双螺杆泵流场数值模拟

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1、NumericalAnalysisforTwinScrewPumpInternalFlowAThesisSubmittedtoChongqingUniversityinPartialFulfillmentoftheRequirementfortheDegreeofMasterofEngineeringByMisganawAbebeSupervisedbyProf.TangQianMajor：MechanicalEngineeringCollegeofMechanicalEngineeringofChongqin

2、gUniversity,Chongqing,ChinaMay2011M.A.DissertationofChongqingUniversity中文摘要摘要螺杆泵是一种特殊的容积式泵，它通过螺杆旋转形成容积变化的密封腔来输送液体。本文研究的目的是在不同的边界条件和转子转速下，利用旋转坐标系建立一种双螺杆泵的流场数值分析方法。本文基于CFD软件包FLUENT，采用有限容积法，利用非结构化网格，采用SIMPLEC算法计算速度——压力耦合，应用k-湍流模型来模拟不同出口压力和转速下的内部流场。对不同转速和压力条件下承

3、受进口压力和出口压力的液体进行分析，得到了螺杆泵流量变化曲线图。选择正确的方法来确定双螺杆泵流场分析的各种参数（如压力，速度，剪切应力，流量等）是非常重要的。本文提出的数值模型方法和重庆跃进机械有限公司双螺杆泵产品的相关数据做对比进行了验证。对螺杆泵内部流体参数进行分析以达到优化设计的目的。论文的研究工作也证明FLUENT软件利用单一旋转坐标系能够分析螺杆泵的湍流流动。关键词:双螺杆泵，流场分析，旋转坐标系IM.A.DissertationofChongqingUniversityABSTRACTABSTRAC

4、TScrewpumpsareaspecialtypeofrotarypositivedisplacementpumpinwhichtheflowthroughthepumpingelementsistrulyaxial.TheobjectiveofthisstudywastodevelopanumericalsolutionmethodforflowanalysisofatwinscrewpumpbyusingaSingleReferenceFrame(SRF)methodwithvariousboundary

5、conditionsandrotationalspeedsofrotoronsteadystatecondition.Flowvariablecontoursandplotswereobtainedforfluidflowinsideapumpsubjecttopressureinletandpressureoutletconditions,bygeneratinganunstructuredmeshonfinitevolumebasedcommercialCFDpackage.FLUENTisadoptedt

6、odiscretizegoverningequationsoftheflowcomputation,theSIMPLECalgorithmisappliedfordecouplingvelocityandpressuresolution,thesecondorderupwinddifferencingschemefortheconvectivetermsandk-turbulencemodeltocharacterizedtheinternalflowwithindifferentmagnitudesofou

7、tletpressureandrotationalspeeds.Itisimportantfordesign,thataccuratemethodsareavailabletodeterminevariousflowparameterssuchaspressure,velocity,shearstress,flowrateetc.fortheflowanalysisofthetwinscrewpump.Themethoddevelopedinthisworkwascomparedwiththegeneralda

8、taofChongqingYuejinMachineryCo.,Ltd.(CYM)twinscrewpumpproduct,asavalidationofthenumericalmodel.Anengineerwillbeabletousethesolutionmethoddeveloped,thisworkneedsfortheanalysisofflowparametersinsi