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 auto-ignition of the pilot fuel is of utmost importance for combustion in DF engines. However, auto-ignition 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 (NOx) 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 (A/F) 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 auto-ignition of the diesel pilot oil.
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October 2018
Research-Article
Influence of Injection Parameters and Operating Conditions on Ignition and Combustion in Dual-Fuel Engines
Marcus Grochowina,
Marcus Grochowina
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
e-mail: Grochowina@td.mw.tum.de
Technical University of Munich,
Garching 85747, Germany
e-mail: Grochowina@td.mw.tum.de
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Michael Schiffner,
Michael Schiffner
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
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Simon Tartsch,
Simon Tartsch
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
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Thomas Sattelmayer
Thomas Sattelmayer
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
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Marcus Grochowina
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
e-mail: Grochowina@td.mw.tum.de
Technical University of Munich,
Garching 85747, Germany
e-mail: Grochowina@td.mw.tum.de
Michael Schiffner
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
Simon Tartsch
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
Thomas Sattelmayer
Institute of Thermodynamics,
Technical University of Munich,
Garching 85747, Germany
Technical University of Munich,
Garching 85747, Germany
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 22, 2018; final manuscript received March 6, 2018; published online June 25, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Oct 2018, 140(10): 102809 (10 pages)
Published Online: June 25, 2018
Article history
Received:
February 22, 2018
Revised:
March 6, 2018
Citation
Grochowina, M., Schiffner, M., Tartsch, S., and Sattelmayer, T. (June 25, 2018). "Influence of Injection Parameters and Operating Conditions on Ignition and Combustion in Dual-Fuel Engines." ASME. J. Eng. Gas Turbines Power. October 2018; 140(10): 102809. https://doi.org/10.1115/1.4040089
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