期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 105, 期 -, 页码 342-348出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2019.04.018
关键词
High-pressure injection; Diesel spray; Nozzle internal flow; Vortex flow; X-ray imaging; Modeling
资金
- JST (Japan Science and Technology Agency, Japan)
- INHA University Research Grant [INHA-57844]
Vortex flows can be observed in many industrial systems. One of the most intricate vortex flows is the one formed in high-pressure fuel injector nozzles, which dynamics and influence on initial jet formation have been veiled due to great difficulties in observation of micro-scale fluids enclosed with steel nozzles. In this study, an X-ray tracer imaging method was used to visualize the transient fluid motion in steel micronozzles for the high-pressure diesel injection. The 1 mu m-size tungsten particles were added to the diesel so that well-contrasted X-ray images of in-nozzle flows can be recorded with high-energy polychromatic X-ray beams. The X-ray images revealed, for the first time, the transient behavior of vortex flow, vortex-type cavitation and flow separation inside the steel nozzle. The needle-lift dependence of in-nozzle vortex flow dynamics was then modeled and correlated to those observed in large-scale optical nozzles in previous studies. The results showed that the in-nozzle vortex and emerging jet flow characteristics of the practical nozzle were similar with those of large-scale nozzles, which suggested that the results of previous fundamental studies can be closely linked to practical cases.
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