喷油嘴喷孔结构参数对雾化特性的影响研究  

Influence of nozzle structure parameters on atomization characteristics

作　　者：岳义帅 陈国金[1] 陈昌[1] 孙海龙 朱凌俊[1] 余芳 YUE YI-shuai;CHEN Guo-jin;CHEN Chang(School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018 [2]博世电动工具〈中国〉有限公司研发部,浙江杭州310052

出　　处：《能源工程》2019年第4期1-8,共8页Energy Engineering

基　　金：国家自然科学基金资助项目(51675148,51405117)

摘　　要：采用VOF计算模型对喷嘴内部流动进行数值模拟,分析喷孔直径、喷孔入口处倒角等结构参数以及背压对雾化特性的影响。结果表明:喷孔直径增大,喷孔内负压区所占体积增大,气穴强度相应减弱,喷孔的流量系数相对减小,燃油的喷射速度随之降低,但其油束射程却随之变大;喷孔入口处倒角增大,喷孔内负压区所占体积减小,气穴强度相对减弱,但燃油的喷射速度均匀性提高,喷孔的流量系数增大,燃油的平均喷射速度增大,燃油的油束射程也将变大;背压增大,喷孔内压力随之增大,但背压对雾化特性的影响较小。VOF model was used to analyze the influence of diameter, inlet chamfering of orifice and back-pressure on spray characteristics. The results showed that the size of the negative pressure zone increased with the increase of the orifice diameter, the intensity of cavitation weakens, the flow coefficient decreased, the jet velocity of diesel reduced but the range of diesel spray increased. With the increase of the inlet chamfering of orifice, the size of the negative pressure zone decreased, the intensity of cavitation weakened, but the jet velocity of diesel increased equably, the flow coefficient, the jet average velocity of diesel and the range of diesel spray increased. With the increase of the back-pressure, pressure increased in the orifice, but the influence of back-pressure to spray characteristics was weaker.

关 键 词：喷油嘴结构 雾化特性 数值模拟 负压区 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]