A LES study on the instantaneous H2 jet-ignited combustion characteristics of H2/NH3 mixtures

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 86, С. 382 - 394

Опубликована: Авг. 30, 2024

Язык: Английский

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The Influence of the Intake Geometry on the Performance of a Four-Stroke SI Engine for Aeronautical Applications

Energies, Год журнала: 2024, Номер 17(21), С. 5309 - 5309

Опубликована: Окт. 25, 2024

In this work, the influence of plenum and port geometry on performance intake process in a four-stroke spark ignition engine for ultralight aircraft applications is analyzed. Three systems are considered: so-called “standard plenum”, with relatively small volume, “V1 larger plenum” equipped large curvature manifold called “G2 port”. Both measurements 3D CFD simulations, by using Ansys® Academic Fluent, Release 20.2, performed to characterize analyze steady-flow field system selected valve lifts. The experimental data numerical results excellent agreement each other. show that at maximum lift, i.e., 12 mm, V1 allows an increase air mass flow rate 9.1% 9.4% compared standard port”, respectively. addition, volumetric efficiency has been estimated under unsteady-flow conditions all geometries high rpms. difference between less than 1% plenum, thus proving accuracy model, which then used study other configurations. shows fairly constant as speed increases, although such lower two considered work. Specifically, use port” leads 1.5% terms respect configuration original manifold. Furthermore, configuration, higher turbulent kinetic energy swirl tumble ratios observed. This expected result improvement air–fuel mixing flame propagation.

Язык: Английский

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The use of ammonia as a zero carbon heavy duty IC engine fuel for low criteria pollutant emissions– Simulation of an I.C. Engine with exhaust reforming

Fuel, Год журнала: 2024, Номер 384, С. 133538 - 133538

Опубликована: Дек. 10, 2024

Язык: Английский

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Development of an ammonia combustion model integrated in a 3D-CFD code for assessing the performance and NO emissions of an ammonia-hydrogen fueled spark-ignition engine

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 99, С. 739 - 751

Опубликована: Дек. 19, 2024

Язык: Английский

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Exploration of the application of passive pre-chamber ignition systems in ammonia-hydrogen engines: Rich, stoichiometric, and lean combustion evaluations

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 100, С. 466 - 476

Опубликована: Дек. 24, 2024

Язык: Английский

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