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

Author(s):: Shuzhe Yan; Shengli Wei; Yuhao Lu; Yuanchen Li; Yuhan Li

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Keywords:: Pre-chamber ignition; Ammonia/hydrogen fuel; Pre-chamber mixture formation; Jet characteristics; Marine engine

DOI:: 10.1007/s11804-025-00690-9

Abstract:: 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.

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Journal of Marine Science and Application[ISSN:1002-2848/CN:61-1400/f]

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