Hydroacoustic and hydrodynamic investigation of bio-inspired leading-edge tubercles on marine ducted thrusters

Underwater radiated noise (URN) has a negative impact on the marine acoustic environment where it can disrupt marine creature’s basic living functions such as navigation and communication. To control the ambient ocean noise levels due to human activities, international governing bodies such as the International Maritime Organisation (IMO) have issued non-mandatory guidelines to address this issue. Under such framework, the hydroacoustic performance of marine vehicles has become a critical factor to be evaluated and controlled throughout the vehicles’ service life in order to mitigate the URN level and the role humankind plays in the ocean. This study aims to apply leading-edge (LE) tubercles of the Humpback whales’ pectoral fins to a benchmark ducted propeller to investigate its potential in noise mitigation. This was conducted using CFD, where the high-fidelity Improved Delayed Detached Eddy Simulations (IDDES) in combination with the porous Ffowcs-Williams Hawkings (FW-H) acoustic ana...

水下辐射噪声（Underwater Radiated Noise, URN）会对海洋声学环境造成负面影响，可干扰海洋生物的导航、通讯等基本生存机能。为管控人类活动引发的海洋环境噪声水平，国际海事组织（International Maritime Organisation, IMO）等国际管理机构已发布非强制性指南以应对该问题。在此框架下，为降低水下辐射噪声水平、减轻人类对海洋的不利影响，水下航行器的水声学性能已成为其全服役周期内需评估与管控的关键指标。本研究旨在将座头鲸胸鳍的前缘结节（Leading-edge, LE）应用于基准导管螺旋桨，以探究其在噪声抑制方面的潜力。本研究采用计算流体动力学（Computational Fluid Dynamics, CFD）方法开展相关研究，通过高保真的改进延迟分离涡模拟（Improved Delayed Detached Eddy Simulations, IDDES）结合多孔介质福克-威廉姆斯-霍金斯（Ffowcs-Williams Hawkings, FW-H）声学类比……