Investigation of Performance and Emission Characteristics on a Large-Bore Spark-Ignition Natural Gas Engine with Scavenged Prechamber and Miller Cycle Attribute

2017 ◽  
Vol 143 (5) ◽  
pp. 04017026 ◽  
Author(s):  
Qiang Zhang ◽  
Kai Xian ◽  
Menghan Li
Keyword(s):  
Natural Gas ◽  
Spark Ignition ◽  
Emission Characteristics ◽  
Miller Cycle ◽  
Gas Engine ◽  
Performance And Emission ◽  
Natural Gas Engine

The influences of hydrogen on the performance and emission characteristics of a heavy duty natural gas engine

2011 ◽  
Vol 36 (5) ◽  
pp. 3739-3745 ◽  
Author(s):  
Cheolwoong Park ◽  
Changgi Kim ◽  
Young Choi ◽  
Sangyeon Won ◽  
Yasuo Moriyoshi
Keyword(s):  
Natural Gas ◽  
Emission Characteristics ◽  
Heavy Duty ◽  
Gas Engine ◽  
Performance And Emission ◽  
Natural Gas Engine

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2021 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract 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.

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