浆叶的厚度和扭转对低雷诺数旋翼悬停流场的影响

Influence of Blade Thickness and Torsion on Flow Field at Low Reynolds Number for Rotor in Hover

运用嵌套网格技术研究了浆叶的厚度和扭转对低雷诺数旋翼流场的影响.对旋翼浆叶生成单块的C型贴体网格,同时针对悬停流场的基本特征,采用近似柱型的背景网格来捕捉远场尾涡,网格间流场信息的传递通过嵌套网格技术来实现.首先,通过模拟高雷诺数的悬停流场验证了方法的可行性,在此基础上,对低雷诺数旋翼浆叶在不同厚度和有无扭转时的悬停流场进行了比较分析.

The influence of blade thickness and torsion on the flow field at low Reynolds number for rotor in a hover is studied with the Chimera grid technique. A C-shaped boundary-fitted grid is generated for the blade. At the same time, a cylindrical background grid is generated to capture far wake. Taking into consideration the fundamental flow characteristic of the hovering flow, the flow field information is transferred between the two grids with the Chimera technique. Validity of the method is tested by simulation of a hovering flow field at high Reynolds number. The influence of the blade＇s thickness and torsion on the hovering flow field at low Reynolds number is then analysed.