基于FLUENT的压电式无针注射器喷嘴射流分析  

Jet Analysis of Piezoelectric Needleless Syringe Nozzles Based on FLUENT

作　　者：张铁民[1] 李晟华[1] 梁莉[1] 梅园 ZHANG Tiemin;LI Shenghua;LIANG Li;MEI Yuan(Engineering Colege South China Agriculural University Guangzhou,510642,China)

机构地区：[1]华南农业大学工程学院,广州510642

出　　处：《振动．测试与诊断》2019年第2期273-280,440,441,共10页Journal of Vibration,Measurement & Diagnosis

基　　金：广东省自然科学基金资助项目(2018B030311028);广州市科技计划资助项目(201510010227)

摘　　要：为研究压电式无针注射器的喷嘴结构对其射流形态、平均喷射速度和平均湍流强度的影响,首先,基于粘性不可压缩流体纳维-斯托克斯方程,利用计算流体动力学软件Fluent的Realizable k-ε湍流模型和流场体积函数多相流模型,对四种结构的喷嘴高压自由射流进行数值模拟,结果显示,锥柱形结构的喷嘴能得到可控性较好的对称射流;其次,利用正交试验法对锥柱形结构喷嘴的锥形收缩角和中部圆柱长度进行设计仿真分析,以得到上述结构参数及其交互作用对喷嘴的平均喷射速度和平均湍流强度的影响;最后,利用SPSS软件对仿真结果进行分析。结果表明,中部圆柱长度对喷嘴的平均喷射速度和平均湍流强度具有显著影响,锥形收缩角对前者无显著影响,而对后者具有显著影响,中部圆柱长度和锥形收缩角的交互作用对前者和后者均无显著影响。综合考虑,当锥形收缩角为30°、中部圆柱长度为0.2mm时,锥柱形喷嘴可得到最佳射流特性,此时出口平均速度可达6.56m/s,湍流强度均值为1.04%。该研究可为压电式无针注射器的喷嘴设计提供参考。The effect of nozzle structure of piezoelectric needleless syringes on jet velocity,turbulence intensity and jet morphology on the nozzle cross-section are studied.First,the numerical simulations with the fluid dynamic software Fluent are carried out using the Realizable k-εturbulence model and the VOF multiphase model based on viscous incompressible fluid N-S equations.The results show that the nozzle with a cone-shaped structure can obtain a symmetrical jet with good controllability.Second,the coneshaped contraction angle and the length of the middle cylinder of the cone-shaped nozzle are simulated and analyzed to study effects of structural parameters and their interactions on jetting speed??and turbulenceintensity of the nozzle by using the orthogonal test method.Third,the results analyzed by the SPSS software show that the cylinder length has a significant impact on the average jet velocity and mean turbulence intensity of the nozzle.The cone angle has no significant effect on the former but has a significant effect on the latter.The interaction between the cylinder length and the cone angle has no significant effect on neither the former nor the latter.When the cone angle is 30(and the middle cylinder length is 0.2 mm,the cone-shaped nozzle can obtain the best jet characteristic.The mean velocity of the outlet is 6.56 m/s and the mean value of turbulence intensity is 1.04%.This study can provide a reference for nozzle design of piezoelectric needleless syringe.

关 键 词：无针注射 喷嘴 压电效应 射流 

分 类 号：TP615[自动化与计算机技术—控制理论与控制工程] TH771[自动化与计算机技术—控制科学与工程]