低频超声二次雾化喷头声悬浮过程仿真  

Simulation of low frequency ultrasonic dual-atomization nozzle′s levitation process

作　　者：高建民[1,2] 李扬波[1] 

机构地区：[1]江苏大学现代农业装备与技术省部共建教育部重点实验室/江苏省重点实验室,江苏镇江212013 [2]美国农业部农业工程应用技术国家实验室,美国俄亥俄州44691

出　　处：《排灌机械工程学报》2011年第1期50-53,共4页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省自然科学基金资助项目(BK2007090);江苏省'青蓝工程'项目

摘　　要：为研究声悬浮的悬浮机理,以对喷头二次雾化提供理论依据,进行设计指导,采用有限元数值分析的方法,建立了整个声悬浮系统的三维有限元模型;喷头的端面振动频率为28 kHz,振幅为5μm;在声固耦合有限元理论的基础上,利用显式动力学软件LS-DYNA对其进行了求解;对金属球在悬浮过程中的运动状态进行了分析,得到了金属球质心上下运动随时间的位移、速度、加速度曲线图和金属球绕质心转动的角速度、角加速度图.计算结果表明:当低频超声二次雾化喷头振动时,喷头周围的声场分布很不均匀;喷头振动产生的声场辐射力能够将金属球悬浮起来做上下运动,并且金属球在上下运动的同时还发生了绕质心的旋转;通过仿真计算获得了悬浮球在悬浮过程中的各动力学参数,为喷头的设计提供了参考数据.Researching the levitation to provide a theoretical basis for the second atomization and design guidelines, the finite element method was used, the 3D finite element model of the whole ultrasonic levitation system was built; the nozzle＇s vibration frequency was 28 kHz,and its amplitude is 5 μm. Based on ultrasonic-structural coupled theory, the solution was carried out by the explicit dynamics software LS- DYNA; the motion states of the metal ball in the suspension was analyzed; obtaining the displacement, velocity, acceleration of the up and down movement and the angular velocity and angular acceleration. The results of numerical simulation show that the sound field is unstable when the low-frequency ultrasonic nozzle is vibrating; the acoustic radiation force generated by nozzle vibrates can suspend the metal ball to move up and down, and during the up and down movement, the metal ball also had a rotation around its eentroid. The dynamics parameters of the ball suspended in the air are obtained through simulation compute, help to design the nozzle.

关 键 词：声悬浮 超声雾化 有限元仿真 声固耦合 数值分析 

分 类 号：S277.9[农业科学—农业水土工程] TB559[农业科学—农业工程]