基于鸮翼羽表面结构的风机叶片仿生降噪研究  

Study on Bionic Drag Reduction of Fan Blade Based on Long-Eared Owl Wing Plume Structure

作　　者：吕建民 徐成宇[1] 于洪文 

机构地区：[1]长春理工大学机电工程学院,吉林长春130022

出　　处：《机械研究与应用》2017年第6期96-99,共4页Mechanical Research & Application

摘　　要：基于对典型动物长耳鸮减阻降噪耦合功能的研究,揭示了其快速无声捕食主要取决于独有的翼羽序贯排列方式,将其结构重构于轴流风机叶片,设计了仿生非光滑轴流风机叶片。采用对比试验以及正交试验极差分析方法,研究该仿生结构对风机叶片气动噪声的影响。结果表明,仿生轴流风机的气动噪声值较低,最大降噪率为2.61%。最后重点阐述了仿生风机叶片的降噪机理,数值分析表明,非光滑叶片表面结构可降低翼型表面紊流附面层压力脉动强度,有效延缓翼型绕流场附面层分离及尾涡脱落;规则排列的条纹结构具有良好的导流作用,可降低气动噪声。Based on study of the drag and noise reduction coupling function of the typical animal long-eared owl, the fact that its silent prey mainly depends on the particular sequential arrangement of unique wing feathers is revealed. In this paper, the structure is reconstructed in the axial fan blade to design the bionic and nonsmooth axial fan blade. The influence of bionic structure on aerodynamic noise of fan blade is studied by using contrast test and orthogonal test range analysis method. The re- suits show that the aerodynamic noise of bionic axial flow fan is low, and the maximum noise reduction rate is 2.61%. Final- ly, the mechanism of bionic fan blade noise is elaborated. The numerical analysis shows that the non smooth surface of the blade structure can reduce the turbulence of airfoil surface boundary layer pressure fluctuation intensity, and effectively delay the flow around the airfoil boundary layer separation and vortex shedding; the regularly arranged stripe structure has better di- version function, and it can also reduce the aerodynamic noise.

关 键 词：工程仿生 轴流风机 翼羽 序贯排列 仿生耦合 

分 类 号：TB17[生物学—生物工程]