共轴双旋翼与单旋翼悬停流场实验测量值的对比

Comparison of Experimental Data for the Coaxial Rotor and Single Rotor Flowfield in Hovering

以三维激光多普勒测速仪测得的数据为基础，全面比较了共轴式双旋翼与单旋翼尾迹流场中轴向、径向和周向速度的特点与差异。分析指出，由于双旋翼相互间的气动干扰，导致其流场与单旋翼的明显不同，而这些不同沿各向异性，轴向最大，径向次之，周向最小。文中对周向速度表现出的异乎寻常的特点作了进一步的说明，这对建立共轴式双旋翼尾迹流场的数学模型具有重要意义。

Based on the experimental data obtained from 3 D laser Doppler velocimeter to measure the flowfield of a coaxial rotor and a single rotor in hovering their axial, radial and circumferential velocity are comparared their characteristics and differences presented. It points out that it is aerodynamic interactions between the coaxial rotors that make a great difference between the flowfield of a coaxial rotor and that of a single rotor. Especially, this paper has given further analysis of the extraordinary characteristics of the circumferential velocity. It is of much importance to construct a mathematic model of the coaxial rotor flowfield.