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Study of Efficient and Clean Combustion of Diesel–Natural Gas Engine at High Loads with TAC-HCCI Combustion

Author

Listed:
  • Min Zhang

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Wenyu Gu

    (China North Engine Research Institute, Tianjin 300072, China)

  • Zhi Jia

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Wanhua Su

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

Abstract

This study proposes an innovative Thermodynamic Activity Controlled Homogeneous Charge Compression Ignition (TAC-HCCI) strategy for diesel–natural gas dual-fuel engines, aiming to achieve high thermal efficiency while maintaining low emissions. By employing numerical simulation methods, the effects of the intake pressure, intake temperature, EGR rate, intake valve closing timing, diesel injection timing, diesel injection pressure, and diesel injection quantity on engine combustion, energy distribution, and emission characteristics were systematically investigated. Through a comprehensive analysis of optimized operating conditions, a high-efficiency and low-emission TAC-HCCI combustion technology for dual-fuel engines was developed. The core mechanism of TAC-HCCI combustion control was elucidated through an analysis of the equivalence ratio and temperature distribution of the in-cylinder mixture. The results indicate that under the constraints of PCP ≤ 30 ± 1 MPa and RI ≤ 5 ± 0.5 MW/m 2 , the TAC-HCCI technology achieves a gross indicated mean effective pressure (IMEPg) of 24.0 bar, a gross indicated thermal efficiency (ITEg) of up to 52.0%, and indicated specific NOx emissions (ISNOx) as low as 1.0 g/kW∙h. To achieve low combustion loss, reduced heat transfer loss, and high thermal efficiency, it is essential to ensure the complete combustion of the mixture while maintaining low combustion temperatures. Moreover, a reduced diesel injection quantity combined with a high injection pressure can effectively suppress NOx emissions.

Suggested Citation

  • Min Zhang & Wenyu Gu & Zhi Jia & Wanhua Su, 2025. "Study of Efficient and Clean Combustion of Diesel–Natural Gas Engine at High Loads with TAC-HCCI Combustion," Energies, MDPI, vol. 18(15), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4121-:d:1716714
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    References listed on IDEAS

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    1. Papagiannakis, R.G. & Kotsiopoulos, P.N. & Zannis, T.C. & Yfantis, E.A. & Hountalas, D.T. & Rakopoulos, C.D., 2010. "Theoretical study of the effects of engine parameters on performance and emissions of a pilot ignited natural gas diesel engine," Energy, Elsevier, vol. 35(2), pages 1129-1138.
    2. Rahnama, Pourya & Paykani, Amin & Reitz, Rolf D., 2017. "A numerical study of the effects of using hydrogen, reformer gas and nitrogen on combustion, emissions and load limits of a heavy duty natural gas/diesel RCCI engine," Applied Energy, Elsevier, vol. 193(C), pages 182-198.
    3. Min Zhang & Wanhua Su & Zhi Jia, 2024. "Study of Efficient and Clean Combustion of Diesel–Natural Gas Engine at Low Loads with Concentration and Temperature Stratified Combustion," Energies, MDPI, vol. 17(17), pages 1-22, August.
    4. Khan, Muhammad Imran & Yasmin, Tabassum & Shakoor, Abdul, 2015. "Technical overview of compressed natural gas (CNG) as a transportation fuel," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 785-797.
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