Semi-Predictive Modeling of Diluted Ethanol and Methanol Combustion in Conventional Spark Ignition Operation
Technical Paper
2021-01-0386
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
Alcohols offer high resistance to autoignition which is necessary to attain the
required load in heavy duty (HD) spark ignition (SI) engines. Dilution increases
thermal efficiency and reduces propensity to autoignition making it an important
combustion strategy. Reliable and robust prediction at increased dilution is
necessary to support development of high efficiency spark ignition engines and
the transition to renewable fuels. A previous experimental study demonstrated 25
bar gross IMEPg for ethanol and methanol at λ=1.4 excess air ratio
and over 48% indicated efficiency at λ=1.6 on a single cylinder engine. Based on
this dataset, a semi-predictive model (SITurb) was fitted for a range of excess
air ratios and engine loads. With the default model, poor accuracy was observed
above λ=1.4. Ignition delay was incorrectly predicted at λ=1.6 and λ=1.8. To
improve the prediction at high dilution, an improved laminar flame speed
correlation was included which reduced the ignition delay error to within ±3 CAD
over the range of tested excess air ratios. To improve prediction of burn
duration at high dilution, the turbulent flame speed calibration constant was
made dependent on dilution level similar to previous research. With both
improvements, under ±5% error in IMEPg and under ±3 CAD error in burn
duration was achieved at all dilution levels. Finally, the Douaud and Eyzat
knock model was evaluated with respect to full load operation of ethanol and
methanol and its agreement to knock limited phasing discussed. Semi-predictive
models are simple to implement and will be instrumental in gas exchange modeling
and optimization of HD SI engines using future alcohol fuels. This study
provides the accuracy of standard models and improvements needed to predict
performance at diluted conditions.
Authors
Citation
Mahendar, S. and Erlandsson, A., "Semi-Predictive Modeling of Diluted Ethanol and Methanol Combustion in Conventional Spark Ignition Operation," SAE Technical Paper 2021-01-0386, 2021, https://doi.org/10.4271/2021-01-0386.Data Sets - Support Documents
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