旋翼螺旋桨/机翼巡航状态气动干扰规律研究

Aerodynamic Interaction Between Rotor Propeller and Wing in Cruise State

关键词:  旋翼螺旋桨  计算流体力学  气动干扰  有限翼展机翼  数值模拟

Key words:  Rotor propeller  Computational fluid dynamics  Aerodynamic interaction  Finite span wing  Numerical simulation

摘要:

为优化倾转旋翼机气动布局，研究旋翼螺旋桨与机翼间复杂的气动干扰，在考虑有限翼展三维效应、翼尖小翼情况下，通过改变机翼外翼段的长度，研究了旋翼螺旋桨与机翼间的气动干扰规律。使用计算流体力学的三维非定常计算方法获得了巡航状态下旋翼螺旋桨与机翼的流场特征及气动特性参数，研究了螺旋桨滑流对机翼的上洗、下洗作用，以及机翼对螺旋桨滑流的阻塞作用。计算结果表明，随着机翼外翼段的增长，阻塞作用加大，螺旋桨的拉力系数、功率系数均有增大，并且存在周期性波动，波动幅值在5%~6%；机翼受螺旋桨滑流上、下洗作用，其升力系数和阻力系数都减小，但升力系数减小更为明显，升力系数和阻力系数都出现了1%左右的波动。计算同时也反映了有限翼展的三维流动特点。

Abstract:

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.