空气中非光滑凸包面减阻性能的数值仿真研究

Numerical Simulation and Drag Reduction Performance Analysis of Non-Smooth Surfaces with Convex Domes in Air

在表面减阻性能的研究中,凸包面减阻技术源于仿生动物表面的微观结构,可以运用到大型飞机表面减阻问题具有重要研究价值。问题在于微观结构形状尺寸、不同介质、不同来流速度等多种因素与减阻效果有关。为研究凸包面在空气介质中速度对减阻能力的影响,采用数值仿真和理论分析的研究方法,对凸包面在空气中速度1m/s^10m/s范围内的流场用Fluent6.3软件进行数值仿真计算。选用了N-S方程,RNGK-ε湍流模型,仿真结果表明,研究的模型在来流速度6m/s时减阻效果明显,总减阻率为24.512%。数值模拟数据与理论计算数据进行比较,保证结果值的可靠性,分析发现凸包单元使凸包附近流场发生改变,凸包面具有较好减阻能力,并优化得到较好减阻方案。

Non - smooth surface drag reduction technology derived from bionic microstructure of animal surface can be applied to large aircraft. However, the development of this technology is relatively slow. The microscopic structure of the shape and size of different medium, different stream velocity and other factors are related to the drag reduction effect of non - smooth Surfaces with Convex Domes. To analyze the non - smooth surfaces with convex domes in air medium flow of the drag reduction effect and performance, the non - smooth surfaces with convex domes in air flow velocity from lm/s to10m/s was numerically computed and simulated using FLUENT6. 3 software. The numerical simulation and theoretical analysis method was used. The results show that the drag reduction rate of the optimal drag reduction model can reach 24. 512% when the flow velocity is 6m/s. After analysis, it is found that the convex hull unit changes the flow field near the convex dome. The Convex Domes has better drag reduction ability on non - smooth Surfaces. Finally, a better drag reduction model was obtained by calculation. Drag reduction effects of the model are different in different speeds.