Numerical and Experimental Studies of a Novel Dimpled Stepped-Lip Piston Design on Turbulent Flow Development in a Medium-Duty Diesel Engine Article Swipe
Angela Wu
,
Stephen Busch
,
Federico Perini
,
Seokwon Cho
,
Darío López Pintor
,
Rolf D. Reitz
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.4271/2022-01-0400
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.4271/2022-01-0400
Spray-wall interactions in diesel engines have a strong influence on turbulent flow evolution and mixing, which influences the engine’s thermal efficiency and pollutant-emissions behavior. Previous optical experiments and numerical investigations of a stepped-lip diesel piston bowl focused on how spray-wall interactions influence the formation of squish-region vortices and their sensitivity to injection timing. Such vortices are stronger and longer-lived at retarded injection timings and are correlated with faster late-cycle heat release and soot reductions, but are weaker and shorter-lived as injection timing is advanced. Computational fluid dynamics (CFD) simulations predict that piston bowls with more space in the squish region can enhance the strength of these vortices at near-TDC injection timings, which is hypothesized to further improve peak thermal efficiency and reduce emissions. The dimpled stepped-lip (DSL) piston is such a design.In this study, the in-cylinder flow is simulated with a DSL piston to investigate the effects of dimple geometry parameters on squish-region vortex formation via a design sensitivity study. The rotational energy and size of the squish-region vortices are quantified. The results suggest that the DSL piston is capable of enhancing vortex formation compared to the stepped-lip piston at near-TDC injection timings. The sensitivity study led to the design of an improved DSL bowl with shallower, narrower, and steeper-curved dimples that are further out into the squish region, which enhances predicted vortex formation with 27% larger and 44% more rotationally energetic vortices compared to the baseline DSL bowl. Engine experiments with the baseline DSL piston demonstrate that it can reduce combustion duration and improve thermal efficiency by as much as 1.4% with main injection timings near TDC, due to improved rotational energy, but with 69% increased soot emissions and no penalty in NOx emissions.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.4271/2022-01-0400
- OA Status
- green
- Cited By
- 16
- References
- 39
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4220971541
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4220971541Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.4271/2022-01-0400Digital Object Identifier
- Title
-
Numerical and Experimental Studies of a Novel Dimpled Stepped-Lip Piston Design on Turbulent Flow Development in a Medium-Duty Diesel EngineWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2022Year of publication
- Publication date
-
2022-03-29Full publication date if available
- Authors
-
Angela Wu, Stephen Busch, Federico Perini, Seokwon Cho, Darío López Pintor, Rolf D. ReitzList of authors in order
- Landing page
-
https://doi.org/10.4271/2022-01-0400Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
- OA URL
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https://www.osti.gov/biblio/1894434Direct OA link when available
- Concepts
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Piston (optics), Diesel engine, Turbulence, Flow (mathematics), Automotive engineering, Materials science, Diesel fuel, Computer science, Mechanical engineering, Mechanics, Engineering, Physics, Optics, WavefrontTop concepts (fields/topics) attached by OpenAlex
- Cited by
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16Total citation count in OpenAlex
- Citations by year (recent)
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2025: 5, 2024: 4, 2023: 5, 2022: 2Per-year citation counts (last 5 years)
- References (count)
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39Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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