每年出版 12 期
ISSN 打印: 1044-5110
ISSN 在线: 1936-2684
Indexed in
INTERNAL AND NEAR-NOZZLE FLOW OF A PRESSURE-SWIRL ATOMIZER UNDER VARIED FUEL TEMPERATURE
摘要
Gasoline fuel spray from a swirl injector collapses at high fuel temperatures due to the flash boiling effect. In order to clarify the influence of fuel temperature on the spray structure, a variety of internal and near-nozzle flows were examined at different fuel temperatures. The initial development of fuel flows was analyzed by imaging the spray behavior with high-magnification optics and by static pressure measurements of the spray field with a piezoresistive transducer. The experimental results are discussed with a mathematical liquid film model. Fuel evaporation at high fuel temperatures causes static gas pressure to increase inside and near the nozzle. The reduced viscosity of fuel at high temperature causes enhanced swirl motion of the spray. These lead to reduced liquid film thickness inside the nozzle, in addition to increased flow divergence at the nozzle exit. At locations further downstream, the spray is driven toward the spray axis at high fuel temperatures as a result of the augmented pressure drop inside the spray and entrained air. The shorter breakup time at high fuel temperatures makes the spray lose its initial momentum and be easily affected by the pressure difference between the inner and outer parts of the spray and entrained air.
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Moon Seoksu, Abo-Serie Essam, Bae Choongsik, Liquid film thickness inside the high pressure swirl injectors: Real scale measurement and evaluation of analytical equations, Experimental Thermal and Fluid Science, 34, 2, 2010. Crossref
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Fu Qing-fei, Duan Run-ze, Cui Kun-da, Yang Li-jun, Spray of gelled propellants from an impinging-jet injector under different temperatures, Aerospace Science and Technology, 39, 2014. Crossref
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Serras-Pereira J., van Romunde Z., Aleiferis P.G., Richardson D., Wallace S., Cracknell R.F., Cavitation, primary break-up and flash boiling of gasoline, iso-octane and n-pentane with a real-size optical direct-injection nozzle, Fuel, 89, 9, 2010. Crossref
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Yang Shangze, Ma Zhen, Li Xuesong, Hung David L.S., Xu Min, A review on the experimental non-intrusive investigation of fuel injector phase changing flow, Fuel, 259, 2020. Crossref
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Li Xuesong, Yang Shangze, Li Tianyun, Hung David L.S., Xu Min, Investigations on near-field atomization of flash boiling sprays for gasoline direct injection related applications, Fuel, 257, 2019. Crossref
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Chang Mengzhao, Lee Ziyoung, Park Sungwook, Park Suhan, Characteristics of flash boiling and its effects on spray behavior in gasoline direct injection injectors: A review, Fuel, 271, 2020. Crossref
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Dafsari Reza Alidoost, Lee Hyung Ju, Han Jeongsik, Lee Jeekeun, Evaluation of the atomization characteristics of aviation fuels with different viscosities using a pressure swirl atomizer, International Journal of Heat and Mass Transfer, 145, 2019. Crossref