螺旋桨滑流对自转旋翼气动特性影响分析

自转旋翼机在前飞时螺旋桨滑流穿过桨盘平面,为研究螺旋桨滑流对自转旋翼的非定常气动干扰,基于RANS(雷诺平均Navier-Stokes)方程,采用运动嵌套网格方法建立了适用于自转旋翼-螺旋桨气动干扰流场的计算分析方法,并对模型进行模拟。分析低速情况下,孤立状态自转旋翼和组合状态自转旋翼非定常气动特性及流场特性,研究不同速度及螺旋桨位置对自转旋翼气动特性的影响。计算结果表明螺旋桨滑流会影响自转旋翼在各方位角的升阻力特性,并引起自转旋翼尾迹在0°方位角附近发生畸变;相同升力下,来流速度越大旋翼后倾角越小,螺旋桨滑流对自转旋翼影响越小；增大螺旋桨与自转旋翼间距可以减弱螺旋桨滑流对自转旋翼的气动干扰。

Propeller Slipstream Interference with Autorotating Rotor Aerodynamic Characteristics

The propeller slipstream passed through the rotor plane when the autogyro was flying forward, in order to study the unsteady aerodynamic interference of propeller slipstream on the autorotating rotor, based on the RANS equations (Reynolds averaged Navier-Stokes), a computational analysis method for the aerodynamic interference flow field of autorotating rotor-propeller was established by using the moving overset grids method, and the model was simulated. The unsteady aerodynamic characteristics and flow field characteristics of the isolated and combined autorotating rotor at low speed were analyzed. The effects of different velocities and propeller positions on the aerodynamic characteristics of the spinning rotor were studied. The results showed that the propeller slipstream affected the lift-drag characteristics of the autorotating rotor at all azimuths, and caused the distortion of the rotor wake near 0° azimuth. Under the same rotor thrust, the larger the inflow velocity, the smaller the rotor tilt angle, and the smaller the influence of propeller slipstream on the autorotating rotor. Increasing the pitch between the propeller and the autorotating rotor can reduce the aerodynamic interference of the propeller slipstream on the rotor..