Spray tip penetration of inversed-delta injection rate shaping in non-vapourising condition

M. F. E. Abdullah*, Y. Toyama, S. Saruwatari, S. Akiyama, T. Shimada, T. Aizawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The performance and emissions of diesel engine are highly depending on the fuel delivery process thus, injection rate shaping approach is expected to be crucial in the development of a highly efficient and clean modern engine. A novel rate shaping injector called TAIZAC (TAndem Injection Zapping ACtivation) is used to realise an injection rate shaping of progressive ramp-down of high initial injection pressure as in inversed-delta shape. This study aims to investigate diesel spray tip penetration behaviour in inversed-delta injection rate shaping. The experiments are conducted under a high-density non-vapourising condition in a constant volume combustion chamber. High-speed diffused back illumination DBI imaging of the diesel spray is acquired at 30,000 fps using mercury lamp as the light source. The tip penetration of the inversed-delta injection is smaller than that of rectangle injection regardless of their injection momentum which is proportional to t0.5 and t0.43 in rectangle and inversed-delta injection case, respectively. To examine the potential of inversed-delta injection on wall heat loss reduction, diesel spray flame impinges to a MEMS sensor located at 28-mm downstream. It is interesting to note that the heat flux in 200 MPa inversed-delta injection is reduced by approximately 15% compared to 200 MPa rectangle injection even though their tip penetration starts to diverge at approximately 30 mm; indicates the TAIZAC injector potential in improving engine thermal efficiency.

Original languageEnglish
Pages (from-to)7048-7060
Number of pages13
JournalInternational Journal of Automotive and Mechanical Engineering
Issue number3
Publication statusPublished - 1 Jul 2019


  • Diesel spray
  • Injection rate shaping
  • Inversed-delta
  • Tip penetration

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering


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