Challenging requirements for modern large engines regarding power output, fuel consumption, and emissions can only be achieved with carefully adapted combustion systems. With the improvement of simulation methods simulation work is playing a more and more important role for the engine development. Due to their simplicity and short computing time, one-dimensional and zero-dimensional calculation methods are widely applied for the engine cycle simulation and optimization. While the gas dynamic processes in the intake and exhaust systems can already be simulated with sufficient precision, it still represents a considerable difficulty to predict the combustion process exactly. In this contribution, an empirical combustion model for large prechamber gas engines is presented, which was evolved based on measurements on a single cylinder research engine using the design of experiment method. The combustion process in prechamber gas engines is investigated and reproduced successfully by means of a double-vibe function. The mathematical relationship between the engine operating parameters and the parameters of the double-vibe function was determined as a transfer model on the base of comprehensive measurements. The effects of engine operating parameters, e.g., boost pressure, charge temperature, ignition timing, and air/fuel ratio on the combustion process are taken into account in the transfer model. After adding modification functions, the model can be applied to gas engines operated with various gas fuels taking into account the actual air humidity. Comprehensive verifications were conducted on a single-cylinder engine as well as on full-scale engines. With the combination of the combustion model and a gas exchange simulation model the engine performance has been predicted satisfactorily. Due to the simple phenomenological structure of the model, a user-friendly model application and a short computing time is achieved.
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August 2010
Research Papers
Parameter Based Combustion Model for Large Prechamber Gas Engines
Jianguo Zhu,
e-mail: jianguo.zhu@lec.tugraz.at
Jianguo Zhu
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
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Andreas Wimmer,
Andreas Wimmer
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
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Eduard Schneßl,
Eduard Schneßl
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
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Hubert Winter,
Hubert Winter
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
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Franz Chmela
Franz Chmela
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
Search for other works by this author on:
Jianguo Zhu
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austriae-mail: jianguo.zhu@lec.tugraz.at
Andreas Wimmer
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
Eduard Schneßl
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
Hubert Winter
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, Austria
Franz Chmela
LEC-Large Engines Competence Center
, Inffeldgasse 21A, A-8010 Graz, AustriaJ. Eng. Gas Turbines Power. Aug 2010, 132(8): 082806 (6 pages)
Published Online: May 28, 2010
Article history
Received:
May 21, 2009
Revised:
May 26, 2009
Online:
May 28, 2010
Published:
May 28, 2010
Citation
Zhu, J., Wimmer, A., Schneßl, E., Winter, H., and Chmela, F. (May 28, 2010). "Parameter Based Combustion Model for Large Prechamber Gas Engines." ASME. J. Eng. Gas Turbines Power. August 2010; 132(8): 082806. https://doi.org/10.1115/1.4000295
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