Combustion and emission characteristics of DME as an alternative fuel for compression ignition engines with a high pressure injection system

Kim, Myung Yoon; Yoon, Seung Hyun; Ryu, Bong Woo; Lee, Chang Sik

doi:10.1016/j.fuel.2008.01.032

Cited by 127 publications

(95 citation statements)

References 15 publications

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“…Reduction of the discharge coefficient with increasing kinematic viscosity has also been observed in other studies for various nozzle geometries and fuels. [37][38][39] We consider now the absolute energy supplied to the fuel jet. Figure 5 shows as solid lines the total supplied energy to the liquid jet and demonstrates that it is a linear function of injection pressure.…”

Section: A Internal Developmentmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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The influence of liquid fuel properties on atomisation remains an open question. The droplet sizes in sprays from atomisers operated with different fuels may be modified despite the small changes of the liquid properties. This paper examines experimentally the development of a liquid jet injected from a plain orifice in order to evaluate changes in its behaviour due to modifications of the liquid properties, which may influence the final atomisation characteristics. Two aviation kerosenes with similar, but not identical physical properties are considered, namely standard JP8 kerosene as the reference fuel and bio-derived Hydro-processed Renewable Jet (HRJ) fuel as an alternative biofuel. The corresponding density, dynamic viscosity, kinematic viscosity and surface tension change by about +5%, -5%, -10% and +5% respectively, which are typical for ‘drop-in’ fuel substitution. Three aspects of the liquid jet behaviour are experimentally considered. The pressure losses of the liquid jet through the nozzle are examined in terms of the discharge coefficient for different flowrates. The morphology of the liquid jet is visualised using high magnification Laser Induced Fluorescence (LIF) imaging. Finally, the temporal development of the liquid jet interfacial velocity as a function of distance from the nozzle exit is measured from time-dependent motion analysis of dual-frame LIF imaging measurements of the jet. The results show that for the small changes in the physical properties between the considered liquid fuels, the direct substitution of fuel did not result in a drastic change of the external morphology of the fuel jets. However, the small changes in the physical properties modify the interfacial velocities of the liquid and consequently the internal jet velocity profile. These changes can modify the interaction of the liquid jet with the surroundings, including air flows in coaxial or cross flow atomisation, and influence the atomisation characteristics during changes of liquid fuels

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Section: A Internal Developmentmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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“…However, if combustion temperature is higher than the location of maximum net soot release, the soot formation decreases more slowly than soot oxidation. In comparison with conventional diesel fuel, DME contains the fuel-borne oxygen content in fuel, which can be about 35% by mass, may promote a more complete combustion and thus effectively reduce engine-out emissions of particulate matter (PM), carbon monoxide (CO), and unburned hydrocarbons (UHC) in modern CI engines [1,2]. However, it produces an increase in emissions of nitrogen oxides (NO x ), which can be partially caused by the fuel property, has been observed in the use of oxygenated fuels [9,12,13].…”

Section: Resultsmentioning

confidence: 99%

“…Due to the absence of direct carbon-carbon (C-C) bonding, DME can drastically reduce or suppress the formation and development of soot during combustion in a compression ignition engine. Due to these benefits in diesel engines, DME is the most promising alternative fuel for diesel engines [1,2]. As mentioned above, CI diesel engines have many advantages such as low fuel consumption, high thermal efficiency, and good output characteristics and durability compared to spark-ignited gasoline engines.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the NO x emissions in DME-fuelled diesel engines, EGR systems or various after-treatment devices have been applied. In the case of DME fuel, it contains about 34.8% of oxygen content in the fuel composition and has a higher cetane number than conventional diesel, as well as better fuel evaporation and atomization characteristics [2]. Therefore, DME combustion in a CI engine with higher EGR rate would be improved than the combustion of diesel fuel at same EGR rate.…”

Section: Introductionmentioning

confidence: 99%

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Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine

2013

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This study investigated the effects of high exhaust gas recirculation (EGR) rates on dimethyl ether (DME) fuel combustion performance, exhaust emissions and particle emission characteristics in a small direct injection diesel engine under various injection timings. To examine the effect of EGR and injection timings, the experiment was performed under high EGR rates (0%, 30%, 50%) and injection timings were varied from 40° before top dead center (BTDC) to top dead center (TDC) of the crank angle to examine the effects of early injection of DME fuel. The combustion pressures and heat release rates for different EGR rates followed similar trends. As the injection timing was advanced, the indicated mean effective pressure (IMEP) differed little in response to EGR rate in the range from TDC to 25° BTDC, and more for crank angles beyond 25° BTDC. DME combustion exhibited very little soot emission, but soot emission increased slightly with EGR rate. The use of high EGR during combustion produced very low NO x concentrations but increased HC and CO emissions for advanced injection timings from 25° BTDC to 40° BTDC. The use of EGR increased both the emissions of total particle number and particle volume over the whole range of the injection timings; for all cases, total particle volume decreased as injection timing was advanced. OPEN ACCESSEnergies 2013, 6 5158

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“…Hydrogen for fuel cell, bio-diesel fuel (BDF), dimethyl ether (DME) and ethanol as alternative energy source for vehicle has been widely studied (S. Verhelst&T. Wallner, 2009, M.Y. Kim et al, 2008, B. Kegl, 2011, T.M.I. Mahlia et al, 2012 and some of them have begun to exist at the market in the recent decade.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Studies on the Chemical Changes and Its Combustion Properties of Hydrocarbon Compounds by Ozone Injection

Yagyu¹,

Nagata²,

Hayashi³

et al. 2012

Internal Combustion Engines

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Combustion and emission characteristics of DME as an alternative fuel for compression ignition engines with a high pressure injection system

Cited by 127 publications

References 15 publications

How do liquid fuel physical properties affect liquid jet development in atomisers?

How do liquid fuel physical properties affect liquid jet development in atomisers?

Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine

Fundamental Studies on the Chemical Changes and Its Combustion Properties of Hydrocarbon Compounds by Ozone Injection

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