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Title: Progress toward understanding vortex generation in stepped-lip diesel engine combustion chambers

Abstract

Stepped-lip diesel pistons can enhance in-cylinder vortex formation and thereby improve the thermal efficiency and emissions behavior of a diesel engine. Further improvements to diesel combustion systems may be realized through improved understanding of the mechanisms by which fuel sprays interact with pistons to form vortices. Analysis of computational fluid dynamics simulations provides insight about vorticity formation in one particular region of a particular stepped-lip combustion chamber. Interactions at the boundary between the sprays and the piston surface are a source of new vorticity that is transported upward and outward. This process is believed to be the origin of an energetic vortex that has been experimentally observed in the outermost region of the combustion chamber during the mixing-controlled combustion process, and is associated with improved turbulent mixing.

Authors:
 [1];  [2]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Wisconsin Engine Research Consultants, Madison, WI (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1496493
Alternate Identifier(s):
OSTI ID: 1497633
Report Number(s):
SAND-2019-1680J
Journal ID: ISSN 2590-1230; 672612
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Published Article
Journal Name:
Results in Engineering
Additional Journal Information:
Journal Volume: 1; Journal Issue: C; Journal ID: ISSN 2590-1230
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Busch, Stephen, and Perini, Federico. Progress toward understanding vortex generation in stepped-lip diesel engine combustion chambers. United States: N. p., 2019. Web. doi:10.1016/j.rineng.2019.100004.
Busch, Stephen, & Perini, Federico. Progress toward understanding vortex generation in stepped-lip diesel engine combustion chambers. United States. doi:10.1016/j.rineng.2019.100004.
Busch, Stephen, and Perini, Federico. Wed . "Progress toward understanding vortex generation in stepped-lip diesel engine combustion chambers". United States. doi:10.1016/j.rineng.2019.100004.
@article{osti_1496493,
title = {Progress toward understanding vortex generation in stepped-lip diesel engine combustion chambers},
author = {Busch, Stephen and Perini, Federico},
abstractNote = {Stepped-lip diesel pistons can enhance in-cylinder vortex formation and thereby improve the thermal efficiency and emissions behavior of a diesel engine. Further improvements to diesel combustion systems may be realized through improved understanding of the mechanisms by which fuel sprays interact with pistons to form vortices. Analysis of computational fluid dynamics simulations provides insight about vorticity formation in one particular region of a particular stepped-lip combustion chamber. Interactions at the boundary between the sprays and the piston surface are a source of new vorticity that is transported upward and outward. This process is believed to be the origin of an energetic vortex that has been experimentally observed in the outermost region of the combustion chamber during the mixing-controlled combustion process, and is associated with improved turbulent mixing.},
doi = {10.1016/j.rineng.2019.100004},
journal = {Results in Engineering},
number = C,
volume = 1,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.rineng.2019.100004

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