Dual-Fuel (DF) engines offer great fuel flexibility since they can either run on gaseous or liquid fuels. In the case of Diesel pilot ignited DF-engines the main source of energy is provided by gaseous fuel, whereas the Diesel fuel acts only as an ignition source. Therefore, a proper autoignition of the pilot fuel is of utmost importance for combustion in DF-engines. However, autoignition of the pilot fuel suffers from lower compression temperatures of Miller or Atkinson valve timings. These valve timings are applied to increase efficiency and lower nitrogen oxide engine emissions. In order to improve the ignition, it is necessary to understand which parameters influence the ignition in DF-engines. For this purpose, experiments were conducted and the influence of parameters such as injection pressure, pilot fuel quantity, compression temperature and air-fuel equivalence ratio of the homogenous natural gas-air mixture were investigated. The experiments were performed on a periodically chargeable combustion cell using optical high-speed recordings and thermodynamic measurement techniques for pressure and temperature. The study reveals that the quality of the Diesel pilot ignition in terms of short ignition delay and a high number of ignited sprays significantly depends on the injection parameters and operating conditions. In most cases, the pilot fuel suffers from too high dilution due to its small quantity and long ignition delays. This results in a small number of ignited sprays and consequently leads to longer combustion durations. Furthermore, the experiments confirm that the natural gas of the background mixture influences the autoignition of the Diesel pilot oil.
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ASME 2017 Internal Combustion Engine Division Fall Technical Conference
October 15–18, 2017
Seattle, Washington, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5831-8
PROCEEDINGS PAPER
Influence of Injection Parameters and Operating Conditions on Ignition and Combustion in Dual-Fuel Engines
Marcus Grochowina,
Marcus Grochowina
Technical University of Munich, Garching, Germany
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Michael Schiffner,
Michael Schiffner
Technical University of Munich, Garching, Germany
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Simon Tartsch,
Simon Tartsch
Technical University of Munich, Garching, Germany
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Thomas Sattelmayer
Thomas Sattelmayer
Technical University of Munich, Garching, Germany
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Marcus Grochowina
Technical University of Munich, Garching, Germany
Michael Schiffner
Technical University of Munich, Garching, Germany
Simon Tartsch
Technical University of Munich, Garching, Germany
Thomas Sattelmayer
Technical University of Munich, Garching, Germany
Paper No:
ICEF2017-3549, V001T01A003; 12 pages
Published Online:
November 30, 2017
Citation
Grochowina, M, Schiffner, M, Tartsch, S, & Sattelmayer, T. "Influence of Injection Parameters and Operating Conditions on Ignition and Combustion in Dual-Fuel Engines." Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Volume 1: Large Bore Engines; Fuels; Advanced Combustion. Seattle, Washington, USA. October 15–18, 2017. V001T01A003. ASME. https://doi.org/10.1115/ICEF2017-3549
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