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
Figur re 4.47:
Pressure e Taps Location
on Scav venging Flow Test t
model.
4.4
Cylinder r Wall Prressure
MMeasureme
ents
For eac ch measuring g position annd
at a giveen
Reynolds number, stattic
differen ntial pressure is i measured beetween
a poinnt
close to the swirl generator
inlet (radial
distance e of 1 cm froom
inlet ) as the referencee
point and thhe
cylinder
wall at that given g positionn
(Figure 3.2).
Where P in is the pr ressure at thee
inlet and P z is the presssure
at a giveen
measuring
position as
mentioned iin
(Table 4.1).
The pre essure taps are e mounted at single point oon
the circummference
of eacch
measuring
cross sec ctional planee
(Figure 4.447).
The meaasured
pressuure
differen nce at differen nt positions tthus
providess
pressure droop
downstreaam
along th he cylinder len ngth with resppect
to test moodel
inlet.
The me easurements are a conducted using a high resolution Fuurness
digital differential micro m manommeter.
For eaach
position
measure ed for a time period of 3-5 min with dataa
acquisition f
The me easured differe ential pressuree
will represennt
an average v
case of three dimensional
swirlingg
flows especiaally
flow with
helical behavior of th he vortex, the pressure at thhe
wall change
followin ng the vortex behavior insidde
the cylinderr
and a measu
of 1s may m not resolve e the high freqquency
fluctuaation
of wall s
high Re e.
® FC05110
the pressure is
frequency of 11s.
value because in
h asymmetric oor
es with time i. .e.
urement intervval
tatic pressure at
Pressure
Tap
P
P
P
inn
z
Chapter 4
(4. 1)
98
Swirling Flow in a Pipe