【摘要】 通过求解薄层 Navier- Stokes方程数值模拟了悬停旋翼粘性绕流。为了方便实施旋转对称性边界条件和更为有效地捕捉尾涡系 ,采用了嵌套网格技术。空间离散方法采用中心有限体积法 ,时间推进格式为五步 Runge- Kutta法。考虑到旋翼绕流的特点 ,对远场边界条件作了合理的修正。应用本文方法对 Caradonna模型旋翼的两个实验状态进行了数值模拟 ,计算结果与实验值吻合很好 ,说明本文方法是成功的更多还原

【Abstract】 We employed Navier Stokes equations. Our main advance is the application of chimera grid technique to bring about three benefits: (1) the simulation of the viscous flow around the blade is much better; (2) the capture of wake, which is very important for a lifting rotor in hover, is a little better; (3) the implementation of periodicity condition is made simple. The grid system we used consists of two parts: (1) blade grid for the simulation of the viscous flow around the blade and for the capture of near field wake; (2) background grid for the capture of far field wake and for the implementation of periodicity condition. Figs.2 and 3 for Caradonna rotor show results of our numerical simulation to be in good agreement with test data. We emphasize that, despite the fact that our spatial discretization scheme that can be implemented by us is less refined as that used in Ref.7, our good agreement with test data is about the same as that obtained by Ref.7.更多还原