivity fuel in RCCI have been studied by many researchers; however, published experimental investigations of hydrous ethanol use in RCCI are scarce. Making greater use of hydrous ethanol in internal combustion engines has the potential to dramatically improve the economics and life cycle carbon dioxide emissions of using bioethanol. In this work, an experimental investigation was conducted using 150 proof hydrous ethanol as the low reactivity fuel and commercially available diesel as the high reactivity fuel in an RCCI combustion mode at various load conditions. A modified single-cylinder diesel engine was used for the experiments. Based on previous studies on RCCI combustion by other researchers, early-cycle split-injection strategy of diesel fuel was used to create an in-cylinder fuel reactivity distribution to maintain high thermal efficiency and low NOX and soot emissions. At each load condition, timing and mass fraction of the first diesel injection was held constant, while timing of the second diesel injection was swept over a range where stable combustion could be maintained. Since hydrous ethanol is highly resistant to auto-ignition and has large heat of vaporization, intake air heating was needed to obtain stable operations of the engine. The study shows that 150 proof hydrous ethanol can be used as the low reactivity fuel in RCCI through 8.6 bar indicated mean effective pressure (IMEP) and with ethanol energy fraction up to 75% while achieving simultaneously low levels of NOX and soot emissions. With increasing engine load, less intake heating is needed and exhaust gas recirculation (EGR) is required to maintain low NOX emissions.

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Effect of Premixed Diesel Fuel on Partial HCCI Combustion Characteristics

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.663.26 ◽

2014 ◽

Vol 663 ◽

pp. 26-33

Author(s):

Y.H. Teoh ◽

H.H. Masjuki ◽

M.A. Kalam ◽

Muhammad Afifi Amalina ◽

H.G. How

Keyword(s):

Diesel Fuel ◽

Engine Speed ◽

Direct Injection ◽

Compression Ignition ◽

Cylinder Pressure ◽

Compression Ignition Engine ◽

Hcci Combustion ◽

Light Duty ◽

Auto Ignition ◽

Ignition Characteristics

This study investigated the effects of premixed diesel fuel on the auto-ignition characteristics in a light duty compression ignition engine. A partial homogeneous chargecompression ignition (HCCI) engine was modified from a single cylinder, four-stroke, direct injection compression ignition engine. The partial HCCI is achieved by injecting diesel fuel into the intake port of the engine, while maintaining diesel fuel injected in cylinder for combustion triggering. The auto-ignition of diesel fuel has been studied at various premixed ratios from 0 to 0.60, under engine speed of 1600 rpm and 20Nm load. The results for performance, emissions and combustion were compared with those achieved without premixed fuel. From the heat release rate (HRR) profile which was calculated from in-cylinder pressure, it is clearly observed that two-stage and three-stage ignition were occurred in some of the cases. Besides, the increases of premixed ratio to some extent have significantly reduced in NO emission.

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The Influence of Butanol Use on the Diesel Engine’s Performance

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.822.183 ◽

2016 ◽

Vol 822 ◽

pp. 183-189

Author(s):

Alexandru Dobre ◽

Constantin Pană ◽

Nikolaos Cristian Nuțu ◽

Niculae Negurescu ◽

Alexandru Cernat

Keyword(s):

Diesel Engine ◽

Numerical Modelling ◽

Diesel Fuel ◽

Engine Speed ◽

Butyl Alcohol ◽

Compression Ignition ◽

Primary Alcohols ◽

Maximum Torque ◽

Fuel Blends ◽

Compression Ignition Engines

Alcohols begin to show a real interest for their use as fuel at compression ignition engines due to require reducing the pollutants emissions, especially NOx emission. Among the primary alcohols, butyl alcohol (butanol) is considered to be of great perspective in its use as fuel in diesel engines due to its properties close to those of diesel fuel. It is miscible with the diesel fuel and the achieved blend is stable. In paper are presented some aspects regarding the diesel engine’s fuelling with butanol and diesel fuel blends using the experimental research and numerical modelling. The use of the butanol as a fuel for diesel engine has led to the reducing NOx emissions with about 25% and the Brake Specific Energetic Consumption (BSEC) with about 5% at the full load and the maximum torque engine speed.

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Investigation of Gasoline Compression Ignition (GCI) Combustion in a High Compression-Ratio Heavy-duty Single-Cylinder Diesel Engine

10.4271/2021-01-0495 ◽

2021 ◽

Author(s):

Khanh Cung ◽

Daniel Christopher Bitsis ◽

Jason Miwa ◽

Edward Smith ◽

Thomas Briggs ◽

...

Keyword(s):

Diesel Engine ◽

Compression Ratio ◽

Compression Ignition ◽

Heavy Duty ◽

High Compression Ratio ◽

Single Cylinder ◽

High Compression

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