Combustion, performance, regulated and unregulated emissions of a diesel engine with hydrogen addition

CATEGORY: DIESEL
Applied Energy, Volume 126, 1 August 2014, Pages 1–12
Combustion, performance, regulated and unregulated emissions of a diesel engine with hydrogen addition
J.H. ZhouCorresponding author contact information, E-mail the corresponding author,
C.S. Cheung, C.W. Leung
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Abstract
Reports a study of the combustion, performance, regulated and unregulated emissions of a diesel engine with naturally aspirated hydrogen at the engine speed of 1800 rev min⁻¹ under five engine loads.
Hydrogen was added to provide 10%, 20%, 30% and 40% of the total fuel energy. Improvement of engine performance can be achieved at medium to high loads. At 90% load, abnormal combustion occurs with more than 30% hydrogen addition as indicated by the drastic increase of peak heat release rate, shortened ignition delay and combustion duration. CO/CO₂ and seven kinds of unregulated emissions (except for formaldehyde) can be efficiently reduced. Researchers noted a drastic increase of NO₂ at low to medium engine loads. Reductions on particulate mass concentration, particle number concentration and diesel thermal pyrolysis intermediates (olefins and benzene) are associated with the inhibition of polycyclic aromatic hydrocarbons (PAHs) formation.
Full Text Source (Subscription or Fee): http://www.sciencedirect.com/science/article/pii/S0306261914003298