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核电枞树型汽轮机叶片根部的超声相控阵检测技术 Abstract Inthedesignandoperationofnuclearpowerplants,thesafetyandreliabilityofequipmentarethemostimportantconsiderations.Theturbineisoneofthekeyequipmentinthepowerplant.Thebladeisacriticalcomponentoftheturbine.Thedamageofbladewilldirectlyaffectthenormaloperationoftheturbine,andevencauseaccidents.Inordertoensurethesafeandreliableoperationofthepowerplant,itisnecessarytocarryoutregularinspectionandmonitoringoftheblades.Inthispaper,wewillintroducetheultrasonicphasedarrayinspectiontechnologyoftherootofthesteamturbinebladeinthenuclearpowerplant.Theprinciple,advantagesandapplicationofthetechnologywillbediscussed. Introduction Inrecentyears,withtherapiddevelopmentofnuclearpowerindustry,nuclearpowerplantshavebecomeanimportantpartoftheenergysystem.Thesafetyandreliabilityofnuclearpowerplantshavebecometheprimaryconcernsofpeopleallovertheworld.Theturbineisoneofthekeyequipmentinthenuclearpowerplant,whichisresponsibleforconvertingthethermalenergyofthenuclearreactorintoelectricalenergy.Thebladeisacriticalcomponentoftheturbine.Itsdamagewilldirectlyaffectthenormaloperationoftheturbineandevencauseaccidents.Therefore,thedetectionandevaluationofthebladeisveryimportantforthesafeandreliableoperationofthepowerplant. Ultrasoundphasedarrayinspectiontechnology Ultrasonicphasedarrayinspectiontechnologyisatechniquethatusesmultipleultrasonicbeamstoscanacomponent.Eachultrasonicbeamcanbecontrolledinamplitude,phaseandtimedelay,whichnotonlyimprovestheinspectionsensitivityandaccuracy,butalsoreducestheinspectiontimeandincreasestheprobabilityofdetection.Therefore,ultrasonicphasedarrayinspectiontechnologyhasbeenwidelyusedintheinspectionandevaluationofcomponentsinnuclearpowerplants. Theultrasonicphasedarrayinspectiontechnologyfortherootofthesteamturbinebladeismainlyusedtodetectthesurfaceandsubsurfacedefectsoftheroot,suchascracks,erosion,corrosionanddelamination.Therootofthesteamturbinebladeisacomplexstructurewithhighrequirementsfortheinspectionaccuracyandsensitivity.Thetraditionali