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Title: Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation

Abstract

In this work we have studied cycle-to-cycle variation (CCV) in a spark-ignited (SI) engine using large-eddy simulation (LES) in conjunction with the G-equation combustion model. A single cylinder of a four-cylinder port-fueled SI engine was simulated. 49 consecutive full cycles were computed. The operating condition studied in this work is stoichiometric and stable, and represents a load of 16 bar brake mean effective pressure (BMEP), and an engine speed of 2500 revolutions per minute (r/min). The CFD simulation shows good agreement in terms of in-cylinder pressure prediction with respect to the experiments, and is also able to capture the range of CCV observed in experiments. Further, neither the simulation, nor the experiments show any distinguishable pattern in the sequence of high and low cycles. We numerically decoupled the effects of variations in equivalence ratio fields and velocity fields to isolate the effects of differences in the velocity field and differences in the equivalence ratio field on flame development and propagation. Based on this study we inferred that for this engine, under the operating conditions studied, the differences in burn rates can be attributed to the differences in the velocity flow-field in the region around the spark gap during ignition. Wemore » then performed an analysis to identify the correlation between peak cylinder pressure (PCP) and flame topologies over all the simulated cycles. We found that high cycles (higher PCP values) are strongly correlated to flatter flame volume shapes (flattened in the piston-to-head direction), and volumes that are more symmetric about the ignition axis. In addition, these kinds of flame volumes were found to correlate well with lower values of prior-to-ignition velocity going from the intake to the exhaust side (mean flow caused by tumble) at the spark, and also higher values of prior-to-ignition velocity in the piston-to-head direction.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [3];  [1]
  1. Center for Transportation Research, Argonne National Laboratory, Argonne, IL, USA
  2. Gamma Technologies LLC, Westmont, IL, USA
  3. Politecnico di Torino, Turin, Italy
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology
OSTI Identifier:
1487206
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
International Journal of Engine Research
Additional Journal Information:
Journal Volume: 19; Journal Issue: 8; Journal ID: ISSN 1468-0874
Publisher:
SAGE
Country of Publication:
United States
Language:
English
Subject:
CCV; CFD; Gasoline; Internal Combustion Engine; LES; Spark Ignition

Citation Formats

Zhao, Le, Moiz, Ahmed Abdul, Som, Sibendu, Fogla, Navin, Bybee, Michael, Wahiduzzaman, Syed, Mirzaeian, Mohsen, Millo, Federico, and Kodavasal, Janardhan. Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation. United States: N. p., 2017. Web. doi:10.1177/1468087417732447.
Zhao, Le, Moiz, Ahmed Abdul, Som, Sibendu, Fogla, Navin, Bybee, Michael, Wahiduzzaman, Syed, Mirzaeian, Mohsen, Millo, Federico, & Kodavasal, Janardhan. Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation. United States. doi:10.1177/1468087417732447.
Zhao, Le, Moiz, Ahmed Abdul, Som, Sibendu, Fogla, Navin, Bybee, Michael, Wahiduzzaman, Syed, Mirzaeian, Mohsen, Millo, Federico, and Kodavasal, Janardhan. Wed . "Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation". United States. doi:10.1177/1468087417732447.
@article{osti_1487206,
title = {Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation},
author = {Zhao, Le and Moiz, Ahmed Abdul and Som, Sibendu and Fogla, Navin and Bybee, Michael and Wahiduzzaman, Syed and Mirzaeian, Mohsen and Millo, Federico and Kodavasal, Janardhan},
abstractNote = {In this work we have studied cycle-to-cycle variation (CCV) in a spark-ignited (SI) engine using large-eddy simulation (LES) in conjunction with the G-equation combustion model. A single cylinder of a four-cylinder port-fueled SI engine was simulated. 49 consecutive full cycles were computed. The operating condition studied in this work is stoichiometric and stable, and represents a load of 16 bar brake mean effective pressure (BMEP), and an engine speed of 2500 revolutions per minute (r/min). The CFD simulation shows good agreement in terms of in-cylinder pressure prediction with respect to the experiments, and is also able to capture the range of CCV observed in experiments. Further, neither the simulation, nor the experiments show any distinguishable pattern in the sequence of high and low cycles. We numerically decoupled the effects of variations in equivalence ratio fields and velocity fields to isolate the effects of differences in the velocity field and differences in the equivalence ratio field on flame development and propagation. Based on this study we inferred that for this engine, under the operating conditions studied, the differences in burn rates can be attributed to the differences in the velocity flow-field in the region around the spark gap during ignition. We then performed an analysis to identify the correlation between peak cylinder pressure (PCP) and flame topologies over all the simulated cycles. We found that high cycles (higher PCP values) are strongly correlated to flatter flame volume shapes (flattened in the piston-to-head direction), and volumes that are more symmetric about the ignition axis. In addition, these kinds of flame volumes were found to correlate well with lower values of prior-to-ignition velocity going from the intake to the exhaust side (mean flow caused by tumble) at the spark, and also higher values of prior-to-ignition velocity in the piston-to-head direction.},
doi = {10.1177/1468087417732447},
journal = {International Journal of Engine Research},
issn = {1468-0874},
number = 8,
volume = 19,
place = {United States},
year = {2017},
month = {9}
}

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