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Research Papers: Internal Combustion Engines

Parameter Based Combustion Model for Large Prechamber Gas Engines

[+] Author and Article Information
Jianguo Zhu

 LEC-Large Engines Competence Center, Inffeldgasse 21A, A-8010 Graz, Austriajianguo.zhu@lec.tugraz.at

Andreas Wimmer, Eduard Schneßl, Hubert Winter, Franz Chmela

 LEC-Large Engines Competence Center, Inffeldgasse 21A, A-8010 Graz, Austria

J. Eng. Gas Turbines Power 132(8), 082806 (May 28, 2010) (6 pages) doi:10.1115/1.4000295 History: Received May 21, 2009; Revised May 26, 2009; Published May 28, 2010; Online May 28, 2010

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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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Engine cycle simulation tool with relevant input parameters

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Figure 2

Combustion system of gas engines with a gas fuelled prechamber (4)

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Figure 3

Single-cylinder research engine

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Figure 4

Typical heat release rate in the main chamber of gas engines with a gas fuelled prechamber

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Figure 5

Heat release rate simulation with double-vibe function

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Figure 6

Input and output parameters of the transfer model

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Figure 7

Test plan for the transfer model development

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Figure 8

Simulation of the main vibe parameters

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Figure 9

Simulation of the heat release rate

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Figure 10

Performance data simulation for the SCRE

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Figure 11

Performance data simulation for the FSE

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