Liu Tengyan, Qiu Jitao, Geng Haohan, Cai Youlin, Wang Zonglong, Tao Jin
Marine Propulsion Division, Marine Design & Research Institute of China, Shanghai, China.
Sci Prog. 2025 Apr-Jun;108(2):368504251336888. doi: 10.1177/00368504251336888. Epub 2025 Apr 24.
The immersed waterjet propulsion method represents an innovative advancement in traditional waterjet propulsion technologies. Unlike previous studies that primarily rely on fluid-induced acoustics theories, such as the Lighthill's equations, this research experimentally validates key parameters affecting radiated noise levels, including jet velocity and nozzle pressure, providing new insights into noise reduction mechanisms in immersed waterjet systems. Through a comparative analysis of noise emission profiles, this study demonstrates that immersed waterjet devices exhibit a substantial reduction in underwater radiated noise, particularly within the critical low-frequency range of 1 to 5 kHz, where the noise reduction is most pronounced. By conducting controlled experimental assessments, this research contributes to a more comprehensive understanding of the underlying acoustic features and their influencing factors. Additionally, the study contextualizes its findings within the broader scope of naval propulsion systems, highlighting how immersed waterjet propulsion can significantly enhance stealth capabilities. The key contributions of this study lie in its detailed characterization of radiated noise mechanisms and its provision of empirical evidence that extends beyond theoretical predictions. The results of this study bridge a crucial gap in the literature by offering experimental insights into the radiated noise characteristics of immersed waterjet propulsion, a topic that has been less explored due to operational and technical challenges. Specifically, the immersed waterjet propulsion system demonstrated a reduction in underwater radiated noise by up to 12 dB in the 1 to 5 kHz frequency range compared to traditional stern-type systems under identical conditions. These findings lay a strong foundation for further optimization and application of immersed waterjet propulsion systems in modern naval and commercial vessels.
浸入式喷水推进方法代表了传统喷水推进技术的一项创新性进展。与以往主要依赖流体诱导声学理论（如莱特希尔方程）的研究不同，本研究通过实验验证了影响辐射噪声水平的关键参数，包括喷流速度和喷嘴压力，为浸入式喷水系统的降噪机制提供了新的见解。通过对噪声发射剖面的对比分析，本研究表明浸入式喷水装置的水下辐射噪声大幅降低，尤其是在1至5千赫的关键低频范围内，降噪最为显著。通过进行可控实验评估，本研究有助于更全面地理解其潜在声学特征及其影响因素。此外，该研究将其发现置于更广泛的海军推进系统背景下，强调浸入式喷水推进如何能显著增强隐身能力。本研究的关键贡献在于其对辐射噪声机制的详细表征，以及提供了超越理论预测的经验证据。本研究的结果弥补了文献中的一个关键空白，通过提供关于浸入式喷水推进辐射噪声特性的实验见解，该主题因操作和技术挑战而较少被探索。具体而言，与相同条件下的传统艉型系统相比，浸入式喷水推进系统在1至5千赫频率范围内的水下辐射噪声降低了高达12分贝。这些发现为浸入式喷水推进系统在现代海军和商用船舶中的进一步优化和应用奠定了坚实基础。
