Boundary Lyer Theory

c. Efict of ~urtintl on trnt~nition in n hn~rntlnry lnyer
It, has alrrntly Iwrn poitrI.ctl 0111, in CII:I~I. SIV t.hnt Ihc application of suction
I.o a 1:rminnr ho11rtt1:~ry hyrr is an rKcc1,ivc mmns of rrtlucing drag. The clrect of
surtio~~ is t.o st.nOilizr I hc h~ntlary laycr in n way sirnilnr to the cffcct of the prcssrlrc
gratlirnt tliscussctl in tl~o prccntling srctior~, antl the rrduction in drag is nchicvctl
1)y 1)rt:vc11ling tmnsilion fro111 I:~tnit):~r t,o IIII.I)IIICII~. flow. A marc (Ichilc(1 :~n:~lysis
rrvcnls t,l\nt. t.lrc it~fluc~~~cc of s~~vlion is (111~ to t.wo cficts. First, s~~ction ret111ccs thc
l)or~~l~l:~ry-l:~.yrr t~l1ic4tnrss n.ntl a t,l~it~nc.r I)ol~ntl:~ry hyrr is loss prom t,o I)ocome l.t~rbrllrnl..
St~:ontlly, s~~t:l.ion crr:~l.rs :I. I:~n~it):~r. vc~loc~il.y 1)rofilc which ~~ossc:ssc~ higl~rr
limit. of stal1ilil,y (c:rit.ic::d I