双吸泵作液力透平内部流动诱导噪声数值分析  

Numerical investigation of noise induced by internal flow of double-suction pump as hydraulic turbine

作　　者：夏勇[1] 王春林[1] 杨晓勇[1] 叶剑[1] 曾成[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2016年第6期483-489,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51109094);江苏高校优势学科建设工程项目

摘　　要：为进一步研究双吸离心泵在液力透平工况下振动与噪声的变化规律,采用一种间接混合计算方法即计算流体力学CFD与LMS Virtual-Lab声学仿真软件相结合的方式对双吸泵内部声场进行求解.利用k-ε湍流模型对双吸泵进行三维非定常流场计算,并在分析出偶极子声源为流动噪声的主要噪声源后,提取蜗壳表面以及叶片的压力脉动作为偶极子声源.基于LMS Virtual-Lab声学仿真模块,利用直接边界元法(DBEM)对内声场的数值仿真计算分析,得出了声学边界元模型表面声压级分布,以及内部主要检测点的声压级频率响应函数.结果表明:叶片通过频率及其谐频是产生流动噪声的主频,在叶频处泵蜗壳进口和叶片的声压值最大;各谐频处流动噪声也出现了峰值,但随着频率的增大,流动噪声的声压值明显衰减.研究结果为泵作液力透平工况下减振降噪提供有益参考.In order to research the change rules of vibration and noise of the double-suction pump, an hybrid algorithm based on computational fluid dynamic and LMS Virtual-Lab was adopted to calculate the inner sound field of the pump. The three-dimensional unsteady flow was calculated based on k - turbulence model, the pressure fluctuation of blade and volute surface was extracted as a dipole source when it becomes a main source of the flow-induced noise. Based on the LMS Virtual-Lab acoustic si- mulation, the direct boundary element method was applied to numerical simulation and analysis in order to calculate sound pressure level distribution of the acoustic boundary element sound model surface and sound pressure vibration with the change of the frequency. The results show that blade passing frequency and multiple frequency are the main frequency of the flow-induced noise, and there is the maximum value of sound pressure of the blade and volute in the condition of blade passing frequency. Even if a peak value appears in the multiple frequency, with the increase of frequency, the sound pressure of flow-induced is dramatically reduced. The results provide some useful references for low noise and vibration of pump as hydraulic turbine.

关 键 词：双吸泵 边界元法 液力透平 内声场 偶极子声源 声压级 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]