叶轮旋向对喷水推进器噪声性能的影响(英文)  

Influence of Rotation Direction of Impeller on Noise Performance of Waterjet

作　　者：李留洋[1] 王永生[1] 付建[1] 易文彬[1] 魏应三[1] 杨琼方[1] 

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《船舶力学》2014年第12期1515-1523,共9页Journal of Ship Mechanics

基　　金：Supported by the National Natural Science Foundation of China(51009144)

摘　　要：文章运用计算流体力学和直接边界元方法计算叶轮旋向对喷水推进器水下辐射噪声性能的影响。首先,采用计算流体力学方法计算和分析了某喷水推进泵的裸泵性能曲线,并与厂商数据比较以验证CFD计算方法;然后,计算某＂船体＋流道＋喷水推进泵＂的稳态流场,在此基础上计算喷泵内的非定常流场,并获得了叶轮叶片、导叶叶片、轮毂和外壳壁面上的偶极源以及固体壁面上的单元和节点信息;最后,采用直接边界元方法计算喷水推进泵的声场分布。结果表明：喷泵内最大压力脉动在叶轮进口处,压力脉动幅值从轮毂到轮缘逐渐增大;叶轮进口处的压力脉动幅值外旋泵比内旋的大,但在叶轮和导叶相互作用区域则相反;在10~1000 Hz内,叶轮和导叶相互作用区域对于辐射噪声的贡献是最主要的;内旋泵的总声压比外旋泵的总声压级大2.4 dB。Computational fluid dynamic（CFD） and direct boundary element method（DBEM） were used to calculate the influence of rotation direction of impeller on noise performance of waterjet.Firstly, CFD was applied to calculate and analyze the open-water＇s pump performance of a mixed flow waterjet pump, the numerical result was compared with the manufacture＇s data in order to verify the credibility of numerical method. Secondly, the unsteady field of the ‘hull ＋ duct ＋ waterjet＇was calculated based on the steady result, from which the dipoles of the blade, stator, hub, shroud and the element node information of the solid surface could be obtained. Lastly, the direct boundary element method was applied to calculate the acoustic strength distribution of waterjet. The result show that the maximum pressure fluctuation is located at the impeller inlet, the pressure fluctuation amplitude increases from hub to shroud; in the impeller inlet the pressure fluctuation amplitude of the inward pump is stronger than the outward, but in the interaction area the outward pump is stronger. Between the 10~1000 Hz, the interaction area of the impeller and stator is the main acoustic source,the total sound pressure lever of inward pump is 2.4 dB larger than outward.

关 键 词：船舶 喷水推进 辐射噪声 偶极子 计算流体力学 边界元 叶轮旋向 

分 类 号：U664.34[交通运输工程—船舶及航道工程]