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Effects of Mixture Stratification on Combustion and Emissions of Boosted Controlled Auto-Ignition Engines

Author

Listed:
  • Jacek Hunicz

    (Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland)

  • Aymen Tmar

    (National Engineering School of Sfax, University of Sfax, Aeroport Road Km 0.5, BP 1169 .3029 Sfax, Tunisia)

  • Paweł Krzaczek

    (Faculty of Production Engineering, University of Life Sciences, Gleboka 28, 20-612 Lublin, Poland)

Abstract

The stratification of in-cylinder mixtures appears to be an effective method for managing the combustion process in controlled auto-ignition (CAI) engines. Stratification can be achieved and controlled using various injection strategies such as split fuel injection and the introduction of a portion of fuel directly before the start of combustion. This study investigates the effect of injection timing and the amount of fuel injected for stratification on the combustion and emissions in CAI engine. The experimental research was performed on a single cylinder engine with direct gasoline injection. CAI combustion was achieved using negative valve overlap and exhaust gas trapping. The experiments were performed at constant engine fueling. Intake boost was applied to control the excess air ratio. The results show that the application of the late injection strategy has a significant effect on the heat release process. In general, the later the injection is and the more fuel is injected for stratification, the earlier the auto-ignition occurs. However, the experimental findings reveal that the effect of stratification on combustion duration is much more complex. Changes in combustion are reflected in NO X emissions. The attainable level of stratification is limited by the excessive emission of unburned hydrocarbons, CO and soot.

Suggested Citation

  • Jacek Hunicz & Aymen Tmar & Paweł Krzaczek, 2017. "Effects of Mixture Stratification on Combustion and Emissions of Boosted Controlled Auto-Ignition Engines," Energies, MDPI, vol. 10(12), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:2172-:d:123533
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    References listed on IDEAS

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    1. Lee, Kyeonghyeon & Cho, Seokwon & Kim, Namho & Min, Kyoungdoug, 2015. "A study on combustion control and operating range expansion of gasoline HCCI," Energy, Elsevier, vol. 91(C), pages 1038-1048.
    2. Li, Nan & Xie, Hui & Chen, Tao & Li, Le & Zhao, Hua, 2013. "The effects of intake backflow on in-cylinder situation and auto ignition in a gasoline controlled auto ignition engine," Applied Energy, Elsevier, vol. 101(C), pages 756-764.
    3. Yang, Dong-bo & Wang, Zhi & Wang, Jian-Xin & Shuai, Shi-jin, 2011. "Experimental study of fuel stratification for HCCI high load extension," Applied Energy, Elsevier, vol. 88(9), pages 2949-2954.
    4. Hunicz, Jacek & Medina, Alejandro, 2016. "Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter," Energy, Elsevier, vol. 117(P2), pages 388-397.
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    Cited by:

    1. Slavin Viktor & Shuba Yevheniy & Caban Jacek & Matijosius Jonas & Rimkus Alfredas & Korpach Anatolii & Gutarevych Serhiy, 2022. "The Performance of a Car with Various Engine Power Systems – Part I," LOGI – Scientific Journal on Transport and Logistics, Sciendo, vol. 13(1), pages 130-140, January.
    2. Hunicz, Jacek & Mikulski, Maciej, 2018. "Investigation of the thermal effects of fuel injection into retained residuals in HCCI engine," Applied Energy, Elsevier, vol. 228(C), pages 1966-1984.
    3. Hunicz, Jacek & Mikulski, Maciej & Geca, Michal S. & Rybak, Arkadiusz, 2020. "An applicable approach to mitigate pressure rise rate in an HCCI engine with negative valve overlap," Applied Energy, Elsevier, vol. 257(C).
    4. Arkadiusz Małek & Agnieszka Dudziak & Ondrej Stopka & Jacek Caban & Andrzej Marciniak & Iwona Rybicka, 2022. "Charging Electric Vehicles from Photovoltaic Systems—Statistical Analyses of the Small Photovoltaic Farm Operation," Energies, MDPI, vol. 15(6), pages 1-18, March.

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