一种非均匀弹簧阵列支撑蒙皮结构湍流减阻特性研究

Research on Turbulent Boundary Layer Drag Reduction Characteristics of Non-Uniform Spring Array Supported Skin

摘要: 本文基于柔性壁减阻技术，设计了一种非均匀弹簧阵列支撑蒙皮结构，其由非均匀弹簧阵列和蒙皮两部分组成。首先，由Falknar-Skan方程和混合长度理论推导得到非均匀弹簧阵列支撑蒙皮结构在湍流边界层下的速度型控制方程；然后，将速度型控制方程导入Matlab进行计算，得到结构的湍流边界层速度型；最后，根据蒙皮结构的减阻效果与湍流边界层速度型变化的相关性，对结构减阻特性进行分析。结果表明，非均匀弹簧阵列支撑蒙皮结构的减阻性能优于单层蒙皮结构和均匀弹簧阵列支撑蒙皮结构。另外，减小弹簧刚度、减小蒙皮材料的阻尼和刚度可以提高结构的减阻效果。

Abstract: Based on the drag reduction technology of flexible skin, a skin structure supported by non-uniform spring array is proposed, which consists of non-uniform spring array and the skin on top. The control equation of velocity characteristic of the structure under turbulent flow is derived by using Falknar-Skan equation and mixing length theory. Control equation is then solved using Matlab, and the velocity characteristic of the structure is obtained. According to the correlation between the drag reduction effect of skin structure and the change in velocity characteristic, the drag reduction characteristics of the structure are analyzed. The results show that the proposed structure has a better drag reduction effect than simple skin structure and uniform spring array support skin structure. In addition, reducing the stiffness of the spring and the damping and stiffness of the skin material can improve the drag reduction effect of the structure.