悬停旋翼的自由尾迹计算

Calculation on Free Wake Geometryfor Helicopter Rotors in Hover

在随桨叶旋转的坐标系中，建立了悬停旋翼自由尾迹计算的迭代方法和模型。文中以两种不同的模型旋翼为算例，对叶尖涡的轴向和径向位置进行了计算，并与已有的试验结果进行了对比，检验了模型的可靠性。运用上述自由尾迹模型，分别研究了不同叶尖马赫数、桨距角和桨叶片数时悬停尾迹形状的变化，表明了旋翼参数对自由尾迹形状的影响。最后，文末给出了一些结论。

In the coordinate system rotating with the blade, a free wake model for hovering rotors using an iterative procedure and the curved vortex element on the circular arc is established and checked by the comparisons with experimental data on the tip vortex path and blade bound circulation for two different model rotors. Based on the wake model, the interaction between the tip vortex and the following blade is analyzed, and the influence on rotor parameters, such as the tip Mach number, the blade pitch and the number of blade, on the radial and axial geometries of the tip vortex is calculated and discussed. Finally, some conclusions are given.