中文摘要：

为获取水下螺旋桨噪声数值预报的方法,通过大涡模拟（LES）和声学无限元方法耦合,对均匀流螺旋桨进行频域噪声数值预报。通过敞水性能和桨叶表面压力分布的计算结果和试验值的对比分析,证明计算方案的准确性,进而分析了螺旋桨周围流场的脉动压力,获得特征点处各阶脉动压力幅值信息。在对螺旋桨噪声性能进行分析时,从特征点的声压频谱曲线中可以获取螺旋桨各阶叶频声压级峰值信息,且可得知总声压级大小与一阶叶频（BPF）的声压值相近。同时,由声压云图的比较分析可以看出,螺旋桨均匀流噪声主要由单极子噪声和偶极子噪声组成,单极子噪声占主要部分。该方法能够较为准确的预报均匀来流下螺旋桨的水动力噪声,为实际的工程应用提供了一套可行的预测方案。

英文摘要：

In order to get the numerical noise prediction method for an underwater propeller,a method combining the large eddy simulation（ LES） with the infinite element method（ I-FEM） was used to predict the frequency domain noise of the propeller in steady flow. The open water performance and pressure distribution on the surface of blade are calculated and compared with experimental data,which validated the accuracy of the proposed calculation scheme. Furthermore,the pulsating pressure amplitude at each feature point was derived by analyzing the pulsating pressure of flow field around the propeller,respectively. In the analysis of propeller noise,the peak information of each order blade frequency of propeller can be derived from sound pressure spectrum at feature points,and the overall sound pressure level（ SPL） is close to SPL of BPF. From the comparison of the sound pressure contours of propeller noise,it can be seen that the propeller noise in steady flow is mainly composed of monopole noise and dipole noise,among which monopole noise is the main part. This method can predict the hydrodynamic noise of propeller in uniform flow accurately,providing a feasible scheme for noise prediction in actual engineering application