Sound Field Properties of Non-Cavitating Marine Propellers
Sound Field Properties of Non-Cavitating Marine Propellers
复制标题
非空蚀船用螺旋桨的声场特性
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Abdel‐Maksoud
中科院分区：
文献类型：
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作者：
Youjiang Wang;U. Göttsche;M. Abdel‐Maksoud
采用FWH（Ffowcs William-Hawkings）比拟与BEM（Boundary Element Method）方法相结合的混合方法研究了无空泡螺旋桨的声场特性。研究包括均匀和非均匀入流条件。在这两种情况下，主要的声源项和衰减率的噪声相对于距离螺旋桨中心进行了研究。研究了可渗透FWH方法中可渗透表面尺寸对水声结果的影响。为了进行调查，公式计算螺旋桨尾流片产生的声压首次提出。本文还讨论了可渗透FWH方法与边界元法耦合的相关问题，包括虚拟体积通量问题和船舶尾流场的考虑。结果表明，透流面尺寸对第一阶叶片通流频率的影响较小，但对第三阶叶片通流频率的影响不可忽略。在均匀来流情况下，厚度项占主导地位，而在非均匀来流情况下，载荷项占主导地位。
The sound field properties of non-cavitating marine propellers are investigated using a hybrid method, in which the FWH (Ffowcs William-Hawkings) analogy is coupled with the BEM (Boundary Element Method) approach. The investigations include both the uniform and non-uniform inflow conditions. For both conditions, the dominant sound source terms and the decay rate of the noise with regard to the distance to propeller centre are investigated. The influence of the permeable surface dimensions in the permeable FWH approach on the hydroacoustic result is also investigated. To carry out the investigations, the formulation to calculate acoustic pressure generated by the propeller wake sheet is proposed for the first time. The issues associated to coupling permeable FWH approach and BEM are also discussed, including the fictitious volume flux problem and the consideration of the ship wake field. It was found that the influence of the permeable surface dimension is little for the 1st BPF (Blade Passage Frequency), but cannot be ignored for the 3rd BPF. In the uniform inflow situation the thickness terms are found to be dominant, while in the non-uniform inflow situation the loading terms are dominant.