【作者】

周昕毅，李铁，王宁

【摘要】

中文摘要: 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。 英文摘要: 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.

【论文集名称】

2020年

【会议名称】

《内燃机工程》

【下载次数】

1

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