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Title: Effects of gasoline reactivity and ethanol content on boosted premixed and partially stratified low-temperature gasoline combustion (LTGC)

Journal Article · · SAE International Journal of Engines (Online)
DOI:https://doi.org/10.4271/2015-01-0813· OSTI ID:1237376
 [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Melbourne, Victoria (Australia)
+ Show Author Affiliations

Low-temperature gasoline combustion (LTGC), based on the compression ignition of a premixed or partially premixed dilute charge, can provide thermal efficiencies (TE) and maximum loads comparable to those of turbo-charged diesel engines, and ultra-low NOx and particulate emissions. Intake boosting is key to achieving high loads with dilute combustion, and it also enhances the fuel's autoignition reactivity, reducing the required intake heating or hot residuals. These effects have the advantages of increasing TE and charge density, allowing greater timing retard with good stability, and making the fuel Φ- sensitive so that partial fuel stratification (PFS) can be applied for higher loads and further TE improvements. However, at high boost the autoignition reactivity enhancement can become excessive, and substantial amounts of EGR are required to prevent overly advanced combustion. Accordingly, an experimental investigation has been conducted to determine how the tradeoff between the effects of intake boost varies with fuel-type and its impact on load range and TE. Five fuels are investigated: a conventional AKI=87 petroleum-based gasoline (E0), and blends of 10 and 20% ethanol with this gasoline to reduce its reactivity enhancement with boost (E10 and E20). Furthermore, a second zero-ethanol gasoline with AKI=93 (matching that of E20) was also investigated (CF-E0), and some neat ethanol data are also reported.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Secretary of Energy (S)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1237376
Report Number(s):
SAND-2015-1408J; 567248
Journal Information:
SAE International Journal of Engines (Online), Vol. 8, Issue 3; ISSN 1946-3944
Publisher:
SAE InternationalCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Understanding partial fuel stratification for low temperature gasoline combustion using large eddy simulations journal June 2020
The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline journal January 2019
Effect of engine size, speed, and dilution method on thermal stratification of premixed homogeneous charge compression–ignition engines: A large eddy simulation study journal January 2019
Impact of injection strategies on combustion characteristics, efficiency and emissions of gasoline compression ignition operation in a heavy-duty multi-cylinder engine journal September 2018

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Related Subjects

42 ENGINEERING
ethanol
gasoline
HCCI engines
combustion/combustion processes