旋翼螺旋桨/机翼巡航状态气动干扰规律研究

The complex aerodynamic interaction between rotor propeller and wing was studied in order to optimize the aerodynamic configuration of a tiltrotor aircraft. In our present work, considering the effects of three-dimensional finite wing and winglet, the aerodynamic interaction between rotor propeller and wing was studied by changing the length of outer wing section. The three-dimensional unsteady computational fluid dynamic method was used to obtain the flow field characteristics and aerodynamic performance of the rotor propeller and wing in cruise state. The upwash and downwash effects of the propeller slipstream on the wing and the blocking effect of the wing at the downstream of propeller slipstream were studied. The results show that with the increase of the outer wing section, the blocking effect increases, and the thrust coefficient and power coefficient increase too. The periodic fluctuation amplitude of these coefficients is 5%~6%. The obvious up and down wash of propeller slipstream effects aerodynamics performance of wing, which causes the lift coefficient and drag coefficient of the wing decrease, and the decrease of the lift coefficient is more obvious. The lift coefficient and drag coefficient both appear around 1% fluctuations. In addition, the three-dimensional flow characteristics of the finite span wing are also presented.