偏角对螺旋桨气动性能影响的数值分析

基于滑移网格模型,通过求解三维非定常N-S方程,数值模拟了螺旋桨侧飞状态时的运动过程,仿真研究了侧偏角对螺旋桨气动性能的影响。主要结论有:由于螺旋桨轴向速度随着偏角的增大逐渐减小,所以螺旋桨轴向拉力随着偏角的增大逐渐增大,螺旋桨的侧向阻力随着偏角的增大逐渐减小。桨叶上的分离区域随着偏角的增大逐渐增大,当偏角为0°、30°、60°时,桨叶上分离涡的尺度随着桨径的增大逐渐增大,当偏角为90°时,分离涡的尺度随着桨径的增大逐渐减小。

Numerical Study on the Effect of the Yawing Angle to the Aerodynamic Characteristics of Propeller

The unsteady and vertical flow of near space screw propeller was numerical investigation based on the unsteady compressible Navier-Stokes equations with the sliding mesh technique. The effect of the yawing angle to the aerodynamic characteristics of propeller has been numerical studied. The results showed that the total thrust of the propeller in x - axis will keeps increase as yawing angle increase because the velocity in x -axis keeps decrease as yawing angle increase, the yawing resistance wilt decrease as yawing angle increase. The flow separation zoon on propeller blade will keeps increase as yawing angle increase. The flow separation vortex will increase as the radius of blade element increase when the yawing angle is 0°, 30° and 60°, but it will decrease as the radius of blade element increase when the yawing angle is 90°.