流激格栅孔腔自噪声特性数值计算研究  

Numerical study on self-noise characteristics of a flow-induced grid cavity

作　　者：孙铁志 谢勃汉 苗天丞 姜宜辰 丁言义 SUN Tiezhi;XIE Bohan;MIAO Tiancheng;JIANG Yichen;DING Yanyi(State Key Laboratory of Structural Analysis for Industrial Equipment,School of Naval Architecture,Dalian University of Technology,Dalian 116024,China;China Ship Development and Design Center,Wuhan 430064,China)

机构地区：[1]大连理工大学船舶工程学院工业装备结构分析国家重点实验室,辽宁大连116024 [2]中国舰船研究设计中心,武汉430064

出　　处：《振动与冲击》2022年第20期235-243,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52071062);辽宁省自然科学基金(2020MS106);中央高校基本科研业务费专项(DUT21LK25);辽宁省‘兴辽英才计划’项目(XLYC1908027)。

摘　　要：当水流流经水下航行体表面开孔时会产生随机的压力脉动并辐射噪声,为了研究流激水下航行体表面开孔自噪声特性和近场辐射噪声特性,基于大涡模拟和声学类比相结合的数值计算方法建立了数值预报模型,通过与文献中试验对比辐射噪声的一阶主频和二阶主频,验证了数值计算方法的有效性。基于建立的流激带格栅短开孔浅腔自噪声及辐射噪声预报方法,开展了有无格栅以及两种格栅类型对孔腔内流场特性、格栅处压力脉动声压级、距孔腔中心1 m处辐射噪声和去流段湍流压力脉动波数-频率谱的影响研究。结果分析表明,在该研究工况中无格栅孔腔内自噪声较小,格栅对辐射噪声有明显抑制效果,而倾斜格栅的抑制效果较好。In order to study the characteristics of self noise and near-field radiated noise,a numerical prediction model based on large eddy simulation and acoustic analogy was established.The first-order dominant frequency and the second-order dominant frequency of radiated noise were compared with the experimental results in the literature and the effectiveness of the numerical method was verified.Based on the self noise and radiated noise prediction method of a shallow cavity with a short opening grid,the effects of the grid and two grid types on the flow field characteristics,pressure fluctuation sound pressure level at the grid,radiated sound pressure level at 1 m away from the center of the cavity and turbulent pressure fluctuation wave number frequency spectrum in the outlet section were studied.Results show that the self noise in the cavity without grid is small,the grid has obvious suppression effect on radiation noise and wavenumber frequency spectrum,and the inclined grid has better suppression effect.

关 键 词：大涡模拟 流激孔腔 格栅 流噪声 波数-频率谱 

分 类 号：U661.44[交通运输工程—船舶及航道工程]