简介：Toanalyzethemechanismofdragreducingeffectbycouplingflexibletubeswithturbulentflow,basedonexperimentalexaminationofmoreobviousturbulentdragreductioneffectinflexibletubesthaninrigidtubes,experimentalinvestigationwasperformedontheeffectofturbulentdragreduction,fluctuatingvibrationcharacteristicsofflexibletubeandthecorrelationsbyusingadouble-tubesystemandlaserdisplacementsensor.Theresultsareasfollows:withthedecreaseofthethicknessoftheflexibletubes,therootmeansquareoffluctuatingamplitudeoftheouterwallofthetubesincreases,andthenon-dimensionalburstperiodincreases,resultingintheincreaseofthereductionrateofdragcoefficientbycouplingflexibletubeswithturbulentflow.Atappliedpressure-balancedairontheouterwallandtheReynoldsnumberofabout1.75×104,thenon-dimensionalburstperiodsoftheflexibletubeswiththethicknessof2mm,3mm,4mmare141,126,105,respectively.