中文摘要：

基于非结构嵌套网格方法,通过求解可压缩Euler方程对涵道螺旋桨系统的非定常流场进行了数值模拟,并研究了桨尖间隙、螺旋桨位置、涵道尾扩张角等参数的影响规律。将计算区域分为相互重叠的旋转区域和静止区域,旋转区域包含螺旋桨和旋转的桨毂,静止区域包含涵道和部分静止的桨毂,采用嵌套网格算法真实地模拟了螺旋桨和涵道之间的相对旋转运动,得到了细致的螺旋桨流场。计算值和实验测量值的对比结果相一致。参数影响研究表明,减小桨尖间隙、在一定范围内后移螺旋桨或增加尾扩张角,均可以提高涵道螺旋桨的气动性能。

英文摘要：

The unsteady flow field around a ducted-propeller configuration has been numerically simulated by solving compressible Euler equations based on unstructured overset grids, and the effects of the tip clear- ance, the propeller location and the duct diffuser included angle are investigated. The computational domain is divided into two overlapping subzones： a rotational one and a stationary one. The rotational subzone con- tains the blades and the rotating hub, while the stationary subzone contains the duct and a part of stationary hub. The method of overset grids is used to simulate the relative motion between the blades and the duct, and the detailed flow field around the propeller is obtained. The calculated results have a good agreement with the experimental data, and the results show that performance of the dueted-propeller improves while re- ducing the tip clearance or reasonably moving the propeller backwards or increasing the duet diffuser included angle.