水田驱动叶轮仿生叶片机理数值模拟分析  

Numerical Simulation on Bionic Blade of Paddy Impeller

作　　者：张永智[1,2] 左春柽[1] 孙少明[3] 李继文[2] 常青[2] 伍月红[2] 

机构地区：[1]吉林大学机械科学与工程学院 [2]吉林省农业机械试验鉴定站 [3]吉林大学地面机械仿生技术教育部重点实验室

出　　处：《农业机械学报》2008年第11期176-179,202,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金："十一五"国家科技支撑计划重大专项(项目编号:2006BAD11A08);吉林省科技发展计划资助项目(项目编号:2003334-03);吉林省农业"丰收计划"资助项目(项目编号:2002059)

摘　　要：根据水牛蹄独有的几何外形适于水田等松软地面行走和行走阻力低的特性,运用逆向工程技术提取仿生信息,并设计水田叶轮仿生叶片。通过数值模拟的方法研究仿生叶片性能改善的机理,以进一步指导叶轮的设计。仿生叶片与平面单叶片轮叶的计算机模拟对比分析表明,仿生叶片提高推进力的机理主要为:有效延缓叶片表面流体速度突变造成的流体介质冲击与分离,减小分离流对叶片的撞击阻力,提高叶轮驱动力;仿生叶片可增加叶片驱动扭矩,使叶轮驱动力增加。The particular geometric shape of the buffalo hoof is suitable for walking on the paddy-field and has low resistance during working. The bionic information of the buffalo hoof was extracted by reverse engineering technology, and then the bionic blade for paddy-field impeller was designed. To guide the design of paddy impeller, the mechanism of performance improvement of bionic blade was studied by numerical simulation. The simulation results show that the fluid medium impact and separation of blade surface fluid velocity mutation can be delayed by the bionic shape effectively. The bionic shape can reduce impact endurance test resistance of the separated flow, and improve the driving force of impeller. Moreover, the bionic blade may increase its driving torque.

关 键 词：仿生学 牛蹄 水田驱动叶轮 仿生叶片 数值模拟 

分 类 号：S220.32[农业科学—农业机械化工程] TB17[农业科学—农业工程]