The invention relates to a bionic microstructure-based surface modification technology with a pneumatic drag reduction function, which is characterized in that the outer surface of a vehicle is modified according to a bionic surface microstructure with a preset size, and the bionic surface microstructure comprises one or more of grooves, pits, bulges and ribs; the size of the bionic surface microstructure is calculated according to the following formula: h is the height or depth of the bionic surface microstructure, theta is the air motion resistance coefficient, U is the airflow velocity, Rex is the local Reynolds number, when the plate is used for calculation, Rex is equal to Ux/theta, and x is the distance from a measuring point to the front edge of the plate. Compared with the prior art, the method has the advantages that the outer surface of the vehicle is processed and modified on the basis of a researched and developed bionic microstructure and an effective arrangement mode, the development and flowing states of a boundary layer of a near wall surface are optimized by modifying the outer surface of the vehicle, development and increase of a turbulent vortex system are inhibited, and therefore flow separation of the outer surface of the vehicle body is inhibited, and aerodynamic resistance is reduced.
本发明涉及一种具有气动减阻功能的基于仿生微结构的表面改性技术,在交通工具的外表面上按预设置尺寸的仿生表面微结构进行改性,仿生表面微结构包括沟槽、凹坑、突起、肋条中的一种或多种,仿生表面微结构的尺寸由以下公式计算得到:其中,h为仿生表面微结构的高度或深度,θ为空气运动阻力系数,U为气流速度,Rex为当地雷诺数,当以平板计算时Rex=Ux/θ,x为测量点距平板前缘的距离。与现有技术相比,本发明基于研发的仿生微结构和有效布置方式对车辆外表面进行加工改性,通过对车辆外表面改性优化了近壁面边界层发展和流动状态,抑制湍流涡系的发展和增大,从而抑制了车身外表面流动分离,减小气动阻力。
Surface modification technology with pneumatic resistance reduction function and based on bionic microstructure
一种具有气动减阻功能的基于仿生微结构的表面改性技术
21.10.2022
Patent
Elektronische Ressource
Chinesisch
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |
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