Experimental and Numerical Study of Swirling ... - Solid Mechanics

Experi imental and Numerical N Stud dy of Swirling g Flow in Scaveenging
Processs
for 2-Stroke
Marin ne Diesel Engin nes
Figure
2.1:
Classif fication of Swirl
Types (Moene, ( 2003).
swirling g flow. Thus the t focus in thhis
chapter is on the theoreetical
aspects of
confine ed swirling flow ws.
2.1
Classif fication of Confinned
Swirliing
Flowss
Swirl fl lows mostly are a classified based on theeir
tangential velocity profiile
(Vanyo 1993, Steenbergen
et al. 19998,
Hoffmannn
et al. 2002) ). Moene (2003)
has giv ven a rough classification of different tangential vvelocity
profilles
(Figure 2.1).
(a a)
(c c)
r a
(a) For rced Vortex: Flow
essentiallly
has a solid body rotationn
i.e. the lineear
(tan ngential in th his case) veloocity
increasees
with the iincrease
in thhe
dist tance from th he vortex cennter
(Figure 22.1a).
In case of a confineed
swi irling flow, the t tangentiall
velocity inccreases
with radius until it
reaches
the wall boundary layyer
where it ddecreases
to zeero
at the waall.
(b)
(d)
Chapter 2
12
Swirling Flows