【摘 要】
：
Flash-boiling spray has been studied extensively to demonstrate as a potential solution to many existing issues in direct injection gasoline engines with desirable spray characteristics,such as shorte
【机 构】
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School of Mechanical Engineering,Shanghai Jiao Tong University,National Engineering Laboratory of El
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Flash-boiling spray has been studied extensively to demonstrate as a potential solution to many existing issues in direct injection gasoline engines with desirable spray characteristics,such as shorter penetration,wider spray angle,smaller droplets,and quicker evaporation.However,the occurrence of the flash-boiling in a spray highly depends on the thermodynamic conditions of the liquid fuel spray and the fuel boiling point.The effects of the fuel injection pressure,fuel temperature,and ambient pressure have been studied systematically in our previous works.In this research,the effects of fuel boiling point on flash-boiling spray were investigated by blending two extreme fuels,the high boiling point fuel(n-heptane)and the low boiling point fuel(n-pentane),in various ratios.Schlieren imaging technique was employed to capture both liquid spray structure and vapor phase surrounding the spray in a constant volume chamber.Comparing the spray and its evaporation characteristics of fuels with various boiling points,it has been found that the distillation characteristics of the two-component fuels have limited influence on the occurrence of the flash-boiling and successive mixing process.Moreover,the fuel blending percentage dominates the transformation from liquid spray to flash-boiling spray as well as the breakup,atomization,and evaporation processes.For a single component fuel,fuel spray will experience flash-boiling state,transitional flash-boiling state and non-flash-boiling state with Pa/Ps increasing.However,for two-component fuel,fuel spray will only experience flash-boiling state and transitional flash-boiling state.
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