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- W4294414986 abstract "In this study ignition of premixed ammonia was tested using a compression-ignited (CI) pilot fuel. n-heptane (C7H16) was used as pilot fuel, injected with a GDI injector, enabling very small pilot fuel injections. With this setup, the engine was run using up to 98.5 % energy from ammonia – higher than seen in other CI-engine studies with ammonia at the time of writing. The ammonia energy contribution was varied 80–98.5 %, while keeping the total λ-value constant. An important result observed was an increase in combustion efficiency from 81%–90% with higher ammonia energy due to a lower local λ-value of the ammonia–air mixture, indicating that for ammonia-ignition an easily ignitable ammonia–air mixture is preferable compared to a strong pilot injection. Lean ammonia–air mixtures showed a gap in heat release between the pilot and ammonia combustion phases, which lowered the combustion efficiency. Increased ammonia energy led to reduced ammonia-slip and N2O-emissions and increased NO-emissions, and a lower CO-formation showed better pilot fuel oxidation." @default.
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- W4294414986 date "2023-01-01" @default.
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- W4294414986 title "Ignition and combustion study of premixed ammonia using GDI pilot injection in CI engine" @default.
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- W4294414986 doi "https://doi.org/10.1016/j.fuel.2022.125768" @default.
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