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Operating Characteristics of DME-Gasoline Dual-fuel in a Compression Ignition Engine at the Low Load Condition
Technical Paper
2013-01-0049
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Combustion and emission characteristics were investigated in a
compression ignition engine with dual-fuel strategy using dimethyl
ether (DME) and gasoline. Experiments were performed at the low
load condition corresponding to indicated mean effective pressure
of 0.45 MPa. DME was directly injected into the cylinder and
gasoline was injected into the intake manifold during the intake
stroke. The proportion of DME in the total input energy was
adjusted from 10% to 100%. DME DME injection timing was widely
varied to investigate the effect of injection timing on the
combustion phase. Injection pressure of DME was varied from 20 MPa
to 60 MPa. Exhaust gas recirculation (EGR) was controlled from 0%
to 60% to explore the effect of EGR on the combustion and emission
characteristics.
As DME proportion was decreased with the increased portion of
gasoline, the combustion efficiency was decreased but thermal
efficiency was increased. Injection timing was controlled to ensure
maximum thermal efficiency for all experimental conditions.
Unburned hydrocarbon resulted from over-lean mixture and crevice
region was increased. Combustion was dominated by the premixed
combustion when the gasoline portion increased so the combustion
duration was shortened. It affected the quasi-constant volume
combustion and the reduced heat transfer loss. Nitric oxides
(NOx) emissions were decreased with increased gasoline
proportion due to low combustion temperature from lean premixed
combustion even with decreased combustion duration. Soot emission
was nearly zero regardless of DME proportion and injection
timing.
When the DME injection pressure increased, NOx
emission was monotonically increased with improved thermal
efficiency. Ignition delay was significantly decreased since the
fuel atomization and mixing process were enhanced due to the high
spray momentum. Combustion duration was also shortened with intense
heat release.
With increased EGR rate, the thermal efficiency of dual-fuel
combustion was not decreased much but NOx emission was
significantly reduced. This was attributed to the increased heat
capacity of the in-cylinder charge resulting in decreased
combustion temperature.
High thermal efficiency and low NOx emissions were
realized with the optimized fuel proportion, injection timing,
injection pressure and EGR rate. Compared to only DME fuel concept
(single fuel concept), lower fuel consumption and improved emission
characteristics were achieved with optimized gasoline
proportion.
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Citation
Kim, K. and Bae, C., "Operating Characteristics of DME-Gasoline Dual-fuel in a Compression Ignition Engine at the Low Load Condition," SAE Technical Paper 2013-01-0049, 2013, https://doi.org/10.4271/2013-01-0049.Also In
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