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时间:2018-07-20
《轴流泵流动噪声数值模拟_王宏光》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、轴流泵流动噪声数值模拟_王宏光第29卷第3期Vol.29No.3doi:10.3969/j.issn.1674-8530.2011.03.004轴流泵流动噪声数值模拟王宏光,徐小龙,杨爱玲,王凤华,谭永学(上海理工大学能源与动力工程学院,上海200093)摘要:为了研究轴流泵内部压力脉动和流动噪声在不同工况下的变化规律及其关系,采用数值模应用计算流体动力学软件Fluent和声学软件LMSVirtualLab分别模拟轴流泵流场和声场拟方法,分布,并进行时域和频域分析.取叶片非定常脉动力作为声源,运用边界元法对比分析了有泵壳振动影响和无泵壳振动影响下泵壳体边界声场分布的不同.结果表明:叶
2、轮叶片、导叶叶片和动静交界面处监测点的静压均表现出明显的离散频谱特性,叶片通过频率(BPF)是压力脉动和流动噪声的主频,这是由叶轮和导叶之间的动静干涉引起的;而流动噪声在2倍谐频(133.4Hz)和3倍谐频(200.1Hz)处也有明显峰值,这是由叶轮叶片和泵壳壳体振动引起的.忽略泵壳振动影响的情况下,噪声水平偏大,考虑声振耦合的噪声情况更接近于实际,所以结构振动是噪声辐射分析的重要因素.噪声指向性分布图表明了叶片噪声辐射具有明显的偶极子特性.关键词:轴流泵;流动噪声;通过频率;偶极子;声振耦合——————————————————————————————————————————————
3、—中图分类号:S277.9;TH312文献标志码:A文章编号:1674-8530(2011)03-0199-05Numericalsimulationofflownoiseinaxial-flowpumpWangHongguang,XuXiaolong,YangAiling,WangFenghua,TanYongxue(SchoolofEnergyandPowerEngineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China)Abstract:Inordertoresearchtherulesa
4、ndrelationshipbetweeninternalpressurepulsationandflownoiseunderdifferentconditions,flowfieldandacousticfieldofanaxial-flowpumpweresimulatedbycomputationalfluiddynamicssoftwareFluentandacousticsoftwareLMSVirtualLabnumerically,andthenbothtimeandfrequencydomainanalysiswereapplied.Takingtheunsteady
5、fluctuatingpressureexertedbythefluidonthebladeasnoisesource,BEMwasappliedtocomparethedifferenceofpumpcasingboundaryacousticfielddistributionsbetweentheconditionofacoustic-onlyandacoustic-vibrationcoupling.Theresultsshowthatstaticpressurepulsationineachcheckpointonimpellerblades,guidevanebladesa
6、ndinterfacesbetweenrotatingbladesandthestationarybladesshowobviouslydiscretespectrumcharacteristicsinspectrumdiagrams,———————————————————————————————————————————————andthebladepassingfrequencyisthedominatecontentsofboththepressurefluctuationsandflownoisedata,whichmanifeststhatthefluid-structure
7、interactionbetweentherotatingbladesandthestationaryonesmaybetheprimarydisturbancesource.Theflownoisefrequencyspectrahasobviouspeakatthedoubleharmonicfrequencyandthetripleharmonicfrequency.Neglectingthepumpcasingvibrationinfluence,
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