Near-nozzle microscopic characterization of diesel spray under cold start conditions with split injection strategy

Ziman Wang, Yanfei Li, Chongming Wang, Hongming Xu, Miroslaw L. Wyszynski

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Near-nozzle microscopic characteristics of diesel spray under room temperature (25 °C) and low temperature (-2 °C) were investigated by microscopic imaging technique. The primary breakup of winter diesel (WD) and rapeseed methyl ester (RME) sprays were investigated with single and split injection strategies. It was shown that increased viscosity and surface tension under low temperature lead to much poorer dispersion. Under low injection pressure with split injection strategy, the first split injection was unexpectedly severely affected by both temperature and dwell, with significant breakup characteristic differences when dwell varied. By contrast, the second split under low injection pressure tended to be affected only by temperature rather by dwell. High injection pressure considerably alleviated the breakup characteristic difference of the first split injection caused by temperature and dwell although the effects of fuel properties were still seen, leading to better fuel dispersion and more predictable spray characteristics. In addition, RME with higher viscosity and surface tension consistently presented much poorer dispersion quality compared with WD even under high injection pressure where the influence of fuel properties may be insignificant.
Original languageEnglish
Pages (from-to)366-375
Number of pages10
JournalFuel
Volume181
Early online date10 May 2016
DOIs
Publication statusPublished - 1 Oct 2016

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Nozzles
Temperature
Surface tension
Esters
Viscosity
Imaging techniques

Keywords

  • Low temperature
  • Split injection strategy
  • Spray microscopic characterization

Cite this

Near-nozzle microscopic characterization of diesel spray under cold start conditions with split injection strategy. / Wang, Ziman; Li, Yanfei; Wang, Chongming; Xu, Hongming; Wyszynski, Miroslaw L.

In: Fuel, Vol. 181, 01.10.2016, p. 366-375.

Research output: Contribution to journalArticle

Wang, Ziman ; Li, Yanfei ; Wang, Chongming ; Xu, Hongming ; Wyszynski, Miroslaw L. / Near-nozzle microscopic characterization of diesel spray under cold start conditions with split injection strategy. In: Fuel. 2016 ; Vol. 181. pp. 366-375.
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abstract = "Near-nozzle microscopic characteristics of diesel spray under room temperature (25 °C) and low temperature (-2 °C) were investigated by microscopic imaging technique. The primary breakup of winter diesel (WD) and rapeseed methyl ester (RME) sprays were investigated with single and split injection strategies. It was shown that increased viscosity and surface tension under low temperature lead to much poorer dispersion. Under low injection pressure with split injection strategy, the first split injection was unexpectedly severely affected by both temperature and dwell, with significant breakup characteristic differences when dwell varied. By contrast, the second split under low injection pressure tended to be affected only by temperature rather by dwell. High injection pressure considerably alleviated the breakup characteristic difference of the first split injection caused by temperature and dwell although the effects of fuel properties were still seen, leading to better fuel dispersion and more predictable spray characteristics. In addition, RME with higher viscosity and surface tension consistently presented much poorer dispersion quality compared with WD even under high injection pressure where the influence of fuel properties may be insignificant.",
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AU - Wang, Chongming

AU - Xu, Hongming

AU - Wyszynski, Miroslaw L.

PY - 2016/10/1

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N2 - Near-nozzle microscopic characteristics of diesel spray under room temperature (25 °C) and low temperature (-2 °C) were investigated by microscopic imaging technique. The primary breakup of winter diesel (WD) and rapeseed methyl ester (RME) sprays were investigated with single and split injection strategies. It was shown that increased viscosity and surface tension under low temperature lead to much poorer dispersion. Under low injection pressure with split injection strategy, the first split injection was unexpectedly severely affected by both temperature and dwell, with significant breakup characteristic differences when dwell varied. By contrast, the second split under low injection pressure tended to be affected only by temperature rather by dwell. High injection pressure considerably alleviated the breakup characteristic difference of the first split injection caused by temperature and dwell although the effects of fuel properties were still seen, leading to better fuel dispersion and more predictable spray characteristics. In addition, RME with higher viscosity and surface tension consistently presented much poorer dispersion quality compared with WD even under high injection pressure where the influence of fuel properties may be insignificant.

AB - Near-nozzle microscopic characteristics of diesel spray under room temperature (25 °C) and low temperature (-2 °C) were investigated by microscopic imaging technique. The primary breakup of winter diesel (WD) and rapeseed methyl ester (RME) sprays were investigated with single and split injection strategies. It was shown that increased viscosity and surface tension under low temperature lead to much poorer dispersion. Under low injection pressure with split injection strategy, the first split injection was unexpectedly severely affected by both temperature and dwell, with significant breakup characteristic differences when dwell varied. By contrast, the second split under low injection pressure tended to be affected only by temperature rather by dwell. High injection pressure considerably alleviated the breakup characteristic difference of the first split injection caused by temperature and dwell although the effects of fuel properties were still seen, leading to better fuel dispersion and more predictable spray characteristics. In addition, RME with higher viscosity and surface tension consistently presented much poorer dispersion quality compared with WD even under high injection pressure where the influence of fuel properties may be insignificant.

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