摘要
基于传统的Rushton桨,开发了一种柔性叶片Rushton搅拌桨。采用数值模拟方法研究了柔性桨的功耗及层流和湍流流场特性,并分别采用扭矩测量法和粒子图像测速法进行了实验验证。结果表明,对于实验规模的搅拌容器,当介质黏度与甘油接近时,可用橡胶作为柔性桨叶制作材料。Reynolds数≤100时,柔性桨的功耗大于刚性桨;Reynolds数大于该值后,柔性桨的功耗小于刚性桨。柔性桨叶对被搅拌流体具有自适应特性,流固耦合作用下产生的变形增加了流体的径向流动能力。搅拌低黏度流体时,柔性桨能提升近桨区流体的速度,增加桨叶远端流体的循环流动能力;搅拌高黏度流体时,近桨区和桨叶远端流体的速度均大于刚性桨。就尾涡而言,柔性桨产生的涡量较小,耗能少。
Based on the traditional Rushton impeller,a flexible-blade Rushton impeller was developed.The emphasis was layed on characterization of the power and flow characteristics of this flexible-blade Rushton impeller.The power consumption as well as laminar and turbulent flow fields was numerically investigated by using the computational fluid dynamics(CFD)technique.Besides,they were experimentally validated by employing the dynamic torque sensor and particle image velocimetry(PIV),respectively.The results show that,when the viscosity of the fluid medium is close to that of glycerin,rubber can be used as the material for making flexible blade for the experimental scale stirred vessel.Power consumption of flexible-blade impeller is greater than the rigid impeller when Reynolds number is no more than 100.However,after that value,with the increase of Reynolds number,flexible-blade impeller consumes less power.The fluid-structure interaction(FSI)makes the flexible blades adaptable to the agitated fluid by deformation and accordingly,increases the radial flow capacity of the fluid.Specifically,when the viscosity fluid is low,flexible blade impeller can improve velocity of fluid near the blade and improve circulation capacity of fluid away from the impeller.When the agitated fluid has high viscosity,flexibleblade impeller can increase fluid velocity both near and far from the blade.As far as tailing vortex is concerned,flexible-blade impeller produces small magnitude vortex and is less energy consuming.
作者
杨锋苓
张翠勋
苏腾龙
YANG Fengling;ZHANG Cuixun;SU Tenglong(School of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China;Key Laboratory of High-Efficiency and Clean Mechanical Manufacture(Shandong University),Ministry of Education,Jinan 250061,Shandong,China;National Experimental Teaching Demonstration Center of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China;Shandong Tianli Energy Co.,Ltd.,Jinan 250100,Shandong,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第2期614-625,共12页
CIESC Journal
基金
山东省重点研发计划项目(2016GGX103035,2017GGX70101)。
关键词
搅拌容器
柔性Rushton搅拌桨
功耗
流场
实验验证
计算流体力学
stirred vessel
flexible-blade Rushton impeller
power consumption
flow field
experimental validation
computational fluid dynamics
