重型柴油机低温环境喷雾及蒸发特性研究  

Spray and Evaporation Characteristics of Heavy-Duty Diesel Engines at Low Temperatures

作　　者：石智成 吴晗[1] 李海鹰 刘福水[1] SHI Zhicheng;WU Han;LI Haiying;LIU Fushui(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]中国北方发动机研究所,天津300400

出　　处：《内燃机工程》2020年第5期1-8,共8页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51806014)。

摘　　要：利用定容燃烧弹结合米散射法、阴影法针对喷孔直径(0.12~0.32 mm)和环境温度(550~850 K)对重型柴油机低温环境下喷雾特性的影响进行可视化测量。结果表明:不同于轻型柴油机,在各个喷射压力和环境压力下提高环境温度到750 K时,表征重型柴油机的0.32 mm喷孔下的液相燃油依然持续贯穿,无法达到准稳态或达到准稳态时贯穿距离过长而湿壁。随着环境温度增加,0.32 mm喷孔下的液相燃油湿壁量减小。只有环境温度增长到850 K时,燃油的蒸发作用足够强烈,液相撞壁喷雾的横向扩展长度和浮起高度才能均达到准稳态。The effects of nozzle diameter(0.12~0.32 mm)and ambient temperature(550~850 K)on the spray characteristics of heavy-duty diesel engines were measured visually in a constant volume combustion chamber using the Mie-scattering and shadowgraph methods.The results showed that,different from the light-duty diesel engines,the liquid-phase fuel of the heavy-duty diesel engines with the 0.32 mm nozzle still penetrated continuously and failed to reach a quasi-steady state when the ambient temperature was increased to 750 K at various injection pressures and ambient pressures,or when reaching a quasi-steady state,the penetration distance was too long,leading to spray impingement.With the increase of the ambient temperature,the adhesion amount of liquid spray with the 0.32 mm nozzle decreased.Only when the evaporation of fuel was strong enough at the ambient temperature of 850 K,could the height and radius of impingement spray reach a quasi-steady state.

关 键 词：重型柴油机 低温 喷孔直径 环境温度 喷雾 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]