Boundary Lyer Theory

670 XV111. I'nntlntnrt~t~nlrr of tt~rhrrlrnt, flow
A. N. Kolmogorov, C. 1'. von Wcizsncclzer 1641 and W. Ilciscnbcrg. As the frcqrtency
bcconirs cvcn I:irgrr, F(ir) clecrensee under ~IIC acttion of kincmnt,ic viscosit,y at, R
fa,ot,er mtc st.ill. Arcortling to W. IIciwnl~crg's t,hcory [Inn], nt vcry high vnlt~cs of
I'requcncy wc s11o111d nbscrve that F(a) - w7. 'Chc t,wo t.heoret.ica.l hws arc representrtl
in Fig. 18.9 hv thc t.wo stmight lines lnhrllrtl (I) niid (2), rnspcct.ively.
IPig. 18.9. Ikx-pmcy spectrttrn of
the longitudinal fluct~~ation in the
turbnlrnt horlndary layer on n flat
platc ~neas~~red by 1'. S. Klcbanoff I251
Cnrvo (I): F - n-513
Curve (2) : F -
Theory rlnc to W. Hciscnberg [I!)a]
J . h1nrCel1n.l [36n] pc:rfortnrtl tlct.n~ilccl rncnsurctncnt-7 on tile frcy~trnry spect,runl
in flows wit.h liolnogmrons turbulence. In particular, 11c invcstigat,ctl the effect, of n
strong t,wo-tlimrtisiond contrnction of thc st.rcam.
prrsswc Il~~ct~rintions it1 t,hcsc znncs move, nt, nn inst.n.ntmumr~s convect,ivc velocity of
40 t.o A00/, of n1rn.n stmnni nntl ill t.hr tlircct,ion of t01c mrnn stwnm. Tllc wnvo form
of s~trl~ fIuct~~l:lt,ions cl~angcs slowly ~it.11 titnc. See also the papers by W. I