低雷诺数螺旋桨滑流对机翼气动特性的影响研究

深入研究低雷诺数滑流对机翼的影响,能够推进临近空间低速流动机理性研究,提供可靠的气动参数。参考某太阳能无人机,建立单螺旋桨计算模型,采用两叶螺旋桨,通过ICEM网格软件生成具有两个计算域的高质量结构网格,应用滑移网格边界条件,对模型进行数值模拟;分析低雷诺数螺旋桨滑流的发展和机翼在滑流作用下的非定常气动特性,研究不同螺旋桨位置对机翼气动特性的影响,计算结果表明螺旋桨滑流会很大程度地改变机翼表面压力分布和沿翼展的升力分布,对机翼升阻特性有显著影响,同时螺旋桨滑流可以抑制机翼表面层流分离泡的产生。

Low Reynolds Number Propeller Slipstream Interference with Wing Aerodynamic Characteristics

Detailed research for wing aerodynamic characteristics of propeller slipstream at Low Reynolds number could contribute the mechanism study of low speed near space flow, and provide reliable aerodynamic results. The geometric model of single propeller with two-bladed is referred to a Solar-Powered UAV. High-quality structured grid is generated by ICEM software with two computational domains. Also, the grid application compatible boundary conditions employ sliding mesh method. It analyzes the development of propeller slipstream and unsteady aerodynamic characteristics of wing at Low Reynolds number propeller slipstream. Furthermore, it compares and analyzes the wing aerodynamic characteristics at different propeller positions. The results indicate that the propeller slipstream could significant change the surface pressure of the wing and the lift distribution along wingspan. Moreover, the results show that the propeller slipstream affects wing characteristic by changing the lift and drag. Meanwhile, the laminar separation bubble might be considerable prevented by the propeller slipstream.