非均匀流场中螺旋桨水动力及噪声特性预报研究

根据螺旋桨的型值参数,在Fluent前处理器ICEM中建立流场的网格模型,采用计算流体力学（CFD）理论,结合雷诺平均纳维-斯托克斯（RANS）方程计算了螺旋桨的水动力特性.利用滑移网格技术对非均匀来流下的螺旋桨的水动力进行大涡模拟计算,并结合FW-H噪声模块对螺旋桨的无空泡噪声进行了数值预报.流场预报结果显示,流场的非均匀性导致螺旋桨水动力系数的脉动存在一定的周期性,且整个螺旋桨的水动力系数与单个桨叶之间存在一定的倍数关系;声场结果表明,低频离散噪声远大于高频噪声,噪声衰减速度随频率增大而减小,螺旋桨轴向和径向衰减速度随着距桨盘面中心的距离增大而减小,且轴向声压级低于径向两侧.

Prediction Research on Propeller Hydrodynamic and Noise Characteristics in Non-uniform Flow

Depending on the type of propeller parameters,build the flow field mesh in ICEM,using computational fluid dynamics（CFD）theory,combined with Renault average Navier-Stokes（RANS）equations to predict the propeller hydrodynamic performance in non-uniform flow.This paper present using the sliding mesh technique to simulate the rotation of propeller,predicting the propeller hydrodynamic performance in non-uniform flow with the aid of LES,and then combine with FW-H equation to predict the non-cavitation noise characteristics.The results show that flow field of heterogeneity in the propeller hydrodynamic coefficient of pulsation has certain periodicity,and the hydrodynamic coefficients of the blade is times to a single blade.Low frequency discrete noise is greater than the high frequency acoustic,propeller axial and radial attenuation speed is inversely proportional to the frequency and distance to the center of propeller,radial and axial pressure level is lower than the sides.