【作者】 宋明太； 顾湘南； 吕江； 黄红波； 唐登海；

【Author】 SONG Mingtai;GU Xiangnan;LYU Jiang;HUANG Hongbo;TANG Denghai;National Key Laboratory on Ship Vibration & Noise, Jiangsu Key Laboratory of Green Ship Technology,China Ship Scientific Research Center;

【机构】 船舶振动噪声重点试验室江苏省绿色船舶技术重点实验室中国船舶科学研究中心；

【摘要】 随着现代船舶向大型化、高速化发展,螺旋桨的高速旋转极易在梢部等处产生低压区,从而导致空化现象。空化是船舶水动力噪声中最强声源,对空化起始和空化噪声的研究一直是船舶工程中的热点和难点之一。由于其简易性和合理性,通过空化噪声频谱分析等的声学方法进行空化起始判别备受青睐。本文在大型循环水槽中进行了船后非均匀流场螺旋桨模型空化起始阶段噪声特性测试,通过常规频谱分析以及DEMON谱特征对螺旋桨空化起始判别进行了实验研究。结果表明:随着螺旋桨空化起始,噪声谱在整个频段均有升高,尤其是1-2kHz频段;通过2kHz附近频段滤波后的DEMON谱分析可以有效判别空化起始。更多还原

【Abstract】 As modern ships become larger and faster, the high-speed rotation of propeller generates low-pressure area around propeller tip, making propeller cavitation inevitable. Cavitation is the dominating sound source of ship’s hydrodynamic noise. The study of cavitation inception and cavitation noise thus has drawn consistent attention in ship engineering. Because of its simplicity and rationality, acoustic method such as cavitation noise spectrum analysis is becoming a powerful way to detect cavitation inception. In this paper, noise characteristics of propeller model during the inception stage in non-uniform flow field behind ship were tested in a large cavitation tunnel. Conventional spectra analysis and DEMON spectrum analysis were used to determine the propeller cavitation inception. The results show that as the propeller cavitation occurs, noise spectra increase in the entire frequency band, especially the 1-2 kHz band; DEMON spectrum analysis after filtering around the 2 kHz band can effectively determine the cavitation inception.更多还原