简介:Residualstressevolutionregularityinthermalbarrierceramiccoatings(TBCs)underdifferentcyclesofthermalshockloadingof1100℃wasinvestigatedbythemicroscopicdigitalimagecorrelation(DIC)andmicro-Ramanspectroscopy,respectively.Theobtainedresultsshowedthat,asthecyclenumberofthethermalshockloadingincreases,theevolutionoftheresidualstressundergoesthreedistinctstages:asharpincrease,agradualchange,andareduction.TheextensionstressneartheTBCsurfaceisfasttransformedtocompressiveonethroughjustonethermalcycle.Afterdifferentthermalshockcycleswithpeaktemperatureof1100℃,phasetransformationinTBCdoesnothappen,whereasthegeneration,development,evolutionofthethermallygrownoxide(TGO)layerandmicro-cracksarethemainreasonscausingtheevolutionregularityoftheresidualstress.
简介:Inthepaper,theturbulentdissipationisconsideredinthemodelforstudyingtheflowovermountains.Thegoverningequationisafirstorderordinarydifferentialequationderivedfromanalgebraicequationwithoutdissipationcase.Thesolutionissensitivetotheupstreamconditionofdissipation.Thedissipationnotonlyreducesthestrengthofdiscontinuitybutalsochangesthepropertiesofthegoverningequation.Inthepaper,thequalitativecharacteristicfeaturesofthegoverningequationarediscussed.Thenumericalresultswithsuperandsub-criticalcasesarealsodiscussedindetail.Theresultsshowthattheturbulentdissipationisanimportantfactorandisnotnegligible.
简介:SkyOverTibetIstheBluestinChinaNinetypercentoftheindustrialwastegas,waterandsolidwastedischargesintheTibetAutonomousRegionoccu...
简介:OZONEVALLEYOVERTIBETANPLATEAUZhouXtuji(周秀骥)andLuoChco(罗超)OZONEVALLEYOVERTIBETANPLATEAUZhouXtuji(周秀骥)andLuoChco(罗超)(ChineseAca...
简介:Aeratorisanimportantdeviceforreleaseworksofhydraulicstructureswithhigh-speedflowinordertoprotectthemfromcavitationdamage.Thiskindofprotectingeffectisrelatedcloselytocavitylengthbelowtheaerator,whilethecavitylengthisdominatedbytheemergenceangleovertheaerator.Thereforeitiscrucialtodeterminethisangleaccurately.Inthepresentpapertheaffectingintensitiesofflowdepthandthefluctuatingvelocityonthisanglewereanalyzedthroughtwointroducedparameters.Furthermore,theimprovedexpressionsofemergenceangleestimation,forbothramp-typeandstep-typeaerators,werepresentedbymeansof68setsofexperimentaldatafrom6projectsbasedonerrortheory.Theresultsshowedthatthepresentmethodhashigheraccuracythanthepreviouslyreportedmethods.