Design of piston bowl geometry for better combustion in direct-injection compression ignition engine

The current computational fluid dynamics (CFD) study presents the effect of piston bowl geometry on the performance and emissions of a direct-injection diesel engine. Different piston bowl profiles, namely, hemispherical combustion chamber (HCC), shallow depth combustion chamber (SCC) and toroidal c...

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Bibliographic Details
Published in:	Sadhana (Bangalore) Vol. 43; no. 6; pp. 1 - 9
Main Authors:	GANJI, PRABHAKARA RAO, SINGH, RUDRA NATH, RAJU, V R K, SRINIVASA RAO, S
Format:	Journal Article
Language:	English
Published:	New Delhi Springer India 01-06-2018 Springer Nature B.V
Subjects:	Aerodynamics Combustion chambers Compression ratio Computational fluid dynamics Cylinders Diesel engines Engineering Geometry Mathematical models Numerical analysis Spontaneous combustion piston bowl geometry CI engine combustion emissions
Online Access:	Get full text
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Summary:	The current computational fluid dynamics (CFD) study presents the effect of piston bowl geometry on the performance and emissions of a direct-injection diesel engine. Different piston bowl profiles, namely, hemispherical combustion chamber (HCC), shallow depth combustion chamber (SCC) and toroidal combustion chamber (TCC), have been created with a baseline compression ratio of 17.5. CONVERGE TM CFD code coupled with the SAGE combustion model was used for numerical analysis. It is observed that the TCC piston bowl geometry renders better air–fuel mixture inside the cylinder, which leads to a homogeneous charge. Further, numerical experiments are carried out to analyze suitable TCC piston bowl geometry by varying the depth of the bowl. Out of all the cases, the case with 1.26 mm decrease in depth of bowl from the baseline (TCC) design gives better emissions and performance characteristics.
ISSN:	0256-2499 0973-7677
DOI:	10.1007/s12046-018-0907-x