叶片扩压器对模型级性能的影响研究

《叶片扩压器对模型级性能的影响研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、大连理工大学硕士学位论文叶片扩压器对模型级性能的影响研究姓名：刘赫申请学位级别：硕士专业：流体机械及工程（动力）指导教师：冀春俊20081201叶片扩压器对模型级性能的影响研究EffectoftheBladeDiffuseronthePerformanceofModelStageAbstractCentrifugalcompressorsarekeyequipmentsinpetrochemicals，metallurgyandmanyotherindustries．Thee伍ciencyandstabilityofthecentrifugalcompressorsarecruelalfor

2、thelong—periodand伽1loadsafeoperationofthewholeproductionline．Experiencesindicatethattheefjficiencyofthecompressorwitllbladediffuserishigherthanthatofwithnon-bladediffuser，butthepressuredisturbancecausedbythebladediffusermaypropagateupstreamthusaffecttheflowintheimpellerandultimatelycauseresonancest

3、ressandthefatiguefailureoftheimpellerblade．So也atinsomeindustry丘eldsespeciallyinchemicalindustry,non-bladediffuseraregenerallyusedinsteadofthebladediffuserforsafetyreasonsandthebenefitofhi出e萄[iciencyofthebladediffuserhastobesacrificed．nledesignmethodofthebladedifluSerthatwillnotcauseimpactiveforceon

4、theimpellerisailimperativekeytechniqueincentrifugalcompressorindustry．ThemodelstagestudiedizlthisthesisWaSdesignedbyNuovoPignoneinthe70slastcenturybutisstillinuseinmanufacturingfactoryinCMna．TheefficiencyofsuchamodelstageiSusually10％lowerthanthemodemstate．of-artproductsincRrrentmarket．Significantim

5、provementhadbeendonebyDUTfollowingmanynumericalexperimentsandaseriesofstructuremodifications．Theadoptionofthebladediffuserwasthekeyapproach．Butbeforethemodificationsbeingusedintherealdesign．theimpactiveforcecausedbythebladediffusermustbestudied．Steadyandunsteadynumericalanalysiswerecarriedoutinthis

6、papertoanalysisthepressuredisturbanceanditsimpactontheirepeller．BaseontheCFDsoftwareN∥7幽C乃。anumericalanalyticsystemforthemodelstagewasdeveloped．Basedonthebladediffuseroftheprototypedesignmodelstagewithsmallflowrate，numericalanalysisWasperformedtostudytheeffectoftheorientationandthebladechordofthebl

7、adediffuserrelativetotheimpelleron也eperformanceofthemodelstage．Simulationsresultswereanalyzedtostudytheinfluencesofthebladediffuseronthestageperformanceandtheoptimaldesignofthebladediffuser．Unsteadystateflo