Numerical simulation parameters summary.

This study provides a comprehensive analysis of the INSEAN E-779A four-bladed marine propeller, addressing both hydrodynamic and hydroacoustic aspects. Employing unsteady Reynolds-Averaged Navier-Stokes (RANS) simulations with the k-ω SST turbulence model for hydrodynamics and the Ffowcs Williams-Hawking acoustic analogy for acoustics. A wide range of operational conditions are examined by varying the advance ratio from 0.6 to 0.9 and flow incidence angle from 0 to 40 degrees. Computation of hydrodynamic coefficients across spatial directions provides insight into loading impacts on performance. Significant efficiency reductions are observed, such as a decrease from 64% to 28% at 40 degrees for an advance ratio of 0.88. Directional acoustic pressure distributions reveal notable variance, including a 19–31% change when reducing the advance ratio to 0.6 at 40 degrees incidence. Fast Fourier Transform (FFT) analysis of acoustic signals highlights dominant frequencies and acoustic signature changes downstream of the propeller. Notably, peak Sound Pressure Level (SPL) values at specific locations in the propeller’s wake demonstrating sensitivity to flow conditions. The investigation extends to near-field and far-field acoustic signatures, contributing to a comprehensive understanding of how acoustic behavior evolves with distance.

本研究针对INSEAN E-779A型四叶船用螺旋桨开展了全面的分析，同时覆盖水动力学与水声学两大研究维度。研究采用基于k-ω SST湍流模型的非定常雷诺平均纳维-斯托克斯（unsteady Reynolds-Averaged Navier-Stokes, RANS）模拟开展水动力学计算，并借助福斯-威廉姆斯-霍金（Ffowcs Williams-Hawking）声学比拟法完成声学分析。通过调整进速比（advance ratio）至0.6~0.9、入流攻角（flow incidence angle）至0°~40°，考察了大范围的运行工况。对不同空间方向的水动力系数进行计算，以深入揭示载荷对螺旋桨性能的影响规律。研究观测到显著的效率降幅，例如当进速比为0.88、入流攻角为40°时，螺旋桨效率从64%降至28%。定向声压分布呈现出明显的变化差异，例如当入流攻角为40°且进速比降至0.6时，声压分布的变化幅度达19%~31%。对声学信号开展快速傅里叶变换（Fast Fourier Transform, FFT）分析，明确了螺旋桨下游的主导频率与声学特征变化。值得注意的是，螺旋桨尾流中特定位置的峰值声压级（Sound Pressure Level, SPL）数值表现出对流动工况的敏感性。本研究同时覆盖了近场与远场声学特征，有助于全面理解声学特性随传播距离的演化规律。