The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine

Vuilleumier, David; Atef, Nour; Kukkadapu, Goutham; Wolk, Benjamin; Selim, Hatem; Kozarac, Darko; Saxena, Samveg; Wang, Zhaowen; Sung, Chih-Jen; Dibble, Robert; Sarathy, S. Mani

doi:10.1021/acs.energyfuels.8b00887

Title: The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine

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Abstract

Autoignition in HCCI engines is known to be controlled by the combustion kinetics of the in-cylinder fuel/air mixture which is highly influenced by the amount of low-temperature and intermediate-temperature heat release (LTHR and ITHR) that occurs. At lower intake pressures (typically <1.4 bar absolute), it has been observed that gasoline behaves as a single-stage heat release fuel, while at higher intake pressures (typically >1.8 bar absolute) gasoline behaves as a two-stage heat release fuel. Furthermore, ethanol blending into gasoline strongly affects heat release characteristics, and this warrants further investigation. This paper experimentally investigates the conditions under which gasoline transitions from a single-stage heat release fuel to a two-stage heat release fuel as intake pressure is increased. Experiments were performed in single-cylinder HCCI engine fueled with two research-grade gasolines, FACE A and FACE C. These gasolines were tested neat, and with 10% and 20% (by volume) ethanol addition. In addition, these results were compared to results previously obtained for PRF 85, and new results for PRF 84 with 10% and 20% ethanol addition. Moreover, the engine experiments were supported by rapid compression machine (RCM) ignition delay data for the same fuels. The engine experiments revealed that there were minimal differences betweenmore »« less

Authors:

^[1]; Atef, Nour ^[2]; Kukkadapu, Goutham ^[3]; Wolk, Benjamin ^[1]; Selim, Hatem ^[4]; Kozarac, Darko ^[5]; Saxena, Samveg ^[6]; Wang, Zhaowen ^[7]; Sung, Chih-Jen ^[1]; Dibble, Robert ^[8];

^[2]

Univ. of California, Berkeley, CA (United States)
King Abdullah Univ. of Science and Technology (Saudi Arabia)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Connecticut, Storrs, CT (United States)
King Abdullah Univ. of Science and Technology (Saudi Arabia); GE Power, Dammam (Saudi Arabia)
Univ. of Zagreb (Croatia)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
Univ. of California, Berkeley, CA (United States); King Abdullah Univ. of Science and Technology (Saudi Arabia)

Publication Date:: Tue Sep 11 00:00:00 EDT 2018

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1481052

Report Number(s):: LLNL-JRNL-747155
Journal ID: ISSN 0887-0624; 932104

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Energy and Fuels

Additional Journal Information:: Journal Volume: 32; Journal Issue: 9; Journal ID: ISSN 0887-0624

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

Citation Formats


                    Vuilleumier, David, Atef, Nour, Kukkadapu, Goutham, Wolk, Benjamin, Selim, Hatem, Kozarac, Darko, Saxena, Samveg, Wang, Zhaowen, Sung, Chih-Jen, Dibble, Robert, and Sarathy, S. Mani. The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine.  United States: N. p., 2018. 
        Web.  doi:10.1021/acs.energyfuels.8b00887.

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                    Vuilleumier, David, Atef, Nour, Kukkadapu, Goutham, Wolk, Benjamin, Selim, Hatem, Kozarac, Darko, Saxena, Samveg, Wang, Zhaowen, Sung, Chih-Jen, Dibble, Robert, & Sarathy, S. Mani. The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine.  United States.  https://doi.org/10.1021/acs.energyfuels.8b00887

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                    Vuilleumier, David, Atef, Nour, Kukkadapu, Goutham, Wolk, Benjamin, Selim, Hatem, Kozarac, Darko, Saxena, Samveg, Wang, Zhaowen, Sung, Chih-Jen, Dibble, Robert, and Sarathy, S. Mani. 2018.  
        "The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine".  United States.  https://doi.org/10.1021/acs.energyfuels.8b00887.  https://www.osti.gov/servlets/purl/1481052.

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@article{osti_1481052,

  title        = {The Influence of Intake Pressure and Ethanol Addition to Gasoline on Single- and Dual-Stage Autoignition in an HCCI Engine},

  author       = {Vuilleumier, David and Atef, Nour and Kukkadapu, Goutham and Wolk, Benjamin and Selim, Hatem and Kozarac, Darko and Saxena, Samveg and Wang, Zhaowen and Sung, Chih-Jen and Dibble, Robert and Sarathy, S. Mani},

  abstractNote = {Autoignition in HCCI engines is known to be controlled by the combustion kinetics of the in-cylinder fuel/air mixture which is highly influenced by the amount of low-temperature and intermediate-temperature heat release (LTHR and ITHR) that occurs. At lower intake pressures (typically <1.4 bar absolute), it has been observed that gasoline behaves as a single-stage heat release fuel, while at higher intake pressures (typically >1.8 bar absolute) gasoline behaves as a two-stage heat release fuel. Furthermore, ethanol blending into gasoline strongly affects heat release characteristics, and this warrants further investigation. This paper experimentally investigates the conditions under which gasoline transitions from a single-stage heat release fuel to a two-stage heat release fuel as intake pressure is increased. Experiments were performed in single-cylinder HCCI engine fueled with two research-grade gasolines, FACE A and FACE C. These gasolines were tested neat, and with 10% and 20% (by volume) ethanol addition. In addition, these results were compared to results previously obtained for PRF 85, and new results for PRF 84 with 10% and 20% ethanol addition. Moreover, the engine experiments were supported by rapid compression machine (RCM) ignition delay data for the same fuels. The engine experiments revealed that there were minimal differences between the heat release profiles of the two gasolines, FACE A and FACE C, a result which was supported by the RCM experiments that showed similar ignition delay times for the two FACE fuels and PRF 84. On the other hand, with ethanol addition to these gasolines and PRF 84, the occurrence of LTHR shifted to higher intake pressures compared to ethanol-free cases, from 1.4 bar intake pressure for neat fuel to 2.2 bar with 20% ethanol. Consequently, the intake temperatures required to achieve constant combustion phasing for all mixtures were drastically altered. Simulations using a detailed chemical kinetic model were utilized to understand the effects of ethanol blending on the ignition characteristics of PRF 84. The addition of ethanol was found to act as a radical sink where it inhibits the radical pool formation during the low (<850 K) and intermediate (850–1050 K) temperature chemistry regimes resulting in lower reactivity. These results help explain ethanol’s significant antiknock qualities under boosted conditions in spark-ignition engines.},

  doi          = {10.1021/acs.energyfuels.8b00887},

  url          = {https://www.osti.gov/biblio/1481052},
  journal      = {Energy and Fuels},

  issn         = {0887-0624},

  number       = 9,

  volume       = 32,

  place        = {United States},

  year         = {Tue Sep 11 00:00:00 EDT 2018},

  month        = {Tue Sep 11 00:00:00 EDT 2018}

}

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