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Comparative Study of Spark-Ignited and Pre-Chamber Hydrogen-Fueled Engine: A Computational Approach

Author

Listed:
  • Hammam Aljabri

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

  • Mickael Silva

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

  • Moez Ben Houidi

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

  • Xinlei Liu

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

  • Moaz Allehaibi

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
    Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Mecca 24382, Saudi Arabia)

  • Fahad Almatrafi

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

  • Abdullah S. AlRamadan

    (Transport Technologies Division, R&DC, Saudi Aramco, Dhahran 34466, Saudi Arabia)

  • Balaji Mohan

    (Transport Technologies Division, R&DC, Saudi Aramco, Dhahran 34466, Saudi Arabia)

  • Emre Cenker

    (Transport Technologies Division, R&DC, Saudi Aramco, Dhahran 34466, Saudi Arabia)

  • Hong G. Im

    (Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia)

Abstract

Hydrogen is a promising future fuel to enable the transition of transportation sector toward carbon neutrality. The direct utilization of H 2 in internal combustion engines (ICEs) faces three major challenges: high NO x emissions, severe pressure rise rates, and pre-ignition at mid to high loads. In this study, the potential of H 2 combustion in a truck-size engine operated in spark ignition (SI) and pre-chamber (PC) mode was investigated. To mitigate the high pressure rise rate with the SI configuration, the effects of three primary parameters on the engine combustion performance and NO x emissions were evaluated, including the compression ratio (CR), the air–fuel ratio, and the spark timing. In the simulations, the severity of the pressure rise was evaluated based on the maximum pressure rise rate (MPRR). Lower compression ratios were assessed as a means to mitigate the auto-ignition while enabling a wider range of engine operation. The study showed that by lowering CR from 16.5:1 to 12.5:1, an indicated thermal efficiency of 47.5% can be achieved at 9.4 bar indicated mean effective pressure (IMEP) conditions. Aiming to restrain the auto-ignition while maintaining good efficiency, growth in λ was examined under different CRs. The simulated data suggested that higher CRs require a higher λ, and due to practical limitations of the boosting system, λ at 4.0 was set as the limit. At a fixed spark timing, using a CR of 13.5 combined with λ at 3.33 resulted in an indicated thermal efficiency of 48.6%. It was found that under such lean conditions, the exhaust losses were high. Thus, advancing the spark time was assessed as a possible solution. The results demonstrated the advantages of advancing the spark time where an indicated thermal efficiency exceeding 50% was achieved while maintaining a very low NO x level. Finally, the optimized case in the SI mode was used to investigate the effect of using the PC. For the current design of the PC, the results indicated that even though the mixture is lean, the flame speed of H 2 is sufficiently high to burn the lean charge without using a PC. In addition, the PC design used in the current work induced a high MPRR inside the PC and MC, leading to an increased tendency to engine knock. The operation with PC also increased the heat transfer losses in the MC, leading to lower thermal efficiency compared to the SI mode. Consequently, the PC combustion mode needs further optimizations to be employed in hydrogen engine applications.

Suggested Citation

  • Hammam Aljabri & Mickael Silva & Moez Ben Houidi & Xinlei Liu & Moaz Allehaibi & Fahad Almatrafi & Abdullah S. AlRamadan & Balaji Mohan & Emre Cenker & Hong G. Im, 2022. "Comparative Study of Spark-Ignited and Pre-Chamber Hydrogen-Fueled Engine: A Computational Approach," Energies, MDPI, vol. 15(23), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:8951-:d:985254
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    References listed on IDEAS

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