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Title: Assessment of impinged flame structure in high-pressure direct diesel injection

Abstract

Spray impingement often occurs during cold-start in direct-injection diesel engines, affecting the subsequent combustion process by altering the local flow condition. This work has investigated the impinged flame structure by examining local expansion distance and planar curvature of the boundary in details. The experiments were carried out in a constant volume combustion chamber. The injection pressure and ambient density were varied from 120 to 180 MPa and 14.8 to 30.0 kg/m 3 under non-vaporizing conditions, respectively. For reacting conditions, the injection pressure and ambient density were fixed at 150 MPa and 22.8 kg/m 3 but with different ambient temperatures from 800 to 1000 K. Unlike orthogonal spray impingement, the profile of expansion distance along the radial direction at the 60° impinging angle is non-uniform but the profile is comparable between the non-vaporizing and reacting conditions under the same injection pressure and ambient density. With the help of Intensity-aXial-Time method, the most intensive soot luminosity region and Mie scattering intensity region are identified and the region has been found to be along the impinged spray axial direction. Outmost boundary of an impinged flame is found to have wrinkles attributed to air entrainment. The temporal level of flame wrinkles is higher in reacting conditions than in non-vaporizingmore » conditions. The scatter distribution of the boundary curvature and near-field soot formation illustrates an inverted “S” shape correlation with time. High flame luminosity is found to be formed in concave regions while less soot is formed in convex regions. This inverted S-shape is a new finding of the state relationship at the solid–liquid–gas impinged flame propagation. Finally, heat flux measurement through the plate is examined.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Michigan Technological University, Houghton, MI, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1530466
Grant/Contract Number:  
EE0007292
Resource Type:
Published Article
Journal Name:
International Journal of Engine Research
Additional Journal Information:
Journal Name: International Journal of Engine Research; Journal ID: ISSN 1468-0874
Publisher:
SAGE Publications
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Zhao, Zhihao, Zhu, Xiucheng, Naber, Jeffrey, and Lee, Seong-Young. Assessment of impinged flame structure in high-pressure direct diesel injection. United Kingdom: N. p., 2019. Web. doi:10.1177/1468087419859788.
Zhao, Zhihao, Zhu, Xiucheng, Naber, Jeffrey, & Lee, Seong-Young. Assessment of impinged flame structure in high-pressure direct diesel injection. United Kingdom. doi:10.1177/1468087419859788.
Zhao, Zhihao, Zhu, Xiucheng, Naber, Jeffrey, and Lee, Seong-Young. Mon . "Assessment of impinged flame structure in high-pressure direct diesel injection". United Kingdom. doi:10.1177/1468087419859788.
@article{osti_1530466,
title = {Assessment of impinged flame structure in high-pressure direct diesel injection},
author = {Zhao, Zhihao and Zhu, Xiucheng and Naber, Jeffrey and Lee, Seong-Young},
abstractNote = {Spray impingement often occurs during cold-start in direct-injection diesel engines, affecting the subsequent combustion process by altering the local flow condition. This work has investigated the impinged flame structure by examining local expansion distance and planar curvature of the boundary in details. The experiments were carried out in a constant volume combustion chamber. The injection pressure and ambient density were varied from 120 to 180 MPa and 14.8 to 30.0 kg/m 3 under non-vaporizing conditions, respectively. For reacting conditions, the injection pressure and ambient density were fixed at 150 MPa and 22.8 kg/m 3 but with different ambient temperatures from 800 to 1000 K. Unlike orthogonal spray impingement, the profile of expansion distance along the radial direction at the 60° impinging angle is non-uniform but the profile is comparable between the non-vaporizing and reacting conditions under the same injection pressure and ambient density. With the help of Intensity-aXial-Time method, the most intensive soot luminosity region and Mie scattering intensity region are identified and the region has been found to be along the impinged spray axial direction. Outmost boundary of an impinged flame is found to have wrinkles attributed to air entrainment. The temporal level of flame wrinkles is higher in reacting conditions than in non-vaporizing conditions. The scatter distribution of the boundary curvature and near-field soot formation illustrates an inverted “S” shape correlation with time. High flame luminosity is found to be formed in concave regions while less soot is formed in convex regions. This inverted S-shape is a new finding of the state relationship at the solid–liquid–gas impinged flame propagation. Finally, heat flux measurement through the plate is examined.},
doi = {10.1177/1468087419859788},
journal = {International Journal of Engine Research},
number = ,
volume = ,
place = {United Kingdom},
year = {2019},
month = {7}
}

Journal Article:
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This content will become publicly available on July 1, 2020
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