Computational Investigation of the Influence of Combustion Chamber Characteristics on a Heavy-Duty Ammonia Diesel Dual Fuel Engine

Youcef Sehili, Khaled Loubar (), Lyes Tarabet, Mahfoudh Cerdoun and Clément Lacroix
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Youcef Sehili: IMT Atlantique, GEPEA UMR CNRS 6144, F-44307 Nantes, France
Khaled Loubar: IMT Atlantique, GEPEA UMR CNRS 6144, F-44307 Nantes, France
Lyes Tarabet: Ecole Militaire Polytechnique, BP 17, Bordj-El-Bahri 16046, Algeria
Mahfoudh Cerdoun: Ecole Militaire Polytechnique, BP 17, Bordj-El-Bahri 16046, Algeria
Clément Lacroix: IMT Atlantique, GEPEA UMR CNRS 6144, F-44307 Nantes, France

Energies, 2024, vol. 17, issue 5, 1-19

Abstract: In response to increasingly stringent emissions regulations and the depletion of conventional fuel sources, integrating carbon-free fuels into the transport sector has become imperative. While hydrogen (H 2 ) presents significant technical challenges, ammonia (NH 3 ) could present a better alternative offering ease of transport, storage, and distribution, with both ecological and economic advantages. However, ammonia substitution leads to high emissions of unburned NH 3 , particularly at high loads. Combustion chamber retrofitting has proven to be an effective approach to remedy this problem. In order to overcome the problems associated with the difficult combustion of ammonia in engines, this study aims to investigate the effect of the piston bowl shape of an ammonia/diesel dual fuel engine on the combustion process. The primary objective is to determine the optimal configuration that offers superior engine performance under high load conditions and with high ammonia rates. In this study, a multi-objective optimization approach is used to control the creation of geometries and the swirl rate under the CONVERGE TM 3.1 code. To maximize indicated thermal efficiency and demonstrate the influence of hydrogen enrichment on ammonia combustion in ammonia/diesel dual fuel engines, a synergistic approach incorporating hydrogen enrichment of the primary fuel was implemented. Notably, the optimum configuration, featuring an 85% energy contribution from ammonia, outperforms others in terms of combustion efficiency and pollutant reduction. It achieves over 43% reduction in unburned NH 3 emissions and a substantial 31% improvement in indicated thermal efficiency.

Keywords: dual fuel engine; ammonia-diesel; combustion process; multi-objective optimization; emission performance; hydrogen enrichment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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