周昕毅，李铁，王宁.柴油蒸发喷雾瞬态液相贯穿距模型及试验验证[J].内燃机工程,2020,41(2):8-14.
柴油蒸发喷雾瞬态液相贯穿距模型及试验验证
Modeling and Experimental Verification of Transient Liquid Penetration of Diesel Evaporating Spray
DOI：10.13949/j.cnki.nrjgc.2020.02.002
关键词:柴油机  蒸发喷雾  液相贯穿距模型  喷射初期  定容燃烧弹
Key Words:diesel engine  evaporating spray  liquid penetration model  initial stage of injection  constant volume combustion vessel
基金项目:国家自然科学基金项目(51776125)
作者单位
周昕毅，李铁，王宁 1.上海交通大学 海洋工程国家重点实验室，上海 200240； 2.高新船舶与深海开发装备协同创新中心，上海 200240 
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摘要:考虑喷射初期喷嘴压力室内部压力建立过程，推导了适用于喷射初期的液相贯穿距模型。随后在定容燃烧弹内营造柴油机上止点附近高温高压氛围条件，采用背景光散射法试验研究了喷射压力、环境温度及环境密度对蒸发喷雾液相贯穿距发展历程的影响，并将试验结果与模型进行对比。模型与试验结果表明：在喷射初期，液相贯穿距并非按照Hiroyasu模型预测的随时间t线性变化，而表现出一个加速过程，与t1.5成正比；随后由于喷雾破碎和喷嘴压力室内部建压完成，液相贯穿距与t0.75和t0.5成正比。
Abstract:Considering the fuel pressure building process inside the nozzle sac, a model suitable for the liquid penetration at the initial stage of fuel injection was derived. Then, in the high-temperature and high-pressure environment near the top dead center of a diesel engine built in a constant volume combustion vessel, the effects of the injection pressure, ambient temperature and density on the development process of evaporating spray liquid penetration were tested by using diffused back-illumination method, and compared with the simulation calculation. Results show that at the initial stage of fuel injection, the liquid penetration does not change linearly with the time of t as predicted by Hiroyasu model, but first presents an acceleration process that varies with the time of t1.5 and then changes with the time of t0.75 and t0.5, respectively, due to the spray breakage and fuel pressure built up in the nozzle sac.
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