Influence of Swirl Flow on Combustion and Emissions in Spark-Ignition Experimental Engine
Publication: Journal of Energy Engineering
Volume 147, Issue 4
Abstract
This paper presents a numerical study of swirl flow effects on the combustion and emissions in single-cylinder spark ignition engine. First, a three-dimensional (3D) computational fluid dynamics (CFD) simulation was performed at two engine operating points to obtain the reference results of in-cylinder flow quantities required for the verification of a new turbulence model integrated with a cycle simulation. Then a zero-dimensional (0D) (quasi-dimensional) combustion model was used to analyze the swirl flow variations on the combustion and emissions where experimental results of 6 operating points were used to calibrate combustion and emission submodels in a cycle simulation. The coupling of the new turbulence and combustion model enabled the reconstruction of ordered in-cylinder swirl flow and the application of velocity operators on flame particles. The double swirl ratio increased the peak cylinder pressure by approximately 20%, and nitrogen oxide emissions were approximately 44% higher, while hydrocarbon (HC) emissions decreased by 44%. The twice lower swirl ratio decreased peak pressure by approximately 6%, and nitrogen oxide emissions were around 15% lower, while HC emissions were increased by 28%. If knock-limited spark advance is found for a double swirl ratio, the engine indicated that efficiency can be increased by 8.7% while HC emissions can be reduced by 20%.
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Data Availability Statement
All data, models, and code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are grateful to Mladen Božić, Ph.D., for the assistance and help in conducting the experiment in the Laboratory for IC Engines and Motor Vehicles of the Faculty of Mechanical Engineering and Naval Architecture in Zagreb, Croatia. The presented study was performed within the HrZZ project (IP-2019-04-4900) “Research on More Efficient and Environmentally Friendly Prechamber Spark Ignition Combustion” funded by the Croatian Science Foundation. This help is gratefully acknowledged.
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Information
Published In
Journal of Energy Engineering
Volume 147 • Issue 4 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 22, 2020
Accepted: Jan 21, 2021
Published online: Apr 26, 2021
Published in print: Aug 1, 2021
Discussion open until: Sep 26, 2021
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