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Title: Co-Optima Core Fuels: Initial Investigations of Knocking Behavior in a DISI Engine.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1376811
Report Number(s):
SAND2016-8072PE
646736
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the AEC Program Review Meeting held August 16-19, 2016 in Southfield, MI.
Country of Publication:
United States
Language:
English

Citation Formats

Sjoberg, Carl Magnus Goran, and Vuilleumier, David. Co-Optima Core Fuels: Initial Investigations of Knocking Behavior in a DISI Engine.. United States: N. p., 2016. Web.
Sjoberg, Carl Magnus Goran, & Vuilleumier, David. Co-Optima Core Fuels: Initial Investigations of Knocking Behavior in a DISI Engine.. United States.
Sjoberg, Carl Magnus Goran, and Vuilleumier, David. 2016. "Co-Optima Core Fuels: Initial Investigations of Knocking Behavior in a DISI Engine.". United States. doi:. https://www.osti.gov/servlets/purl/1376811.
@article{osti_1376811,
title = {Co-Optima Core Fuels: Initial Investigations of Knocking Behavior in a DISI Engine.},
author = {Sjoberg, Carl Magnus Goran and Vuilleumier, David},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
Other availability
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  • Abstract not provided.
  • There are strong demands today to improve the thermal efficiency of internal combustion engines in order to promote energy conservation and the resolution of environmental issues. A major factor impeding further improvement of the thermal efficiency of spark-ignition engines is knocking. If knocking could be suppressed, it would allow the use of a higher compression ratio for improved thermal efficiency, and thereby reduce fuel consumption. As a result, atmospheric emissions of CO{sub 2} would also be reduced. The behavior of the end gas in an actual engine during the process from the onset of preflame reactions to the occurrence ofmore » knocking, including the chemical reactions involved, is still not clearly understood. This study focused on light emission behavior at wavelengths corresponding to the spectra of the formaldehyde, (HCHO, characteristic spectrum of 395.2 nm), HCO (329.8 nm) and OH (306.4 nm) radicals. Investigations were made of the role of low-temperature flames in the preflame reaction region of a spark-ignition engine under the occurrence of autoignition leading to knocking. The measurements obtained for HCHO when the blended fuel (20 RON) was used as the test fuel showed an increase in emission intensity in the early period of the preflame reactions under normal combustion, followed by a decline in intensity. Under a condition of severe knock induced by an overheated cylinder head, it was observed that the maximum emission intensity decreased. These tendencies are thought to correspond to the passage and degeneracy of a cool flame. When isooctane (100 RON) was used as the test fuel, the measurements obtained for HCHO showed an increase in emission intensity in the preflame reaction period, behavior thought to indicate the passage of a cool flame, but the characteristics associated with the degeneracy of a cool flame were not observed.« less
  • This presentation reports recent progress on light-duty boosted spark-ignition fuels/engines being developed under the Co-Optimization of Fuels and Engines initiative (Co-Optima). Co-Optima is focused on identifying fuel properties that optimize engine performance, independent of composition, allowing the market to define the best means to blend and provide these fuels. However, in support of this, we are pursuing a systematic study of blendstocks to identify a broad range of feasible options, with the objective of identifying blendstocks that can provide target ranges of key fuel properties, identifying trade-offs on consistent and comprehensive basis, and sharing information with stakeholders.