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Combustion Performance and Low NOx Emissions of a Dimethyl Ether Compression-Ignition Engine at High Injection Pressure and High Exhaust Gas Recirculation Rate

Author

Listed:
  • Inmo Youn

    (Korean Institute of Energy Technology Evaluation and Planning, 14 Teheran-ro 114 Gil, Gangnam-gu, Seoul 06175, Korea)

  • Joonho Jeon

    (Department of Fire Protection Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea)

Abstract

Dimethyl ether (DME) is a promising alternative to diesel for compression-ignition (CI) engines used in various industrial applications. However, the high nitrogen oxide (NOx) emissions of DME combustion have restricted its use. The primary cause of high NOx emissions is a high combustion temperature. In this study, a high exhaust gas recirculation (EGR) rate was used when testing a common-rail direct injection CI engine suitable (with minor modifications) for a passenger car. A modified fuel supply system created high injection pressure during evaluation of combustion performance. The physical and chemical properties of DME were the principal determinants of the ignition delay, combustion speed, and heat release rate. Although a high injection pressure accelerated formation of the fuel-air mixture and the combustion speed, combustion performance deteriorated with increased NOx emissions. An increased EGR rate affected combustion and the NOx concentration. A high EGR rate effectively reduced NOx formation and emission under low-temperature combustion conditions. Also, the good DME combustion characteristics were maintained when the EGR rate was high, unlike for an ultra-low sulfur diesel engine.

Suggested Citation

  • Inmo Youn & Joonho Jeon, 2022. "Combustion Performance and Low NOx Emissions of a Dimethyl Ether Compression-Ignition Engine at High Injection Pressure and High Exhaust Gas Recirculation Rate," Energies, MDPI, vol. 15(5), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1912-:d:765076
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    References listed on IDEAS

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    1. Jeon, Joonho & Kwon, Sang Il & Park, Yong Hee & Oh, Yunjung & Park, Sungwook, 2014. "Visualizations of combustion and fuel/air mixture formation processes in a single cylinder engine fueled with DME," Applied Energy, Elsevier, vol. 113(C), pages 294-301.
    2. Paweł Fabiś & Bartosz Flekiewicz, 2021. "Influence of LPG and DME Composition on Spark Ignition Engine Performance," Energies, MDPI, vol. 14(17), pages 1-18, September.
    3. Ayat Gharehghani & Alireza Kakoee & Amin Mahmoudzadeh Andwari & Thanos Megaritis & Apostolos Pesyridis, 2021. "Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies," Energies, MDPI, vol. 14(6), pages 1-25, March.
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    1. Tadeusz Dziubak & Mirosław Karczewski, 2022. "Experimental Studies of the Effect of Air Filter Pressure Drop on the Composition and Emission Changes of a Compression Ignition Internal Combustion Engine," Energies, MDPI, vol. 15(13), pages 1-31, June.

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