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1、軸流泵流動噪聲數(shù)值模擬_王宏光第29卷第3期Vol.29No.3doi:10.3969/j.issn.1674-8530.2011.03.004軸流泵流動噪聲數(shù)值模擬王宏光,徐小龍,楊愛玲,王鳳華,譚永學(上海理工大學能源與動力工程學院,上海200093)摘要:為了研究軸流泵內(nèi)部壓力脈動和流動噪聲在不同工況下的變化規(guī)律及其關系,采用數(shù)值模應用計算流體動力學軟件Fluent和聲學軟件LMSVirtualLab分別模擬軸流泵流場和聲場擬方法,分布,并進行時域和頻域分析.取葉片非定常脈動力作為聲源,運用邊界元法對比分析了有泵殼振動影響和無泵殼振動影響下泵殼體邊界聲場分布的不同.結(jié)果表明:葉
2、輪葉片、導葉葉片和動靜交界面處監(jiān)測點的靜壓均表現(xiàn)出明顯的離散頻譜特性,葉片通過頻率(BPF)是壓力脈動和流動噪聲的主頻,這是由葉輪和導葉之間的動靜干涉引起的;而流動噪聲在2倍諧頻(133.4Hz)和3倍諧頻(200.1Hz)處也有明顯峰值,這是由葉輪葉片和泵殼殼體振動引起的.忽略泵殼振動影響的情況下,噪聲水平偏大,考慮聲振耦合的噪聲情況更接近于實際,所以結(jié)構(gòu)振動是噪聲輻射分析的重要因素.噪聲指向性分布圖表明了葉片噪聲輻射具有明顯的偶極子特性.關鍵詞:軸流泵;流動噪聲;通過頻率;偶極子;聲振耦合——————————————————————————————————————————————
3、—中圖分類號:S277.9;TH312文獻標志碼:A文章編號: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,