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ISSN 打印: 1044-5110

ISSN 在线: 1936-2684

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00095 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.28 SJR: 0.341 SNIP: 0.536 CiteScore™:: 1.9 H-Index: 57

Indexed in

INVESTIGATION OF RAPID ATOMIZATION AND COLLAPSE OF SUPERHEATED LIQUID FUEL SPRAY UNDER SUPERHEATED CONDITIONS

卷 26, 册 12, 2016, pp. 1361-1384
DOI: 10.1615/AtomizSpr.2016014231
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摘要

Flash boiling sprays have demonstrated great potential in improving fuel atomization and evaporation even at very low injection pressure. In this study, fuel spray characteristics of three gasoline direct-injection injectors, namely, a one-hole injector, a six-hole injector, and a one-slot injector, were investigated via high-speed Schlieren technique. Experimental results reveal that different transformations of spray geometry were identified under various test conditions. Under flare flash boiling conditions, an expanded spray structure was observed of the one-hole injector, but collapse sprays were found of the six-hole injector and one-slot injector. The spray collapse led to longer spray penetration of the six-hole injector, but for the one-slot injector, the spray penetration decreased. To unveil this phenomenon, a two-dimensional transparent nozzle was designed to investigate the inner nozzle flow using high-speed microscopic backlit imaging technique. It showed that the vapor bubble was initiated inside the nozzle along the nozzle wall under transition and flare flash boiling conditions. Both vapor bubble size and volume fraction increased with increasing superheat degrees. Much bigger vapor bubbles and larger volume fraction were found under the flare flash boiling conditions. Both in-nozzle vapor bubbles and fuel boiling effect at the nozzle exit contributed to rapid fuel atomization and evaporation process. Contraction or expansion of the spray geometry was dependent on whether in-nozzle bubble or fuel boiling played the dominant role. In summary, more physical insights were revealed into the collapse phenomena and rapid atomization process of flash boiling sprays.

对本文的引用
  1. Wu Shengqi, Xu Min, Hung David L.S., Pan Hujie, Effects of nozzle configuration on internal flow and primary jet breakup of flash boiling fuel sprays, International Journal of Heat and Mass Transfer, 110, 2017. Crossref

  2. Rachakonda Sampath K, Paydarfar Arman, Schmidt David P, Prediction of spray collapse in multi-hole gasoline direct-injection fuel injectors, International Journal of Engine Research, 20, 1, 2019. Crossref

  3. Wu Shengqi, Xu Min, Yang Shangze, Yin Peng, Contrary Effects of Nozzle Length on Spray Primary Breakup under Subcooled and Superheated Conditions, SAE Technical Paper Series, 1, 2018. Crossref

  4. Yang Shangze, Li Xuesong, Hung David L.S., Xu Min, Characteristics and correlation of nozzle internal flow and jet breakup under flash boiling conditions, International Journal of Heat and Mass Transfer, 127, 2018. Crossref

  5. Li Tianyun, Dong Xue, Hung David L.S., Li Xuesong, Xu Min, Analysis of evaporation characteristics and heat transfer for flash-boiling sprays, International Journal of Heat and Mass Transfer, 127, 2018. Crossref

  6. Yang Shangze, Li Xuesong, Hung David L.S., Arai Masataka, Xu Min, In-nozzle flash boiling flow of multi-component fuel and its effect on near-nozzle spray, Fuel, 252, 2019. Crossref

  7. Yang Shangze, Ma Zhen, Wu Shengqi, Li Xuesong, Xu Min, Dynamic characteristics of in-nozzle flash boiling bubbles and corresponding temporal responses of external spray, Experiments in Fluids, 60, 10, 2019. Crossref

  8. Wu Shengqi, Yang Shangze, Wooldridge Margaret, Xu Min, Experimental study of the spray collapse process of multi-hole gasoline fuel injection at flash boiling conditions, Fuel, 242, 2019. Crossref

  9. Rachakonda Sampath K., Paydarfar Arman, Schmidt David, Single-Hole Asymmetric GDI Injector: Influence of the Drill Angle and the Counter-Bore under Flash-Boiling and Non-Flash-Boiling Conditions, SAE International Journal of Engines, 11, 6, 2018. Crossref

  10. Yang Shangze, Li Xuesong, Hung David L.S., Xu Min, Effect of Injection Pressure on Nozzle Internal Flow and Jet Breakup under Sub-Cooled and Flash Boiling Test Conditions, SAE Technical Paper Series, 1, 2019. Crossref

  11. Yin Peng, Yang Shangze, Li Xuesong, Xu Min, Numerical simulation of in-nozzle flow characteristics under flash boiling conditions, International Journal of Multiphase Flow, 127, 2020. Crossref

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