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Analysis of the Effects of Certain Alcohol and Furan-Based Biofuels on Controlled Auto Ignition
Technical Paper
2012-01-1135
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For gasoline engines controlled autoignition provides the vision
of enabling the fuel consumption benefit of stratified lean
combustion systems without the drawback of additional NOx
aftertreatment.
In this study the potential of certain biofuels on this
combustion system was assessed by single-cylinder engine
investigations using the exhaust strategy "combustion chamber
recirculation" (CCR). For the engine testing sweeps in the
internal EGR rate with different injection strategies as well as
load sweeps were performed. Of particular interest was to reveal
fuel differences in the achievable maximal load as well as in the
NOx emission behavior. Additionally, experiments with a shock
tube and a rapid compression machine were conducted in order to
determine the ignition delay times of the tested biofuels
concerning controlled autoignition-relevant conditions. The tested
biofuels included the pure alcohols 1-Butanol and 2-Butanol as well
as the furans Tetrahydro-2-Methylfuran (2-MTHF) and 2-Methylfuran.
Conventional RON 95 pump fuel and Ethanol served as
state-of-the-art non-bio and bio references.
The engine tests revealed Ethanol and 2-Butanol as the biofuels
which needed the highest rate of trapped internal residuals and are
least prone of autoignition. 1-Butanol, RON 95 pump fuel as well as
2-Methylfuran show similar autoignition behavior. 2-MTHF can be
auto ignited with the lowest amount of internal EGR. It could be
shown that for comparable center of combustion the fuel individual
necessary internal EGR amount correlates almost linearly with its
octane number, especially MON. Also the ignition delay measurements
are mostly in line with the engine results. All investigated
alcohol fuels reveal comparably low NOx emissions due to their
high enthalpy of vaporization and particularly lower adiabatic
flame temperatures. E.g., Ethanol shows in contrast to the
conventional RON 95 pump fuel up to 76% less NOx emissions at
comparable center of combustion. At sufficiently lean conditions
the highest engine loads with controlled autoignition combustion
are obtained with the high-knock-resistant fuels Ethanol and
2-Butanol. For both fuels the maximum engine load can be enhanced
by approximately 10% compared to the RON 95 pump fuel at an engine
speed of n = 1500 min-₁, whereas 2-MTHF revealed an approximately
8% lower feasible maximal load.
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Authors
- Adrien Brassat - Institute for Combustion Engines, RWTH Aachen University
- Matthias Thewes - Institute for Combustion Engines, RWTH Aachen University
- Martin Müther - Institute for Combustion Engines, RWTH Aachen University
- Stefan Pischinger - Institute for Combustion Engines, RWTH Aachen University
- Changyoul Lee - PCFC, RWTH Aachen University
- Ravi Xavier Fernandes - PCFC, RWTH Aachen University
- Herbert Olivier - Shock Wave Laboratory, RWTH Aachen University
- Yasar Uygun - Shock Wave Laboratory, RWTH Aachen University
Topic
Citation
Brassat, A., Thewes, M., Müther, M., Pischinger, S. et al., "Analysis of the Effects of Certain Alcohol and Furan-Based Biofuels on Controlled Auto Ignition," SAE Technical Paper 2012-01-1135, 2012, https://doi.org/10.4271/2012-01-1135.Data Sets - Support Documents
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