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2002-01-2702 |
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Title: Numerical evaluation of a
methanol-fueled directly injected engine |
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Abstract: |
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A numerical study on the combustion of methanol in a
directly injected (DI) engine was conducted. The study considers the
effect of the bowl-in-piston (BIP) geometry, swirl ratio (SR), and
relative equivalence ratio (λ), on flame propagation and burn rate of
methanol in a 4-stroke engine. Ignition-assist in this engine was
accomplished by a spark plug system. Numerical simulations of two different BIP geometries
were considered. Combustion characteristics of methanol under swirl and
no-swirl conditions were investigated. In addition, the amount of injected
fuel was varied in order to determine the effect of stoichiometry on
combustion. Only the compression and expansion strokes were simulated. The
results show that fuel-air mixing, combustion, and flame propagation was
significantly enhanced when swirl was turned on. This resulted in a higher
peak pressure in the cylinder, and more heat loss through the cylinder
walls. In addition, the results indicate that when a stoichiometric
mixture was used, incomplete combustion occurred. |
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Index Terms: |
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Alcohols;
Alternative
fuels; Combustion
processes; Direct
injection; Flame
propagation; Spark
ignition engines; |
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Author(s): |
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Other Info: |
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Publisher: Society of
Automotive Engineers, Inc., Warrendale, Pennsylvania, USA |
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Meeting Name: Powertrain
and Fluid Systems Conference and Exhibition |
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