TY - JOUR

T1 - Approaches for detailed investigations on transient flow and spray characteristics during high pressure fuel injection

AU - Kawaharada, Noritsune

AU - Thimm, Lennart

AU - Dageförde, Toni

AU - Gröger, Karsten

AU - Hansen, Hauke

AU - Dinkelacker, Friedrich

N1 - Funding Information: The research work for the investigations on the flow and cavitation inside nozzles is financially supported by German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the project DI 591/29-1. The research activity for the spray measurements near the nozzles is financially supported by Research Association for Combustion Engines (Forschungsvereinigung Verbrennungskraftmaschinen, FVV) within the project Methods of Spray diagnostics II (FVV IGF 18958 N). The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover. The authors would like to express our gratitude to DFG and FVV for their financial support. We also thank the project partners, M. Wensing and A. Neubauer (Univ. Erlangen-Nürnberg), the measurement collaborators, J. Wang (Argonne National Lab Chicago) and H. Ueki (Nagasaki University), and the former working group members, A. Heilig, M. Kaiser and S. Jollet for their support on this joint research work.

PY - 2020/6/26

Y1 - 2020/6/26

N2 - High pressure injection systems have essential roles in realizing highly controllable fuel injections in internal combustion engines. The primary atomization processes in the near field of the spray, and even inside the injector, determine the subsequent spray development with a considerable impact on the combustion and pollutant formation. Therefore, the processes should be understood as much as possible; for instance, to develop mathematical and numerical models. However, the experimental difficulties are extremely high, especially near the injector nozzle or inside the nozzle, due to the very small geometrical scales, the highly concentrated optical dense spray processes and the high speed and drastic transient nature of the spray. In this study, several unique and partly recently developed techniques are applied for detailed measurements on the flow inside the nozzle and the spray development very near the nozzle. As far as possible, the same three-hole injector for high pressure diesel injection is used to utilize and compare different measurement approaches. In a comprehensive section, the approach is taken to discuss the measurement results in comparison. It is possible to combine the observations within and outside the injector and to discuss the entire spray development processes for high pressure diesel sprays. This allows one to confirm theories and to provide detailed and, in parts, even quantitative data for the validation of numerical models.

AB - High pressure injection systems have essential roles in realizing highly controllable fuel injections in internal combustion engines. The primary atomization processes in the near field of the spray, and even inside the injector, determine the subsequent spray development with a considerable impact on the combustion and pollutant formation. Therefore, the processes should be understood as much as possible; for instance, to develop mathematical and numerical models. However, the experimental difficulties are extremely high, especially near the injector nozzle or inside the nozzle, due to the very small geometrical scales, the highly concentrated optical dense spray processes and the high speed and drastic transient nature of the spray. In this study, several unique and partly recently developed techniques are applied for detailed measurements on the flow inside the nozzle and the spray development very near the nozzle. As far as possible, the same three-hole injector for high pressure diesel injection is used to utilize and compare different measurement approaches. In a comprehensive section, the approach is taken to discuss the measurement results in comparison. It is possible to combine the observations within and outside the injector and to discuss the entire spray development processes for high pressure diesel sprays. This allows one to confirm theories and to provide detailed and, in parts, even quantitative data for the validation of numerical models.

KW - Atomization

KW - Cavitation

KW - Fuel injection

KW - High pressure spray development

KW - Optical diagnostics

KW - Primary spray breakup

KW - Transparent nozzle

UR - http://www.scopus.com/inward/record.url?scp=85087380280&partnerID=8YFLogxK

U2 - 10.3390/app10124410

DO - 10.3390/app10124410

M3 - Article

AN - SCOPUS:85087380280

VL - 10

JO - Applied Sciences (Switzerland)

JF - Applied Sciences (Switzerland)

SN - 2076-3417

IS - 12

M1 - 4410

ER -