Analysis of the effect of the hydrogen as main fuel on the performance of a modified compression ignition engine with water injection. (15th April 2019)

• Record Type: Journal Article
• Authors: Serrano, J.; Jiménez-Espadafor, F.J.; López, A.
• Is Part Of: Energy. Volume 173(2019)
• Page Start: 911
• Page End: 925
• Publication Date: 2019-04-15
• 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.2019.02.116
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The currently available technologies for controlling emissions in internal combustion engines may not be sufficient to achieve the very low emission levels imposed by future legislation. The utilisation of gaseous hydrogen (H2 ) in CI engines is a viable option for simultaneously solving the problems of energy efficiency improvements and emissions reduction, including greenhouse gases (GHG). This paper is a part of a wider study devoted to the analysis of dual combustion (diesel-hydrogen) in internal combustion engines. In this paper, a diesel engine is modified to run using a hydrogen-diesel mixture as fuel, with diesel fuel used alone as the ignition source. This mode of operation is studied for two speeds and various injection strategies, with hydrogen as the main fuel and diesel for ignition, up to a hydrogen/diesel mass ratio of 1.75. In order to control NOx emissions, intake self-ignition and combustion knocking, water was injected into the intake manifold (WI). The test results show that smoke emissions decrease with an increase in the hydrogen/diesel ratio. Conversely, NOx emissions increase with the hydrogen fraction, but water injection produces a reduction in the NOx emissions of around 50%. An almost flat efficiency of close to 40% is observed. Highlights: Effect of H2 as main fuel with diesel fuel used alone as the ignition source. Hydrogen/diesel ratios from 0 to 1.75 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%. The efficiency is close to 40%.