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Direct-Injected Hydrogen-Methane Mixtures in a Heavy-Duty Compression Ignition Engine
Technical Paper
2006-01-0653
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A diesel pilot-ignited, high-pressure direct-injection of natural gas heavy-duty single-cylinder engine was fuelled with both natural gas and blends of 10% and 23% by volume hydrogen in methane. A single operating condition (6 bar GIMEP, 0.5 ϕ, 800 RPM, 40%EGR) was selected, and the combustion phasing was varied from advanced (mid-point of combustion at top-dead-center) to late (mid-point of combustion at 15°ATDC). Replacing the natural gas with hydrogen/methane blend fuels was found to have a significant influence on engine emissions and on combustion stability. The use of 10%hydrogen was found to slightly reduce PM, CO, and tHC emissions, while improving combustion stability. 23%hydrogen was found to substantially reduce CO and tHC emissions, while slightly increasing NOx. The greatest reductions in CO and tHC, along with a significant reduction in PM, were observed at the latest combustion timings, where combustion stability was lowest. The high hydrogen-content fuel was found to reduce the ignition delay of the gaseous jet by approximately 20%, without influencing the ignition delay of the diesel pilot. The results were generally consistent at all combustion timings tested, and were found to be insensitive to injection pressure.
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Citation
McTaggart-Cowan, G., Jones, H., Rogak, S., Bushe, W. et al., "Direct-Injected Hydrogen-Methane Mixtures in a Heavy-Duty Compression Ignition Engine," SAE Technical Paper 2006-01-0653, 2006, https://doi.org/10.4271/2006-01-0653.Also In
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