Understanding how chemical structure affects ignition-delay-time <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:mi>ϕ</mml:mi></mml:math>-sensitivity

Messerly, Richard A.; Luecke, Jon; John, Peter C. St.; Etz, Brian D.; Kim, Yeonjoon; Zigler, Bradley T.; McCormick, Robert L.; Kim, Seonah

doi:10.1016/j.combustflame.2020.11.004

Cited by 6 publications

(1 citation statement)

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“…The next step with this work is to link the ϕ-sensitivity metrics measured in engines to the ϕ-sensitivity metrics measured in benchtop experiments , and kinetics simulations. , All three forms of ϕ-sensitivity evaluation are needed to fully validate simulations of the benefits that ACI engines and ϕ-sensitive fuels can confer. Kinetic mechanisms for the pentanols are currently under development at Lawrence Livermore National Laboratory …”

Section: Discussionmentioning

confidence: 99%

ϕ-Sensitivity of Gasoline/Oxygenate Blends in an Advanced Compression Ignition Engine

et al. 2023

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Advanced compression ignition (ACI) engines have shown the potential to improve internal combustion engine efficiency while drastically reducing levels of nitrogen oxides (NO X ) and particulate matter, including soot, in the exhaust. However, achieving high loads and control over ACI engines requires improvement of fuel ϕ-sensitivity relative to standard gasoline. Ideally, improving fuel ϕ-sensitivity will go hand-in-hand with reducing fuel carbon intensity. This study identifies three potential low-carbon fuels that can be blended with gasoline for use in ACI engines: methyl pentanoate, 1-pentanol, and 2-pentanol. These fuels have been tested in approximately 30% blends with gasoline at three different speed/load conditions in a medium-duty CI engine. Two different ϕ-sensitivity metrics were developed. The first metric ("Type 1") evaluates the change in ignition timing with respect to the start-of-injection timing of the final injection in a multi-pulse ACI injection schedule. According to this metric, 1-pentanol increased ϕ-sensitivity by 57%, 2-pentanol by 56%, and methyl pentanoate by 21% over the baseline gasoline. The second metric ("Type 2") determines how far combustion phasing, in terms of degrees of engine rotation, could be advanced before a limit of engine ringing intensity was reached. According to this metric, 1-pentanol allowed 1.03°of advance, 2-pentanol 0.83°, and methyl pentanoate only 0.20°. For both metrics, these results are the average of three speed/load engine conditions, and for the methyl pentanoate, the standard deviation across these three conditions was larger than the average ϕ-sensitivity improvement. This leads to the conclusion that methyl pentanoate does not offer any significant ϕ-sensitivity benefits, while the pentanols do. Both 1-pentanol and 2-pentanol are thus fuels of interest for further study as low-carbon blendstocks for ACI engines.

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