Self-Similar Intermediate Structures in Turbulent Boundary L(10)
发布时间：2021-06-07
Self-Similar Intermediate Structures in Turbulent Boundary Layers At Large Reynolds Numbers
4Theremaininggroupofzero-pressure-gradientbound-
arylayerexperiments
Inthissectiontheresultsoftheprocessingarepresentedforalltheremainingseriesofexperiments.ForallofthemweusedthedatapresentedintheformofgraphsinthereviewofFernholzandFinley(1996).TheresultsoftheprocessingarepresentedinTable3andinFigures9–15.
Allthedatarevealtheself-similarstructureinthe rstintermediateregionadjacenttotheviscoussublayer.ThescalinglawsobtainedforthisregiongivevaluesoflnRe1andlnRe2,closetoeachother,althoughthedi erencebetweenlnRe1andlnRe2issometimeslargerthanintheexperimentsofthe rstgroup.Thescalinglaw(5)iscon rmedbyalltheseexperiments.Atthesametime,forthisgroupofexperimentsthesecondself-similarstructureadjacenttothefreestreamturnsouttobelessclear-cut,ifitisthereatall.Therefore,forthisgroupofexperiments,wedidnotpresenttheestimatesforthevaluesofβ.Neverthelesswenotethatwhenitwaspossibletoobtainestimatesofβtheyalwaysgaveaβlessthan0.2.Notealsothatforalltheseexperimentsthenumberofexperimentalpointsbelongingtotheregionadjacenttothefreestreamwaslessthanfortheexperimentsofthe rstgroup:thiswasanadditionalargumentforourreluctancetoshowherethesecondself-similarlayer.AsexplainedinSection3,wesuggestthattheturbulenceoftheexternal owintheexperimentsofthisremaininggroupwasmoresigni cant.
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