An optical investigation on spray macroscopic characteristics of ducted fuel injection

Feng Li; Chia fon Lee; Han Wu; Ziman Wang; Fushui Liu

doi:10.1016/j.expthermflusci.2019.109918

An optical investigation on spray macroscopic characteristics of ducted fuel injection

Feng Li, Chia fon Lee, Han Wu, Ziman Wang, Fushui Liu

Research output: Contribution to journal › Article › peer-review

Abstract

Ducted fuel injection (DFI) spray is a new spray method that mimics Bunsen burner and has shown a great potential to reduce soot emissions and improve thermal efficiency for heavy-duty diesel engines. But the mechanism has not been revealed clearly. The present study focuses on how the duct impacts the spray characteristics compared to free spray considering the importance of air-fuel mixing. Experiments were performed in a constant-volume spray chamber with a single-hole injector. Schlieren visualization technique was used to capture vapor-phase of sprays under different injection pressures. It was found that DFI spray is more dispersed compared to free spray. DFI spray could increase spray penetration significantly compared to free spray, especially under higher injection pressures. DFI spray could also increase spray cone angle by about 4° compared to free spray. Since diesel spray was trapped in the duct, when the spray penetrated through the duct, DFI spray area was smaller than that of free spray during initial period, but quickly exceeded that of free spray and became larger and larger. These advantages indicate DFI is able to improve the air-fuel mixing process.

Original language	English (US)
Article number	109918
Journal	Experimental Thermal and Fluid Science
Volume	109
DOIs	https://doi.org/10.1016/j.expthermflusci.2019.109918
State	Published - Dec 2019

Keywords

Air-fuel mixing
Ducted fuel injection
Free injection
Schlieren technique
Spray characteristics

ASJC Scopus subject areas

Chemical Engineering(all)
Nuclear Energy and Engineering
Aerospace Engineering
Mechanical Engineering
Fluid Flow and Transfer Processes

Online availability

10.1016/j.expthermflusci.2019.109918

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title = "An optical investigation on spray macroscopic characteristics of ducted fuel injection",

abstract = "Ducted fuel injection (DFI) spray is a new spray method that mimics Bunsen burner and has shown a great potential to reduce soot emissions and improve thermal efficiency for heavy-duty diesel engines. But the mechanism has not been revealed clearly. The present study focuses on how the duct impacts the spray characteristics compared to free spray considering the importance of air-fuel mixing. Experiments were performed in a constant-volume spray chamber with a single-hole injector. Schlieren visualization technique was used to capture vapor-phase of sprays under different injection pressures. It was found that DFI spray is more dispersed compared to free spray. DFI spray could increase spray penetration significantly compared to free spray, especially under higher injection pressures. DFI spray could also increase spray cone angle by about 4° compared to free spray. Since diesel spray was trapped in the duct, when the spray penetrated through the duct, DFI spray area was smaller than that of free spray during initial period, but quickly exceeded that of free spray and became larger and larger. These advantages indicate DFI is able to improve the air-fuel mixing process.",

keywords = "Air-fuel mixing, Ducted fuel injection, Free injection, Schlieren technique, Spray characteristics",

author = "Feng Li and Lee, {Chia fon} and Han Wu and Ziman Wang and Fushui Liu",

note = "Funding Information: This material is based upon work supported by the National Natural Science Foundation of China under Grant No. 51806014. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the National Science Foundation. Funding Information: This material is based upon work supported by the National Natural Science Foundation of China under Grant No. 51806014 . Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the National Science Foundation. Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",

year = "2019",

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doi = "10.1016/j.expthermflusci.2019.109918",

language = "English (US)",

volume = "109",

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AU - Li, Feng

AU - Lee, Chia fon

AU - Wu, Han

AU - Wang, Ziman

AU - Liu, Fushui

N1 - Funding Information: This material is based upon work supported by the National Natural Science Foundation of China under Grant No. 51806014. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the National Science Foundation. Funding Information: This material is based upon work supported by the National Natural Science Foundation of China under Grant No. 51806014 . Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the National Science Foundation. Publisher Copyright: © 2019 Elsevier Inc.

PY - 2019/12

Y1 - 2019/12

N2 - Ducted fuel injection (DFI) spray is a new spray method that mimics Bunsen burner and has shown a great potential to reduce soot emissions and improve thermal efficiency for heavy-duty diesel engines. But the mechanism has not been revealed clearly. The present study focuses on how the duct impacts the spray characteristics compared to free spray considering the importance of air-fuel mixing. Experiments were performed in a constant-volume spray chamber with a single-hole injector. Schlieren visualization technique was used to capture vapor-phase of sprays under different injection pressures. It was found that DFI spray is more dispersed compared to free spray. DFI spray could increase spray penetration significantly compared to free spray, especially under higher injection pressures. DFI spray could also increase spray cone angle by about 4° compared to free spray. Since diesel spray was trapped in the duct, when the spray penetrated through the duct, DFI spray area was smaller than that of free spray during initial period, but quickly exceeded that of free spray and became larger and larger. These advantages indicate DFI is able to improve the air-fuel mixing process.

AB - Ducted fuel injection (DFI) spray is a new spray method that mimics Bunsen burner and has shown a great potential to reduce soot emissions and improve thermal efficiency for heavy-duty diesel engines. But the mechanism has not been revealed clearly. The present study focuses on how the duct impacts the spray characteristics compared to free spray considering the importance of air-fuel mixing. Experiments were performed in a constant-volume spray chamber with a single-hole injector. Schlieren visualization technique was used to capture vapor-phase of sprays under different injection pressures. It was found that DFI spray is more dispersed compared to free spray. DFI spray could increase spray penetration significantly compared to free spray, especially under higher injection pressures. DFI spray could also increase spray cone angle by about 4° compared to free spray. Since diesel spray was trapped in the duct, when the spray penetrated through the duct, DFI spray area was smaller than that of free spray during initial period, but quickly exceeded that of free spray and became larger and larger. These advantages indicate DFI is able to improve the air-fuel mixing process.

KW - Air-fuel mixing

KW - Ducted fuel injection

KW - Free injection

KW - Schlieren technique

KW - Spray characteristics

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An optical investigation on spray macroscopic characteristics of ducted fuel injection

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