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Publication Detail
Hydrogen-diesel fuel co-combustion strategies in light duty and heavy duty CI engines
© 2018 The Authors The co-combustion of diesel fuel with H 2 presents a promising route to reduce the adverse effects of diesel engine exhaust pollutants on the environment and human health. This paper presents the results of H 2 -diesel co-combustion experiments carried out on two different research facilities, a light duty and a heavy duty diesel engine. For both engines, H 2 was supplied to the engine intake manifold and aspirated with the intake air. H 2 concentrations of up to 20% vol/vol and 8% vol/vol were tested in the light duty and heavy duty engines respectively. Exhaust gas circulation (EGR) was also utilised for some of the tests to control exhaust NO x emissions. The results showed NO x emissions increase with increasing H 2 in the case of the light duty engine, however, in contrast, for the heavy duty engine NO x emissions were stable/reduced slightly with H 2 , attributable to lower in-cylinder gas temperatures during diffusion-controlled combustion. CO and particulate emissions were observed to reduce as the intake H 2 was increased. For the light duty, H 2 was observed to auto-ignite intermittently before diesel fuel injection had started, when the intake H 2 concentration was 20% vol/vol. A similar effect was observed in the heavy duty engine at just over 8% H 2 concentration.
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