Investigating Combustion Enhancement and Emissions Reduction with the Addition of 2H2 + O2 to a SI Engine
Date Published: 2003-09-16
Paper Number:2003-32-0011
DOI: 10.4271/2003-32-0011
Citation:
D'Andrea, T., Henshaw, P., Ting, D., and Sobiesiak, A., "Investigating Combustion Enhancement and Emissions Reduction with the Addition of 2H2 + O2 to a SI Engine," SAE Technical Paper 2003-32-0011, 2003, doi:10.4271/2003-32-0011.
This research involved studying the effects of adding small amounts of hydrogen or hydrogen and oxygen to a gasoline fuelled spark ignition (SI) engine at part load. The hydrogen and oxygen were added in a ratio of 2:1, mimicking the addition of water electrolysis products. It was found that the effects of hydrogen addition (≈ 2.8% of the fuel by mass, ≈ 60% by volume) decreased as the fuel/air equivalence ratio approached ϕ = 1. When operating at ϕ ≤ 0.8, the torque, indicated mean effective pressure (imep) and NO emissions increased and cycle-to-cycle variation decreased with hydrogen addition. The improvements in engine performance and increase in NO emissions were related to a faster burn rate shown by a decrease in burn duration with the addition of hydrogen. Further, the addition of hydrogen only and hydrogen and oxygen in a ratio of 2:1 were compared. The extra oxygen had little effect on engine performance other than an increase in NO exhaust concentration ∼ 500 ppm. Under the conditions tested, the power necessary to generate the hydrogen on board through electrolysis was greater than what was gained from the engine.
Purchase more technical papers and save! With TechSelect,
you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
Learn more >
