The impact of physicochemical property interactions of iso -octane/ethanol blends on ignition timescales

Barraza-Botet, Cesar L.; Luecke, Jon; Zigler, Bradley T.; Wooldridge, Margaret S.

doi:10.1016/j.fuel.2018.03.105

Title: The impact of physicochemical property interactions of iso -octane/ethanol blends on ignition timescales

Journal Article · Tue Mar 20 00:00:00 EDT 2018 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2018.03.105· OSTI ID:1431423

Barraza-Botet, Cesar L. ^[1]; Luecke, Jon ^[2]; Zigler, Bradley T. ^[2]; Wooldridge, Margaret S. ^[1]

Univ. of Michigan, Ann Arbor, MI (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

This work presents new measurements of liquid fuel ignition delay times of iso-octane and ethanol fuel blends obtained from an ignition quality tester at the National Renewable Energy Laboratory (NREL IQT), which are compared to previous ignition delay data from the University of Michigan rapid compression facility (UM RCF), at the same experimental conditions. Pressure-time histories were used to determine liquid fuel ignition delays at global stoichiometric non-premixed conditions for iso-octane, ethanol and iso-octane/ethanol blends of 25, 50, 75% by volume in mixtures of 10% oxygen diluted in nitrogen. Temperatures ranging from 880 to 970 K were studied at a pressure of 10 atm. By comparing total ignition delay times from the NREL IQT with chemical ignition delay times from the UM RCF, the contributions of physical phenomena were quantified as representative time scales for spray injection, breakup and evaporation processes, and for gas-phase turbulent mixing. Regression analyses were developed for ignition time scales as function of blend level and charge temperature. Non-dimensional analyses were also carried out to determine the relative effects of physical time scales with respect to chemical ignition delay times.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308; SC0002645; DE347AC36-99GO10337

OSTI ID:: 1431423

Alternate ID(s):: OSTI ID: 1548554

Report Number(s):: NREL/JA-5400-71009; MainId:21373; UUID:bcd14d2d-2518-e811-9c12-2c44fd93e385; MainAdminID:9849

Journal Information:: Fuel, Vol. 224, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Title: The impact of physicochemical property interactions of iso -octane/ethanol blends on ignition timescales

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