2017年第2期
文章编号：10094687(2017)02003806
车辆与动力技术 Vehicle & Power Technology
入射压力和背压对柴油喷雾特性的影响
王继刚，王筱蓉，刘吉涛，王勋
（江苏科技大学机械工程学院，镇江212003）
总第146期
摘要：柴油机的燃烧特性很大程度上取决于其喷雾特性，为了深人研究高人射压力、高背压下柴油喷雾特性，建立了多组分喷雾模型，该模型在原有喷雾模型的基础上加人了多组分蒸发模型，考虑了柴油中主要组分对蒸发和喷雾的影响，并与已有的试验数据对比验证模型的可行性。结果表明，在高背压下，人射压力达到一定值后，再增加人射压力，柴油喷雾贯穿距增加很小，人射压力对案油喷雾体积和夹带空气质量影响较大；在低背压下，人射压力对柴油喷雾体积和夹带空气质量影响较小，人射压力对破碎速度影响较大，而背压对破碎速度影响很小，
关键词：柴油喷雾；喷雾特性；高人射压力；高背压；夹带空气质量
中图分类号：TK16
文献标识码：A
EffectofInjectionPressureandAmbientPressureonDiesel
Spray Characteristics
WANGXun
WANG Xiao-rong，
LIUJi-tao，
WANG Ji-gang,
(Institute of Mechanical Engineering, Jiangsu University of Science and Technology,
Zhenjiang 212003, China)
Abstract: The combustion characteristics of a diesel engine are largely determined by its spray characteristics. In order to study the spray characteristics under high injection pressure and high ambient pressure, a multi-component spray model was established with a multi-component evaporation model. The effect of main components in the fuel was taken into account on the evaporation and the spray. The feasibility of the model was verified by the existing experiment data. The results show that, under the
condition of high ambient pressure, the spray penetration inc
reaches a certain value, but the injection press
air entrainment. However, in the envire
y small when the injection pressure
great influence on both the spray volumn and the
nasag
pressure, the injection pressure has a little
nntoflowambient
entrainment.In addition, the injection pressure has a
influence on both the spray volumn
andthe
large impact on the breakup velocity, but the ambient pressure has a little effect on it. Key words: diesel spray; spray
characteristics; high injection pressure; high ambient pressure;
air entrainment
全球经济危机的阴霾挥之不去，国际油价跌岩起伏，由此引发的环境问题和能源安全间题让人堪优，在此背景下，各个国家纷纷把注意力投向减少化石能源消耗、提高柴油燃烧效率上[13]．柴油机
收稿日期：20161031
基金项目：国家自然科学基金（51306021）资助
具有能量转换效率高、能量比度高和安全系数高的特点，在未来几年将一直保持交通运输领域主导地位，在柴油机中，喷人缸内燃油的雾化特性与蒸发特性会直接影响内燃机燃烧和排放特性4]，因此
作者简介：王继刚（1991-），男，硕士，研究方向为内燃机雾化分析、液滴蒸发研究、万方数据