中文摘要：

为了进一步细化汽油雾化粒径,该文基于一维振动理论研究设计了一种汽油超声喷嘴。采用有限元法分析振动模态和谐响应,获得其谐振频率、振动位移与工作应力分布,理论频率30.157kHz与HP-4286A LCR精密阻抗测试仪实测频率30.862kHz接近。此外,对超声喷嘴的汽油雾化效果进行了理论计算分析与试验研究,理论计算粒径Ф24.38μm,实测粒径Ф27.62μm,两者基本一致,比传统汽油喷油嘴的雾化粒径（约Ф50μm）缩小约2倍。研究结果有效地改善了汽油的雾化质量,提高了燃油利用率。

英文摘要：

In order to further refine the fuel atomization particle size,agasoline nozzle was designed based on the one-dimensional vibration theory.The vibration modal and harmonic responses were analyzed with the finite element method to obtain the resonant frequency and the frequency of vibration displacement and stress distribution,the theoretic frequency of 30.157 kHz was nearly equal to the measured frequency of 30.862 kHz of the HP-4286 A LCR precision impedance instrument.Furthermore,theoretical analysis and experimental research for the nozzle atomization effect of gasoline were done,theoretical calculation of particle size ofФ24.38μm were basically consistent with the measured particle size ofФ27.62μm,the size was reduced about 2times compared with the size（aboutФ50μm）of traditional gasoline injector.The results show that the device can effectively improve the atomization quality and fuel efficiency of gasoline,and provide technical reference for the design of the engine fuel injector.