首页|ASSESSMENT OF TURBULENT COMBUSTION MODELS FOR SIMULATING PRE- CHAMBER IGNITION IN A NATURAL GAS ENGINE

ASSESSMENT OF TURBULENT COMBUSTION MODELS FOR SIMULATING PRE- CHAMBER IGNITION IN A NATURAL GAS ENGINE

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Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

Pre-chamber ignitionturbulent flame jetturbulent jet ignitionnatural gas enginescombustion model evaluation

Joohan Kim、Riccardo Scarcelli、Sibendu Som、Ashish Shah、Munidhar S. Biruduganti、Douglas E. Longman

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Argonne National Laboratory 9700 S. Cass Avenue, Lemont, IL 60439, USA

ASME Internal Combustion Engine Division Technical Conference

Chicago(US)

Proceedings of the ASME Internal Combustion Engine Division Fall Technical Conference

V001T06A012.1-V001T06A012.11

2019