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Analysis of the effect of different hydrogen/diesel ratios on the performance and emissions of a modified compression ignition engine under dual-fuel mode with water injection. Hydrogen-diesel dual-fuel mode

Serrano, J., Jiménez-Espadafor, F.J., López, A.
Energy 2019 v.172 pp. 702-711
carbon dioxide, combustion, diesel engines, emissions, energy efficiency, fuels, greenhouse gases, heat, hydrogen, nitrogen oxides, smoke
The utilisation of gaseous hydrogen (H2) in compression ignition (CI) engines is a viable option for simultaneously solving the problems of energy efficiency improvements and emissions reduction, including greenhouse gases because combustion does not produce CO2. This paper is the second of three of a study devoted to the analysis of dual combustion (diesel-H2) in internal combustion engines. In this Part II, a diesel engine is modified to run using a hydrogen-diesel mixture as a dual fuel. This mode of operation has been studied for two speeds and different diesel injection strategies, up to a H2/diesel mass ratio of 1. In order to control NOx emissions, intake self-ignition and combustion knocking, water was injected into the intake manifold. The test results show that smoke emissions decrease and NOx emissions increase with an increase in the H2/diesel ratio, but water injection produces a reduction in the NOx emissions of around 50%, with an almost flat efficiency of 37%. This article contains a study of the parametrization of the heat release rate (HRR) to obtain a functional law that allows us to reproduce the HRR through several initial parameters for the cases studied in Parts I (H2 as main fuel) and II.