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Title: Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization

Abstract

This work studied how in-cylinder flow structure is affected in a light-duty, swirl-supported diesel engine when equipped with three different piston geometries: the first two featuring a conventional re-entrant bowl, either with or without valve cut-outs on the piston surface and the third featuring a stepped-lip bowl. Particle image velocimetry experiments were conducted inside an optical engine to measure swirl vortex intensity and structure during the intake and compression strokes. A full computational model of the optical diesel engine was built using the FRESCO code, a recently developed object-oriented parallel computational fluid dynamics platform for engine simulations. The model was first validated against the measured swirl-plane velocity fields, and the simulation convergence for multiple cycles was assessed. Flow topology was studied by addressing bulk flow and turbulence quantities, including swirl structure, squish flux, plus geometric and operating parameters, such as the presence of valve cut-outs on the piston surface, compression ratio and engine speed. The results demonstrated that conventional re-entrant bowls have stronger flow separation at intake, hampering bowl swirl, but higher global swirl than for stepped-lip bowls thanks to a stronger and more axisymmetric squish mechanism and less tilted swirl. Stepped-lip bowls have larger inhomogeneities (tilt and axisymmetry) andmore » higher turbulence levels, but also faster turbulence dissipation toward top dead center. They have weaker squish flux but larger squish inversion momentum as a result of the smaller inertia.« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [1]
  1. Engine Research Center, University of Wisconsin–Madison, Madison, WI, USA
  2. Sandia National Laboratories, Livermore, CA, USA
  3. Ford Motor Company, Dearborn, MI, USA
  4. General Motors, Pontiac, MI, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1481307
Resource Type:
Published Article
Journal Name:
International Journal of Engine Research
Additional Journal Information:
Journal Name: International Journal of Engine Research Journal Volume: 19 Journal Issue: 10; Journal ID: ISSN 1468-0874
Publisher:
SAGE Publications
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Perini, Federico, Zha, Kan, Busch, Stephen, Kurtz, Eric, Peterson, Richard C., Warey, Alok, and Reitz, Rolf D. Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization. United Kingdom: N. p., 2017. Web. doi:10.1177/1468087417742572.
Perini, Federico, Zha, Kan, Busch, Stephen, Kurtz, Eric, Peterson, Richard C., Warey, Alok, & Reitz, Rolf D. Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization. United Kingdom. https://doi.org/10.1177/1468087417742572
Perini, Federico, Zha, Kan, Busch, Stephen, Kurtz, Eric, Peterson, Richard C., Warey, Alok, and Reitz, Rolf D. Tue . "Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization". United Kingdom. https://doi.org/10.1177/1468087417742572.
@article{osti_1481307,
title = {Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization},
author = {Perini, Federico and Zha, Kan and Busch, Stephen and Kurtz, Eric and Peterson, Richard C. and Warey, Alok and Reitz, Rolf D.},
abstractNote = {This work studied how in-cylinder flow structure is affected in a light-duty, swirl-supported diesel engine when equipped with three different piston geometries: the first two featuring a conventional re-entrant bowl, either with or without valve cut-outs on the piston surface and the third featuring a stepped-lip bowl. Particle image velocimetry experiments were conducted inside an optical engine to measure swirl vortex intensity and structure during the intake and compression strokes. A full computational model of the optical diesel engine was built using the FRESCO code, a recently developed object-oriented parallel computational fluid dynamics platform for engine simulations. The model was first validated against the measured swirl-plane velocity fields, and the simulation convergence for multiple cycles was assessed. Flow topology was studied by addressing bulk flow and turbulence quantities, including swirl structure, squish flux, plus geometric and operating parameters, such as the presence of valve cut-outs on the piston surface, compression ratio and engine speed. The results demonstrated that conventional re-entrant bowls have stronger flow separation at intake, hampering bowl swirl, but higher global swirl than for stepped-lip bowls thanks to a stronger and more axisymmetric squish mechanism and less tilted swirl. Stepped-lip bowls have larger inhomogeneities (tilt and axisymmetry) and higher turbulence levels, but also faster turbulence dissipation toward top dead center. They have weaker squish flux but larger squish inversion momentum as a result of the smaller inertia.},
doi = {10.1177/1468087417742572},
journal = {International Journal of Engine Research},
number = 10,
volume = 19,
place = {United Kingdom},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1177/1468087417742572

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Cited by: 2 works
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