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Title: Investigation and Optimization of Biodiesel Chemistry for HCCI Combustion

Over the past 5 years, ORNL has run 95 diesel range fuels in homogene-ous charge compression ignition (HCCI), including 40 bio-diesels and associated diesel fuels in their blending. The bio-diesel blends varied in oxygen content, iodine number, cetane, boiling point distribution, chemical composition, and some contained nitrogen. All fuels were run in an HCCI engine at 1800 rpm, in the power range of 2.5 to 4.5 bar IMEP, using intake air heating for combustion phasing control, and at a compression ratio of 10.6. The engine response to fuel variables has been analyzed statistically. Generally, the engine responded well to fuels with lower nitrogen and oxygen, lower cetane, and lower aromatics. Because of the wide range of fuels combined in the model, it provides only a broad overview of the engine response. It is recommended that data be truncated and re-modeled to obtain finer resolution of engine response to particular fuel variables.
 [1] ;  [1] ;  [1] ;  [2]
  1. ORNL
  2. Rincon Ranch Consulting
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Conference: International Conference on Sustainable Automotive technologies 2011, Greenville, SC, USA, 20110405, 20110406
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Fuels, Engines and Emissions Research Center
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Contributing Orgs:
Rincon Ranch Consulting
Country of Publication:
United States
33 ADVANCED PROPULSION SYSTEMS HCCI; biofuels; biodiesel; statistics; optimization