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<p>Pre-chamber ignition technology can address the issue of uneven in-cylinder mixture combustion in large-bore marine engines. The impact of various pre-chamber structures on the formation of the mixture and jet flames within the pre-chamber is explored. This study performed numerical simulations on a large-bore marine ammonia/hydrogen pre-chamber engine prototype, considering pre-chamber volume, throat diameter, the distance between the hydrogen injector and the spark plug, and the hydrogen injector angle. Compared with the original engine, when the pre-chamber volume is 73.4 ml, the throat diameter is 14 mm, the distance ratio is 0.92, and the hydrogen injector angle is 80°. Moreover, the peak pressure in the pre-chamber increased by 23.1%, and that in the main chamber increased by 46.3%. The results indicate that the performance of the original engine is greatly enhanced by altering its fuel and pre-chamber structure.</p>

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Influence of Geometric Parameters of Pre-Chamber on Mixture Formation in Marine Ammonia/Hydrogen Engines

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Shuzhe Yan,
  • Shengli Wei,
  • Yuhao Lu,
  • Yuanchen Li,
  • Yuhan Li

摘要

Pre-chamber ignition technology can address the issue of uneven in-cylinder mixture combustion in large-bore marine engines. The impact of various pre-chamber structures on the formation of the mixture and jet flames within the pre-chamber is explored. This study performed numerical simulations on a large-bore marine ammonia/hydrogen pre-chamber engine prototype, considering pre-chamber volume, throat diameter, the distance between the hydrogen injector and the spark plug, and the hydrogen injector angle. Compared with the original engine, when the pre-chamber volume is 73.4 ml, the throat diameter is 14 mm, the distance ratio is 0.92, and the hydrogen injector angle is 80°. Moreover, the peak pressure in the pre-chamber increased by 23.1%, and that in the main chamber increased by 46.3%. The results indicate that the performance of the original engine is greatly enhanced by altering its fuel and pre-chamber structure.