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Experimental Characterization of Hydrocarbons and Nitrogen Oxides Production in a Heavy-Duty Diesel–Natural Gas Reactivity-Controlled Compression Ignition Engine

Author

Listed:
  • Giacomo Silvagni

    (Department of Industrial Engineering—DIN, University of Bologna, 40126 Bologna, Italy)

  • Abhinandhan Narayanan

    (Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA)

  • Vittorio Ravaglioli

    (Department of Industrial Engineering—DIN, University of Bologna, 40126 Bologna, Italy)

  • Kalyan Kumar Srinivasan

    (Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA)

  • Sundar Rajan Krishnan

    (Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA)

  • Nik Collins

    (Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA)

  • Paulius Puzinauskas

    (Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA)

  • Fabrizio Ponti

    (Department of Industrial Engineering—DIN, University of Bologna, 40126 Bologna, Italy)

Abstract

Reactivity-Controlled Compression Ignition (RCCI) combustion is considered one of the most promising Low-Temperature Combustion (LTC) concepts aimed at reducing greenhouse gases for the transportation and power generation sectors. Due to the spontaneous combustion of a lean, nearly homogeneous mixture of air and low-reactivity fuel (LRF), ignited through the direct injection of a small quantity of high-reactivity fuel (HRF), RCCI (dual-fuel) shows higher efficiency and lower pollutants compared to conventional diesel combustion (CDC) if run at very advanced injection timing. Even though a HRF is used, the use of advanced injection timing leads to high ignition delays, compared to CDC, and generates high cycle-to-cycle variability, limited operating range, and high pressure rise rates at high loads. This work presents an experimental analysis performed on a heavy-duty single-cylinder compression ignited engine in dual-fuel diesel–natural gas mode. The objective of the present work is to investigate and highlight the correlations between combustion behavior and pollutant emissions, especially unburned hydrocarbons (HC) and oxides of nitrogen (NOx). Based on the analysis of crank-resolved pollutants measurements performed through fast FID and fast NOx systems under different engine operating conditions, two correlations were found demonstrating a good accordance between pollutant production and combustion behavior: Net Cyclic Hydrocarbon emission—cyclic IMEP variations (R 2 = 0.86), and Cyclic NOx—maximum value of the Rate of Heat Released (R 2 = 0.82).

Suggested Citation

  • Giacomo Silvagni & Abhinandhan Narayanan & Vittorio Ravaglioli & Kalyan Kumar Srinivasan & Sundar Rajan Krishnan & Nik Collins & Paulius Puzinauskas & Fabrizio Ponti, 2023. "Experimental Characterization of Hydrocarbons and Nitrogen Oxides Production in a Heavy-Duty Diesel–Natural Gas Reactivity-Controlled Compression Ignition Engine," Energies, MDPI, vol. 16(13), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5164-:d:1186957
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    References listed on IDEAS

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    1. Paykani, Amin & Garcia, Antonio & Shahbakhti, Mahdi & Rahnama, Pourya & Reitz, Rolf D., 2021. "Reactivity controlled compression ignition engine: Pathways towards commercial viability," Applied Energy, Elsevier, vol. 282(PA).
    2. Giacomo Silvagni & Vittorio Ravaglioli & Stefania Falfari & Fabrizio Ponti & Valerio Mariani, 2022. "Development of a Control-Oriented Ignition Delay Model for GCI Combustion," Energies, MDPI, vol. 15(17), pages 1-29, September.
    3. Cheng, Qiang & Ahmad, Zeeshan & Kaario, Ossi & Martti, Larmi, 2019. "Cycle-to-cycle variations of dual-fuel combustion in an optically accessible engine," Applied Energy, Elsevier, vol. 254(C).
    4. Abhinandhan Narayanan & Deivanayagam Hariharan & Kendyl Ryan Partridge & Austin Leo Pearson & Kalyan Kumar Srinivasan & Sundar Rajan Krishnan, 2023. "Impact of Low Reactivity Fuel Type and Energy Substitution on Dual Fuel Combustion at Different Injection Timings," Energies, MDPI, vol. 16(4), pages 1-36, February.
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