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. (1st April 2019)

• Record Type: Journal Article
• Authors: Serrano, J.; Jiménez-Espadafor, F.J.; López, A.
• Is Part Of: Energy. Volume 172(2019)
• Page Start: 702
• Page End: 711
• Publication Date: 2019-04-01
• Subjects: Hydrogen -- Water injection -- Diesel engine -- Dual-fuel -- Emissions -- Heat release rate; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2019.02.027
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: 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. Highlights: Effect of H2-diesel in dual-fuel mode was investigated in a modified CI engine. Hydrogen/diesel ratios from 0 to 1 were investigated. Water injection (WI) to control NOx emissions, intake self-ignition and knocking. NOx emissions increase with the hydrogen, but WI reduces the NOx around 50–60%. A functional law that allows us to reproduce the HRR through some initial parameters.