The Effects of Injection Timing and Duration on Jet Penetration and Mixing in Multiple-Injection Schedules

Meghan J. Borz, Yoontak Kim, Jacqueline O'Connor

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations


Advanced injection schedules involving multiple injections have been utilized for reducing the peak cylinder pressure, phasing heat release rate, and reducing emissions in diesel engines. The timing and duration of the injections determine the injection schedule efficacy at achieving these effects. The goal of this work is to develop tools to track multiple injections to develop a better understanding of interaction mechanisms between subsequent injections. Both timing and duration effects are captured by using three different dwell times and seven injection durations. Experimental gas jet studies are conducted using schlieren. The jet-tip penetration rate, S, results do not reveal significant differences in jet-tip penetration with variations in the first-injection duration and dwell between injections. However, it was found that the jet spreading angles between the first and second injections differed, with the first injection having a higher average angle during the quasi-steady portion of the injection. This is indicative of differences in jet mixing and entrainment between the first and second injection.

Original languageEnglish (US)
JournalSAE Technical Papers
Issue numberApril
StatePublished - Apr 5 2016
EventSAE 2016 World Congress and Exhibition - Detroit, United States
Duration: Apr 12 2016Apr 14 2016

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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