气流激振力作用下离心叶轮的瞬态响应分析.pdf

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1、第52卷第18期机械工程学报Vol.52No.182016年9月JOURNALOFMECHANICALENGINEERINGSep.2016DOI：10.3901/JME.2016.18.159*气流激振力作用下离心叶轮的瞬态响应分析肖军赵远扬舒悦(合肥通用机械研究院压缩机技术国家重点实验室合肥230031)摘要：为研究流场中离心叶轮受气流激振的瞬态响应问题，利用叶盘结构的循环对称性编制计算程序，实现了使用单扇区模型计算非循环对称力作用下离心叶轮的受迫振动。应用时间倾斜方法计算非等栅距情况下导叶/叶轮干涉的非定常流场，将叶片表面的气动力数据由流体网格插值到结构网格

2、。使用FEAST求解器计算基本扇区各节径下的振型数据，并将其由基本扇区展开至所有扇区，根据各扇区所受周期激励的时间差建立载荷矢量，结构动力方程的时域积分使用Newmark方法完成。以一半开式径向叶轮为例，进行了两种转速下叶盘结构的瞬态响应分析。单扇区模型与整体模型计算的位移响应结果符合较好，两个潜在共振点附近激振频率的振动响应均呈现出近于发散变化的趋势，表明了算法的正确性和预测气流激励导致共振的有效性。关键词：气流激振；瞬态响应；循环对称；时间倾斜；Newmark方法；共振中图分类号：TH113TransientAnalysisofCentrifugalImpel

3、lerwithGas-excitingForcesXIAOJunZHAOYuanyangSHUYue(StateKeyLaboratoryofCompressorTechnology,HefeiGeneralMachineryResearchInstitute,Hefei230031)Abstract：Inordertoinvestigatethetransientresponseproblemsofcentrifugalimpellerssubjectedtogasexcitationintheflowfields,analgorithmtocalculatet

4、heforcedvibrationsofimpellersundernon-cyclicaerodynamicforcesisrealizedusingthesingle-sectormodel.Thecyclicsymmetryofstructureisconsideredintheprogramming.Theunsteadyguidevane/impellerinterferencewithnon-equalpitchesissimulatedbythetimeinclinedmethod,andthentheaerodynamicforcesonblade

5、surfacesaretransferredfromtheflowmeshtothestructuralgrid.ModalshapesofdifferencenodaldiametersaresolvedbytheFEASTsolver,andthenthesedataareexpandedfromthebasicsectortoallsectors.Theloadvectorsareconstructedaccordingtothetimedifferencesofperiodicexcitingforcesamongthesectors.Afterthat,

6、theNewmarkmethodisadoptedtointegratethestructuraldynamicequations.Finally,thetransientresponseanalysesofaradialimpellerundertworotationalspeedsarecarriedout.Thedisplacementresponseresultsobtainedfromthesingle-sectormodelagreewellwiththosefromtheintegralmodel.Theresponsesundertwoexciti

7、ngfrequenciesnearthepotentialresonancepointsbothshowalmostdivergentvariationtrends.Alltheresultsmanifestthecorrectnessofalgorithmanditseffectivenesstopredicttheresonancecausedbygasexcitation.Keywords：gasexcitation；transientresponse；cyclicsymmetry；timeinclined；Newmarkmethod；resonance叶盘

8、结构是一种