侧风状态下剪刀型尾桨的气动噪声特性

Aerodynamic Noise Characteristics of Scissor Tail Rotor under Crosswind Condition

剪刀型尾桨在某些工况下能够降低直升机气动噪声。以L型剪刀型尾桨为研究对象,采用滑移网格方法实现了尾桨的旋转运动,运用计算流体力学方法对尾桨流场进行计算,并使用FW-H方法对尾桨气动噪声进行计算模拟。研究了侧风状态时不同交叠角与不同轴向间距下的剪刀式尾桨的气动力和气动噪声,分析了交叠角和轴向间距对尾桨气动力与气动噪声的影响。

The scissor tail rotors can reduce the helicopter aerodynamic noise in some working conditions.The L-configuration scissor tail rotor taken as the research object,the rotation motion of the tail rotor is realized by using the sliding grid method.The flow field of the tail rotor is calculated by using the computational fluid dynamics method,and FW-H method is used to calculate and simulate the aerodynamic noise of tail rotor.The aerodynamic force and aerodynamic noise of the scissor tail rotors with different overlapping angles and different axial spacing in the crosswind state are studied.The effects of overlapping angle and axial spacing on the aerodynamic force and aerodynamic noise of the tail rotor are analyzed.