ANDRYANTO, ARISTO (2016) STUDI NUMERIK OPTIMASI POSISI VORTEX GENERATOR GUNA MEREDUKSI ALIRAN SEKUNDER DEKAT ENDWALL PADA AIRFOIL BRITISH 9C7/32.5C50. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Aliran fluida ketika melintasi suatu airfoil dekat end wall
akan terjadi aliran sekunder. Beberapa modifikasi bertujuan untuk
mereduksi aliran sekunder yang terjadi diantara airfoil dan endwall
dengan penambahan vortex generator telah dilakukan. Pada
penelitian ini akan dikaji tentang optimasi penempatan vortex
generator pada airfoil. Penambahan dan variasi penempatan vortex
generator yang dipasang pada airfoil di dekat endwall bertujuan
untuk menentukan posisi yang paling optimal yang dapat
mengarahkan aliran dekat endwall, sehingga aliran sekunder dapat
tereduksi.
Penelitian ini dilakukan dengan simulasi numerik. Model
benda uji berupa airfoil British 9C7/32.5C50 yang terpasang pada
endwall yang berbentuk pelat datar. Penambahan vortex generator
di dekat endwall dengan jarak YVG = 4%C dan sudut (β)=14.
Variasi jarak vortex generator terhadap leading edge yaitu XVG =
40%C, 45%C dan 50%C. sedangkan angle of attack diatur tetap (α
= 12°). Bilangan Reynolds yang digunakan adalah Rec = 1.14x105
Pemodelan numerik dilakukan mengunakan software Gambit 2.4
dan Fluent 6.3.26 dengan model 3ddp steady turbulent viscous
standard k-epsilon (SKE).
Hasil penelitian diketahui bahwa penambahan vortex
generator pada upper surface dari airfoil dapat meningkatkan
intensitas turbulensi aliran. Sehingga separasi 3 dimensi yang
terjadi di upper surface airfoil dekat endwall dapat ditunda dan
effective area semakin bertambah luas. Hal ini dapat mereduksi
kerugian energi yang membuat koefisien lift (CL) meingkat,
koefisien drag (CL) menurun dan total pressure losses coefficient
(ζ) menurun. Pereduksian energi paling optimal didapatkan dengan
menempatkan vortex generator pada posisi 45%C dari leading
edge, dengan peningkatan CL sebesar 3,67%, penurunan CD sebesar
2,7% dan penurunan ζ sebesar 9,3%.
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When fluid flow across an airfoil near endwall, a
secondary flow will occur. Some modifications aim to reduce
secondary flow that occurs between the airfoil and endwall with
the addition of vortex generators have been done. This research
will assessed on position optimization of vortex generators on the
airfoil. Additions and variations in the placement of vortex
generators mounted on the airfoil near the endwall aims to
determine the most optimal position which can direct the flow
near the endwall, so that the secondary flow can be reduced.
This research was conducted by numerical simulations.
Model test objects, airfoil British 9C7 / 32.5C50, is mounted on a
flat plate-shaped endwall. The addition of vortex generators near
endwall with ZVG = 0,04C distance and the angle of 14 °.
Distance variation of the leading edge vortex generator is XVG =
0,4C, 0,45C and 0,5C. while the angle of attack is fixed at 12°.
Reynolds number used was 114.000. Numerical modeling is done
using software Gambit 2.4 and Fluent 3.6.26 with 3ddp model
and steady turbulent viscous standard k-epsilon (SKE).
The survey results revealed that the addition of vortex
generators on the upper surface of the airfoil may increase the
turbulence intensity. So the 3 dimensional separation that occurs
in the upper surface of the airfoil near the endwall may be
delayed and increases the size of effective area. This phenomenon
can reduce energy losses that reduces lift coefficient, decreases
drag coefficient and decreases the total pressure losses
coefficient. The most optimal energy reduction is obtained by
placing a vortex generator on 0,45C position from the leading
edge, with an increase in the lift coefficient of 3.67 percent, a
decrease in drag coefficient of 2.7 percent and a reduction in
total pressure losses coefficient of 9.3 percent.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 629.134 32 And s |
| Uncontrolled Keywords: | airfoil British 9C7/32.5C50 , endwall, vortex generator, |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Users 13 not found. |
| Date Deposited: | 09 Jan 2017 04:02 |
| Last Modified: | 26 Dec 2018 03:14 |
| URI: | http://repository.its.ac.id/id/eprint/1393 |
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