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Numerical comparative study of hydrogen addition on combustion and emission characteristics of a natural-gas/dimethyl-ether RCCI engine with pre-chamber

Author

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  • Kakoee, A.
  • Bakhshan, Y.
  • Gharehghani, A.
  • Salahi, M.M.

Abstract

Reactivity controlled compression ignition (RCCI) strategy uses two different fuels with independent reactivates which impacts combustion characteristics such as gross work, start of combustion (SOC) and burn duration as well as engines emissions. Effects of hydrogen addition have been numerically investigated on a RCCI natural-gas/di-methyl ether engine. For this purpose, six different percentages of H2(i.e.0,10,20,30,40 and 50%) has been evaluated. In all case studies total-heating values was kept constant. Numerical results showed increase in total gross work with the increase of hydrogen and up-to 19.7% boost by adding 50% of hydrogen. In the direction of adding hydrogen there are ascend in cumulative heat release which is about 15.9% with 50% of hydrogen. According to DME decomposition process, more than 10% of it was decomposed to its products, specially CH4 before SOC which affects fuel mixture Cetane number and in-cylinder heat release. Results showed advancement in combustion start about 5 CAD in 50% H2, it is about 7.8 CAD for CA50. Burn duration of using 50% H2 decreased about 6 CAD, approximately. Released CO and UHC descended 5.5 and 9.7 gr/kWh, respectively in 30% H2. Temperature and pressure also increased during hydrogen addition with 16.3 and 25.6% in 50% of hydrogen.

Suggested Citation

  • Kakoee, A. & Bakhshan, Y. & Gharehghani, A. & Salahi, M.M., 2019. "Numerical comparative study of hydrogen addition on combustion and emission characteristics of a natural-gas/dimethyl-ether RCCI engine with pre-chamber," Energy, Elsevier, vol. 186(C).
    • Handle: RePEc:eee:energy:v:186:y:2019:i:c:s0360544219315506
    DOI: 10.1016/j.energy.2019.115878
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    Citations

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    Cited by:

    1. Serdar Halis, 2023. "An Experimental Study of Operating Range, Combustion and Emission Characteristics in an RCCI Engine Fueled with Iso-Propanol/n-Heptane," Sustainability, MDPI, vol. 15(14), pages 1-24, July.
    2. Gharehghani, Ayat & Salahi, Mohammad Mahdi & Andwari, Amin Mahmoudzadeh & Mikulski, Maciej & Könnö, Juho, 2023. "Reactivity enhancement of natural gas/diesel RCCI engine by adding ozone species," Energy, Elsevier, vol. 274(C).
    3. Harari, P.A. & Banapurmath, N.R. & Yaliwal, V.S. & Khan, T.M. Yunus & Soudagar, Manzoore Elahi M. & Sajjan, A.M., 2020. "Experimental studies on performance and emission characteristics of reactivity controlled compression ignition (RCCI) engine operated with gasoline and Thevetia Peruviana biodiesel," Renewable Energy, Elsevier, vol. 160(C), pages 865-875.
    4. Moradi, Jamshid & Gharehghani, Ayat & Mirsalim, Mostafa, 2020. "Numerical investigation on the effect of oxygen in combustion characteristics and to extend low load operating range of a natural-gas HCCI engine," Applied Energy, Elsevier, vol. 276(C).
    5. Xie, Bo & Peng, Qingguo & E, Jiaqiang & Tu, Yaojie & Wei, Jia & Tang, Shihao & Song, Yangyang & Fu, Guang, 2022. "Effects of CO addition and multi-factors optimization on hydrogen/air combustion characteristics and thermal performance based on grey relational analysis," Energy, Elsevier, vol. 255(C).
    6. 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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