大侧斜弹性桨非空泡噪声特性研究  

Non-cavitating Noise Characteristics of Large Skew Elastic Propellers

作　　者：罗岚心 吴绍维 韩国文 LUO Lanxin;WU Shaowei;HAN Guowen(School of Shipping and Naval Architecture,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学航运与船舶工程学院,重庆400074

出　　处：《噪声与振动控制》2024年第6期9-15,22,共8页Noise and Vibration Control

基　　金：国家自然科学基金青年资助项目(51909016);重庆市自然科学基金面上资助项目(cstc2020jcyj-msxmX0070);重庆市教委科学技术研究重点资助项目(KJZD-K202100702,KJQN201900705);高性能舰船技术教育部重点实验室开放基金资助项目(gxnc23052804)。

摘　　要：以某型七叶大侧斜螺旋桨为研究对象,视螺旋桨为弹性体,采用计算流体力学(Computational Fluid Dynamics,CFD)耦合有限元法(Finite Element Method,FEM)的双向流固耦合方法,计算螺旋桨水动力性能。通过现有试验数据及相关文献验证该数值方法的准确性。并基于时域下桨叶表面的脉动压力作为旋转偶极子声源,通过傅里叶变换及声学有限元软件LMS Virtual. Lab计算分析七叶大侧斜弹性桨的非空泡噪声特性。结果表明,在5~1 000 Hz频段内,弹性桨的辐射声压级大于刚性桨。桨叶低阶弹性振动容易被激发,产生共振。针对偶极子声源,桨叶轴向平面内,远场的声压指向性主要为“∞”形分布,并且轴向的声压级远大于盘面方向,更容易被敌方声纳探测。近水面会影响螺旋桨辐射声压级的大小,越接近水面,声压幅值越小,这一现象在远场点处更显著。此外,螺旋桨轴向两端的声压指向性受近水面影响呈现不对称分布。A seven-blade highly skewed propeller was taken as the research object.Regarding the propeller as an elastic body,its hydrodynamic performance was calculated by the two-way fluid-solid coupling method of computational fluid dynamics(CFD)and finite element method(FEM).The accuracy of the numerical method was verified by the existing experimental data and the related literature.With the fluctuating pressure on the blade surface in the time domain as the rotating dipole sound source,the non-cavitating noise characteristics of the seven-blade highly skewed elastic propeller were calculated and analyzed by Fourier transform and acoustic finite element software LMS Virtual.Lab.The results show that the radiation sound pressure level of the elastic propeller is greater than that of the rigid propeller in the 5-1000 Hz frequency band.The low-order elastic vibration of the blade is easily excited to produce resonance.For the dipole source,in the axial plane of the blade,the sound pressure directivity in the far field is mainly in-shaped distribution,and the axial sound pressure level is much larger than that in the disk direction,which is therefore easier to be detected by enemy sonar.The near-surface situation will affect the size of the propeller radiated sound pressure level.The closer to the surface,the smaller the sound pressure amplitude is.This phenomenon is more pronounced at the far field point.In addition,the sound pressure directivity at both ends of the propeller is asymmetrically distributed due to the influence of the near surface situation.

关 键 词：声学 非空泡噪声 七叶大侧斜弹性桨 双向流固耦合 偶极子声源 

分 类 号：U664.33[交通运输工程—船舶及航道工程]