Effects on numerical calculations of in-flight particle trajectories and temperatures considering multiple particle size and shape

Knoll, Mario; Gerhardter, Hannes; Prieler, René Josef; Hochenauer, Christoph; Tomazic, P.; Schröttner, Hartmuth

doi:10.1016/j.ijft.2020.100021

Cited by 2 publications

(1 citation statement)

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“…The potential of EA in Diesel engines was already considered by the Authors by a preliminary study [16], analysing the effects of oxygen enriched air on the exhaust emissions and performance of a high-speed direct-injection Diesel engine, by means of 3D Computational Fluid Dynamics (CFD) simulations. The numerical approach has been selected since up-to-date CFD software are able to provide realistic simulations and reliable results of complex phenomena with costs that are very low in comparison with experiments in many engineering fields [17] [18] [19]. The preliminary CFD simulations demonstrated that EA mixture allows to increase engine thermal efficiency up to 8 %, thanks to a faster and more complete combustion, and drastically reduces soot emissions.…”

Section: Introductionmentioning

confidence: 99%

Effects of humidified enriched air on combustion and emissions of a diesel engine

et al. 2020

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The potential of Humidified Enriched Air (HEA) on Diesel engine combustion is investigated, by means of 3D CFD combustion simulations, on a current production 4-cylinder turbocharged Diesel engine. HEA is supposed to be obtained by water degassing operation, exploiting the different vapor-liquid equilibria of it main constituents, nitrogen and oxygen. Simulations are carried out using a customized version of the KIVA 3V code, featuring a detailed chemistry combustion mechanism. The model of the engine is previously validated through comparison with experimental data and then it is used to analyse combustion and emissions of HEA combustion in combination with late injection strategies. Numerical results demonstrate that oxygen-enriched air enhances the thermal efficiency of the engine (up to 13%) and reduces significantly soot emissions; on the other hand, in-cylinder peak pressure and NOx emissions increase. The latter can be significantly reduced by using humidified air maintaining the advantage in terms of thermal efficiency and in soot reduction, nevertheless the baseline case NOx emissions cannot be restored.

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