振荡式喷嘴结构参数对喷雾特性的影响研究  

Research on Influences of the Structure Parameters of Oscillating Nozzle on Spray Characteristics

作　　者：吴永洪 赵文伯[1] 胡宗杰[1] 王宇锋 吴志军[1] Wu Yonghong;Zhao Wenbo;Hu Zongjie;Wang Yufeng;Wu Zhijun(Tongji University,Shanghai 201804;Jiangsu Riying Electronics Co.,Ltd.,Changzhou 213000)

机构地区：[1]同济大学,上海201804 [2]江苏日盈电子股份有限公司,常州213000

出　　处：《汽车技术》2019年第10期28-33,共6页Automobile Technology

摘　　要：自主设计流量收集装置及高速纹影试验获得某振荡式喷嘴的流量分布、喷雾锥角和振荡频率,并建立了其内外流动特性的数值仿真模型,通过与试验结果的对比验证了该模型的准确性。利用该模型研究了振荡式喷嘴的外流场特性及内流道侧壁张角对喷雾性能的影响,结果表明:喷嘴入口压力为0.2 MPa时,侧壁张角在25°~29°范围内,流量分布均呈现双峰形式,随着侧壁张角增大,射流振荡频率减小,低流量区流量占比增加且流量分布更不均匀;侧壁张角对流量大小和喷雾锥角没有影响。In this paper,the flow distribution,spray cone angle and oscillation frequency of an oscillating nozzle are obtained by self-designed flow collecting device and high-speed schlieren photography,a numerical simulation model of its internal and external flow characteristics is established and its accuracy is verified by comparison with the experimental results.Then,the effect of the external flow field characteristics and the side wall angle in the internal flow passage on the spray performance is studied with this model.The results show that the spatial distribution of the flow is in the form of a double peak at nozzle inlet pressure of 0.2 MPa,and the sidewall angle in the range of 25°~29°.As the sidewall angle increases,the jet oscillation frequency decreases,flow rate of the low flow area increases,and the flow distribution of the low flow area becomes more uneven.The change of the sidewall angle has no effect on the flow rate and cone angle.

关 键 词：振荡式喷嘴 数值仿真 外流场特性 侧壁张角 喷雾特性 

分 类 号：U463.85[机械工程—车辆工程]