期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 1, 页码 1302-1314出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.10.006
关键词
Hydrogen direct injection; Injection timing; Diesel engine; Dual-fuel combustion; Hydrogen energy fraction
资金
- Sydney, Australia
- Australian Renewable Energy Agency (ARENA)
The implementation of hydrogen-diesel dual direct injection technology in a compression-ignition engine can improve efficiency and reduce noise and emissions, with the choice of injection timing affecting combustion behavior.
Hydrogen-diesel dual direct-injection (H2DDI) is successfully implemented in a compression-ignition engine, which is developed to circumvent the pre-ignition and knocking limitations inherent to port fuel-injection hydrogen engines. An automotive-size single-cylinder common-rail diesel engine was modified to fit an additional high-pressure hydrogen injector in the cylinder head. The engine is operated at intermediate load with constant fuel-energy input using an energy-substitution principle - the diesel injection duration is decreased as the hydrogen amount is increased while adjusting the diesel injection timing to fix the combustion phasing. The results show that, at early hydrogen injection timings, the heat release rate and engine-out emissions show trends indicating premixed combustion whereas later injection timings exhibit hydrogen mixing-controlled combustion behaviour. At 50% hydrogen substitution ratio and optimised direct injection timing of 40 degrees CA bTDC, the uncompromised indicated efficiency of 47% is achieved while the combustion-induced noise is decreased by 6 dB and the engine-out NOx emission is kept below 11 g/kWh. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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