Gasoline fuels properties for multi-mode operation – Observations in a GDI and the CFR engine

Shah, Ashish; Hoth, Alexander; Kolodziej, Christopher P.; Rockstroh, Toby

doi:10.1016/j.fuel.2020.119680

Gasoline fuels properties for multi-mode operation – Observations in a GDI and the CFR engine

Journal Article · Fri Feb 05 00:00:00 EST 2021 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2020.119680· OSTI ID:1798178

Shah, Ashish ^[1]; Hoth, Alexander ^[1]; Kolodziej, Christopher P. ^[1]; Rockstroh, Toby ^[1]

Argonne National Laboratory (ANL), Argonne, IL (United States)

The combustion behavior of five full boiling range RON98 gasoline blends was evaluated for multi-mode operation in a GDI and the CFR octane rating engine. The GDI engine tests were conducted with stoichiometric air-fuel ratio in spark-ignition (SI), and with air-diluted homogeneous charge compression ignition (HCCI) mode. In the CFR engine, the knocking combustion was analyzed under standard RON testing conditions at both peak knocking lambda and stoichiometric air-fuel ratios, whereas compression ignited operation was characterized by utilizing the HCCI number test protocol. Disparate knock limited SI and HCCI combustion behavior was observed for the test fuels, despite four of the fuels having the same RON and octane sensitivity. It was found that knock-limited combustion phasing in the GDI engine did not align well with the RON. However, a detailed comparison of knock-limited SI operation in the GDI and CFR engine revealed that a more appropriate effective RON based on a common knock intensity metric (MAPO) and stoichiometric air-fuel ratio resulted in comparable knock characterization between the two engine platforms. Furthermore, the critical intake air temperature and the critical compression ratio were proposed to characterize knock-limited SI operation, while the minimum intake air heating and compression ratio were used to define a fuel's autoignition propensity for compression ignition operation in the GDI and CFR engine, respectively. Finally, each fuel's characteristic compression ratio needed to obtain knock-limited SI (KLSI) and HCCI operation was used to calculate an effective multi-mode octane number (MM-ON) based on the primary reference fuel blends.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1798178

Journal Information:: Fuel, Journal Name: Fuel Vol. 291; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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