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离心泵压力脉动的特性分析和测试 .doc

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AbstractCentrifugalpumpproducesstaticpressurecomponentsandproducesdynamicpressurecomponentsthatispressurepulsation.PressurepulsationissuperimposedonstaticpressurecomponentsjustlikeACsignals.Mostofthespiralvolutecentrifugalpumpvoluteringdistortionandasymmetryofthetonguecausedbyimpellerexitflowespeciallyinthenondesignconditionthedistortionismoreviolentsointhedesignofthespindlethepressuremustbeduetotheunbalanceddistributionoffluctuationcausedbyconsidering.Thepressurepulsationinthecentrifugalpumpisextremelycomplexandthepressurepulsationofthesamepumpisdifferentindifferentworkingconditions.Pumpinternalflowfieldandunsteadyturbulentcharacteristicstheimpellerandthewaterinletpipeoftherotorstatorinteractioneddycurrentandrefluxmaycausepressurepulsationmechanicalvibrationofthepressurepulsationexcitationpumpandpipelineaffectthenormaloperationofthepumpreducetheservicelifeofthepump；iftheexcitationfrequencyisclosetothefrequencyofthepump.Theresonancevibrationwilloccurwillproducepressurefluctuationsintheambientmediumadjacenthaveagreatnoise.Itcanbeseenthatthepressurepulsationinthepumpisanimportantfactoraffectingthestabilityofthepumpoperationandisalsoanimportantcauseofnoisepollution.Thereforeitisoneoftheimportanttaskstostudythepressurepulsationinthepumpandreducethevibrationnoiseofthepump.ThispaperfirstappliesCFDtechnologyFLUENTsoftwaretomonitorthepressurepulsationinimpellerandvolutesimultaneouslyundermultipleconditionssoastorevealtherelationshipbetweenpressurepulsationandcentrifugalpumpperformanceandprovideabasisforfurtherpredictionofunsteadyflowinducedpressurepulsationincentrifugalpumps.Inordertostudythecentrifugalpumpunderdifferentworkingconditionsandthevariationofpressurefluctuationbetweendifferentlo