螺旋桨气动噪声数值模拟和实验研究

Numerical Simulation and Experimental Methods of Aerodynamic Noise for Propeller

针对某飞机螺旋桨开展气动噪声数值模拟和实验研究。气动噪声模拟采用非定常滑移网格方法,运用大涡模拟和FW-H模型获得声学测量点的噪声频谱。实验测量选在露天场地进行整机静态测试。通过螺旋桨各测点声压级计算结果与实验对比分析,证明了数值计算的准确性。基于计算模型和方法,分析了螺旋桨在三种转速下旋转区声压级分布规律。研究表明:旋转区声压级随转速逐渐增大;螺旋桨叶尖涡及前缘分离涡在桨叶表面形成较大压力波动,为螺旋桨主要噪声源。

This paper present the aerodynamic noise study of an aircraft propeller by experimental and numerical simulation method.Unsteady sliding mesh method is used to simulate the aerodynamic noise.Using large eddy simulation and FW-H model to obtain the noise frequency spectrum at the receiver point.The experiment was conducted in the open space for static test.Analysis and experiments by comparing the numerical results of the measuring point sound pressure level of the propeller,proved the accuracy of numerical calculation.Analysis of the three kinds of propeller speed rotation zone sound pressure distribution.The results show that the rotational zone sound pressure level with the rotational speed increases;Propeller tip vortex and leading edge vortex pressure fluctuation in the blade surface,as the main noise source of propeller.