船舶消防90°弯管内流动声学特性研究  

of Flow inside 90°Bends for Ship Firefighting

作　　者：袁霄 蒋建珍 何周峰 刘厚林[2] 王凯[2] 

机构地区：[1]江苏振华海科装备科技股份有限公司 [2]江苏大学流体机械工程技术研究中心

出　　处：《工程机械》2024年第4期92-101,I0016,共11页Construction Machinery and Equipment

基　　金：国家自然科学基金(52179084);泰州市重大科技成果转化项目(SCG202205)。

摘　　要：为探究船舶管路的水下流动声学特性,提高舰船的声隐身性,以船用90°弯管为研究对象,采用LES与Lighthill声类比法相结合的方法,对不同曲率半径的90°弯管进行流场与声场的数值计算及试验验证。结果表明:随着曲率半径(R/D)的增大,90°弯管内侧涡状低压区减小,管内压力分布变均匀;R/D=1的90°弯管,平均压力与速度变化最大,平均压力下降了4.2%,平均速度增大了6.7%;管路中的流动噪声源主要为中低频噪声,且90°弯管的进出口段内流噪声主频与2阶结构固有频率接近,转向段内流噪声主频接近1阶耦合固有频率;90°弯管进口段内流噪声呈圆形分布,转向处的内流噪声呈偶极子分布,出口处内流噪声在R/D=1、R/D=2.5曲率半径下呈圆形,其余呈偶极子分布。To explore the underwater flow acoustic characteristics of ship pipelines and improve the acoustic stealth of ships,taking the 90°bends used in ships as the research object,the method combining the LES and Lighthill acoustic analogy method is used for numerical calculation and experimental verification of flow field and acoustic field of 90°bends with different radii of curvature.The results show that,with the increase of the radius of curvature(R/D),the vortex-like low-pressure area inside the 90°bend decreases,and the pressure distribution inside the bend becomes uniform.The 90°bend with R/D=1 has the largest change in average pressure and velocity,with a decrease of 4.2%in average pressure and an increase of 6.7%in average velocity.The flow noise source in the pipeline is mainly the medium-frequency and low-frequency noise,the main frequency of flow noise in the inlet and outlet sectionsof the 90°bend is close to the natural frequency of the secondorder structure,while the main frequency of flow noise in the turning section is close to the first-order coupled natural frequency.The flow noise in the inlet section of the 90°bend has a circular distribution,the flow noise at the turningpoint has a dipole distribution,and the flow noise at the outlet has a circular distribution ata radius of curvature R/D=1 and R/D=2.5,while the rest has a dipole distribution.

关 键 词：船舶管路 90°弯管 流动噪声 试验测量 声指向性 

分 类 号：U664.88[交通运输工程—船舶及航道工程]