轴流泵叶轮内部三维流场的ldv测量

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1、Iv扬州人学倾I‘学位论文velocityisnegativeonthebladetip，whichmeansthereisbackflow,andaccordingly'，thereisobviouscircumferentialvelocityandprewhirlflow．Atimpelleroutlet(TestLinebandc)，theradialdistributionofcircumferentiallyaveragedvelocityisdifferentfromeachotherondifferentconditions．Thereisobv

2、iousboundaryeffectintheradialdistributionofaxialvelocityandthemajorflowconcentratesinthemiddle．Onlowflowconditions，themajorflowofaxialvelocityleanstowardsbladetipandthereisbackflowonthehubside．Thetrendoftheradialdistributionofcircumferentialvelocityisthatitishighatbothendsanditislowi

3、nthemiddle．Astheflowdecreases，circumferentialvelocityonthebladetipsisrisingobviously．Thecircumferentialdistributionofthephaseaveragevelocityattheinletistypicalcascadeflow；axialvelocityislownearthebladesandishighonthemiddleofthevanepitchFromthebladebacktothepressuresideofblade．circumf

4、erentialvelocitychangesfrompositivetonegative．Thecircumferentialdistributionofthephaseaveragevelocityattheoutletisapproximatelycascadeflowtype，butvelocityfluctuatesseverely，thelowertheflow．thesevererthevelocityImpellerinternalflowexperimentalresultsshowthatthemajorflowofaxialvelocity

5、firstconcentrateinthemiddleofthegroove．andthengraduallyleantowardsbladebackasthewaterflowfromtheinlettotheoutlet；andthecircumferentialvelocityamplifies；insideoftheimpeller，neartheinletside，thereisnegativecircumferentialvelocitynearthebladeback；radialvelocityfluctuatesataxialsection．a

6、nditiShigherinthemiddleofthesection；onlowflowconditions．thereiSbackflowneartheinwalloftheinlet；waterrotatesseverelyinsidetheimpellerandastheflowrateamplifies，circumferentialvelocitybecomesmaller，therefore，onhighflowratecondition，thewateralmostdoesnotrotates；thereisalsobackflownearthe

7、hubonmeasuredconditionandtheclosertotheoutlet．thelargerthebackflowis：thelargertheflowrateiS。thesmallerthebackflowbecomesKeywords：Axial—flowpump；Impeller；Internalflow；LDV；3Dvelocity；Phaselock廖铭aJi轴流泉叶轮内部一维漉场的LDV测量目录摘i要．．．．．．．．．．．．．．．．．．．．．．⋯．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．

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