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Enhancing Performance and Combustion of an LPG MPI Engine for Heavy Duty Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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An LPG engine for heavy duty vehicles has been developed using liquid phase LPG injection (hereafter LPLI) system, which has regarded as as one of next generation LPG fuel supply systems.
In this work the optimized piston cavities were investigated and chosen for an LPLI engine system. While the mass production of piston cavities is considered, three piston cavities were tested: Dog-dish type, bathtub type and top-land-cut bathtub type. From the experiments the bathtub type showed the extension of lean limit while achieving the stable combustion, compared to the dog-dish type at the same injection timing.
Throughout CFD analysis, it was revealed that the extension of lean limit was due to an increase of turbulence intensity by the enlarged crevice area, and the enlargement of flame front surface owing to the shape of the bathtub piston cavity compared to that of the dog-dish type.
For the top-land-cut piston cavity, the tendency for knocking to occur was reduced due to the enlarged clearance height. However, with the bathtub cavity thermal efficiency decreased compared with the dog-dish type, due to an increase of the surface to volume ratio.
- Changup Kim - Korea Institute of Machinery and Materials
- Daeyup Lee - Korea Institute of Machinery and Materials
- Seungmook Oh - Korea Institute of Machinery and Materials
- Kernyong Kang - Korea Institute of Machinery and Materials
- Hoimyung Choi - Seoul National University
- Kyoungdoug Min - Seoul National University
CitationKim, C., Lee, D., Oh, S., Kang, K. et al., "Enhancing Performance and Combustion of an LPG MPI Engine for Heavy Duty Vehicles," SAE Technical Paper 2002-01-0449, 2002, https://doi.org/10.4271/2002-01-0449.
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