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    • 叶自旺，裴毅强，郭瑞涛，彭志军，秦静，许锴.汽油缸内直喷喷雾在不同壁温和二次喷射下的附壁油膜特性研究[J].内燃机工程,2020,41(3):1-8.
    Study on Characteristics of Wall Fuel Film from Gasoline Direct Injection Spray with Two-Stage Injection at Different Surface Temperatures
    DOI：10.13949/j.cnki.nrjgc.2020.03.001
    Key Words:direct injection  surface temperature  two stage injection  fuel film mass  mean thickness of fuel film
    Author NameAffiliation
    YE Ziwang，PEI Yiqiang，GUO Ruitao，PENG Zhijun，QIN Jing，XU Kai 1.State Key Laboratory of Engines，Tianjin University， Tianjin 300072， China； 2.Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China； 3.School of Mechanical Engineering, Guangxi University, Nanning 530004, China 
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    Abstract:The laser induced fluorescence(LIF) technique was used to investigate the thickness distribution of the fuel film of gasoline direct injection spray, and the variation of fuel film mass and mean fuel film thickness with different injection strategies and at different surface temperatures were studied. The results showed that fuel film at normal surface temperature was “wave-like”, while the edge of fuel film at the heated surface temperature was “stripe-like” and there were also some small droplets gathering at 413K. Keeping the total fuel injection amount constant, with the increase of the surface temperature, the fuel film mass of single injection decreased gradually, and that of two-stage injection decreased first and then increased, but the mean fuel film thickness became great with either single or two-stage injection strategy. Compared with the single injection, the mean fuel film thickness in the two-stage injection was smaller at the same heated surface temperature, and the maximum reduction was 42% at the same surface temperature of 413K. Just changing the second injection duration, with the increase of the second injection duration, the fuel film mass increased first and then decreased when the surface temperature was 298K and 373K, and the fuel film mass at the surface temperature of 413K increased gradually. Just changing the second injection duration and keeping the same second injection duration at different surface temperatures, the mean fuel film thickness at the surface temperature of 413K was the largest at each injection interval, and the mean fuel film thicknesses at the surface temperatures of 298K and 373K were subject to the injection interval.
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