直升机主、尾桨自由尾迹相互干扰的数值模拟

Numerical Simulation on Interaction of the Free Wake of Helicopter Main and Tail Rotor

本文给出了一种新的旋翼和尾桨干扰的数值计算方法，通过对常规直升机旋翼和尾桨自由尾迹相互干扰的数值模拟，给出干扰对旋翼和尾桨非定常气动力以及相应的非定常尾迹几何形状的影响。数值结果表明，悬停时尾桨叶面非定常压力脉动主要是由于在旋翼下洗流的诱导下，尾桨与其自身尾涡干扰引起的。随着旋翼和尾桨间距的增加，旋翼对尾桨气动特性的影响逐渐减弱。

The interaction of the helicopter main and tail rotor has been numerically simulated with the help of using a newly developed main and tail rotor interaction method.The effect of this interaction on both the section lift of the blade and the evolution of the free wake of both main and tail rotor has been studied.The numerical results show that in hover mode the unsteady surface pressure fluctuation on the tail rotor blade is due to the interaction of tail rotor blade with its own wake which is strongly influenced by the main rotor down wash flow.The effect of the interaction between main and tail rotor is gradually reduced with increasing the distance of both rotors.