排灌机械工程学报2011，Vol.29Issue(3)：199-203,5.DOI:10.3969/j.issn.1674-8530.2011.03.004
轴流泵流动噪声数值模拟
Numerical simulation of flow noise in axial-flow pump
摘要
Abstract
In order to research the rules and relationship between internal pressure pulsation and flow noise under different conditions, flow field and acoustic field of an axial-flow pump were simulated by computational fluid dynamics software Fluent and acoustic software LMS Virtual Lab numerically, and then both time and frequency domain analysis were applied. Taking the unsteady fluctuating pressure exerted by the fluid on the blade as noise source, BEM was applied to compare the difference of pump casing boundary acoustic field distributions between the condition of acoustic-only and acoustic-vibration coupling. The results show that static pressure pulsation in each checkpoint on impeller blades, guide vane blades and interfaces between rotating blades and the stationary blades show obviously discrete spectrum characteristics in spectrum diagrams,and the blade passing frequency is the doininate contents of both the pressure fluctuations and flow noise data, which manifests that the fluid-structure interaction between the rotating blades and the stationary ones may be the primary disturbance source. The flow noise frequency spectra has obvious peak at the double harmonic frequency and the triple harmonic frequency. Neglecting the pump casing vibration influence, the sound level is too high, while it is closer to practice with considering that influence. Therefore, structure vibration is very important in analyzing the noise radiation level. Noise directionality distribution chart indicates that blade noise radiation has obvious dipole characteristics.关键词
轴流泵/流动噪声/通过频率/偶极子/声振耦合Key words
axial-flow pump/ flow noise/ passage frequency/ dipole/ acoustic and vibration coupling分类
农业科技引用本文复制引用
王宏光,徐小龙,杨爱玲,王凤华,谭永学..轴流泵流动噪声数值模拟[J].排灌机械工程学报,2011,29(3):199-203,5.基金项目
国家自然科学基金资助项目(50976072) （50976072）
教育部博士点专项基金资助项目(20093120110004) （20093120110004）
上海市重点学科建设项目(J50501) （J50501）
