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8404356 
Journal Article 
高背压闪急沸腾条件下GDI喷油器喷雾特性的试验 
Zhan, C; Tang, Z; Zhang, J; Li, Y; Shuai, S 
2020 
Chinese Society for Internal Combustion Engines 
38 
6 
490-496 
Chinese 
The spray characteristics of a five-hole direct injector under high ambient-pressure flash-boiling conditions were studied in a constant volume combustion vessel by means of high speed imaging measurement. n-hexane was used as the test fuel with temperature from 130℃ to 220℃ and ambient-pressure from 0.08 MPa to 0.90 MPa. The results show that, at the sub-atmospheric pressures, the individual jets move towards the axis of the injector and merge into one single jet, causing the spray collapse. In contrast, under elevated ambient-pressure flashboiling conditions, the jets are separated from each other and the spray collapse is mitigated. The spray width gradually widens with the increase of fuel temperature and this could be attributed to the massive production of vapor via surface boiling and the counteraction of the low-pressure tendency induced by the high-speed jets. It is further confirmed that the low-pressure area caused by the high-speed jet could not fully explain the spray collapse in the low ambient-pressure flash-boiling environment. Additionally, it is found that there should be an ambientpressure threshold between 0.1MPa and 0.3MPa. Below the threshold value, the spray width decreases with the increase of ambient-pressure. However, beyond the threshold value, an opposite trend is observed. © 2020, Editorial Office of the Transaction of CSICE. All right reserved. 
Flash-boiling; Gasoline direct injection(GDI) injector; High ambient-pressure; Spray collapse