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Uncertainty Assessment of Octane Index Framework for Stoichiometric Knock Limits of Co-Optima Gasoline Fuel Blends

Journal Article · · SAE International Journal of Fuels and Lubricants (Online)
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
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This study evaluates the applicability of the Octane Index (OI) framework under conventional spark ignition (SI) and “beyond Research Octane Number (RON)” conditions using nine fuels operated under stoichiometric, knock-limited conditions in a direct injection spark ignition (DISI) engine, supported by Monte Carlo-type simulations which interrogate the effects of measurement uncertainty. Of the nine tested fuels, three fuels are “Tier III” fuel blends, meaning that they are blends of molecules which have passed two levels of screening, and have been evaluated to be ready for tests in research engines. These molecules have been blended into a four-component gasoline surrogate at varying volume fractions in order to achieve a RON rating of 98. The molecules under consideration are isobutanol, 2-butanol, and diisobutylene (which is a mixture of two isomers of octene). Furthermore, the remaining six fuels were research-grade gasolines of varying formulations.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Program (EE-2G)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1497002
Alternate ID(s):
OSTI ID: 1513674
OSTI ID: 1639222
Report Number(s):
SAND--2019-1600J; 672555
Journal Information:
SAE International Journal of Fuels and Lubricants (Online), Journal Name: SAE International Journal of Fuels and Lubricants (Online) Journal Issue: 3 Vol. 11; ISSN 1946-3960
Publisher:
SAE InternationalCopyright Statement
Country of Publication:
United States
Language:
English

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