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ITS » Paper and Presentation » Rekayasa Konversi Energi - S2 Posted by dee@its.ac.id at 02/12/2014 19:15:33 • 1305 Views
STUDI EKSPERIMEN DAN NUMERIK 2D UNSTEADY-RANS PENGARUH INLET DISTURBANCE BODY TERHADAP KARAKTERISTIK ALIRAN MELINTASI DUA SILINDER SIRKULAR YANG TERSUSUN SECARA TANDEM PADA
SALURAN SEMPIT BLOCKAGE RATIO 20
STUDI KASUS UNTUK JARAK ANTAR SILINDER 15
EXPERIMENTAL AND NUMERICAL 2D UNSTEADY-RANS STUDY ABOUT THE INFLUENCE OF INLET DISTURBANCE BODY ON THE FLOW CHARACTERISTICS PASSING THROUGH TWO CIRCULAR CYLINDER WITH TANDEM ARRANGEMENT IN A NARROW CHANNEL Blockage Ratio 20
Case study for distance ra
Author : DAMAN, AIDA ANNISA AMIN ( 2111202203 )
ABSTRAK
Aliran yang melintasi suatu bluff body dalam hal ini silinder menimbulkan gaya drag yang sejajar
arah aliran dan gaya lift yang tegak lurus arah aliran. Beberapa penelitian dilakukan untuk
mereduksi gaya drag dengan cara memberi pengganggu di daerah upstream mengiris geometri
body dan meningkatkan kekasaran permukaan. Penelitian ini bertujuan untuk mengetahui
pengaruh silinder pengganggu terhadap karakteristik aliran melintasi dua silinder tersusun secara
tandem pada saluran sempit.
Penelitian ini dilakukan secara eksperimen dan numerik. Benda uji yang digunakan berupa dua
silinder sirkular berdiameter D 25 mm yang disusun secara tandem. Variasi jarak antar silinder
LD 15 2 25 3 35 4. Pada sisi upstream ditempatkan silinder pengganggu berdiameter d
4 mm dengan gap 948 04 mm dari permukaan silinder upstream dan variasi sudut 945 300 dan 600.
Bilangan Reynolds ReDh yang digunakan dalam pengambilan data pressure drop 521x104
sampai 156x105 sedangkan untuk pengambilan data koefisien tekanan velocity profile
perhitungan koefisien drag secara eksperimen dan simulasi numerik digunakan ReDh 156x105.
Untuk penelitian eksperimen susunan benda uji diuji pada wind tunnel dengan dimensi 125 mm x
125 mm x 2000 mm. Sedangkan penelitian secara pemodelan numerik 2D Unsteady-RANS
menggunakan perangkat lunak CFD dengan domain 125 mm x 1450 mm. Model turbulensi yang
digunakan k-969 SST.
Hasil yang diperoleh menunjukkan reduksi pressure drop dan koefisien drag total terjadi pada
konfigurasi tandem dengan IDB 300 sebesar 23 dari nilai konfigurasi tandem tanpa IDB.
Reduksi koefisien pressure drag maksimum untuk silinder upstream terjadi pada konfigurasi
tandem dengan IDB 300 sebesar 53 sedangkan untuk silinder downstream reduksi koefisien
pressure drag maksimum sebesar 90 terjadi pada konfigurasi tandem dengan IDB 600.
ABSTRACT
The forces acting on cylinder are drag force and lift force. Some experiment was varying
the geometry of cylinder and adding disturbance body to reduce the drag force. The
objective of this study is to discover the influence of inlet disturbance body on the flow
characteristics passing through two circular cylinder with tandem arrangement.
The research was carried out by experimental and numeric. The diameter of cicular
cylinder D was 25mm and distance ratio LD varied from 15 2 25 3 35 4. The
diameter of inlet disturbance body d was 4 mm and the gap 948 was 04 mm from
upstream cylinder. The angle of IDB 945 varied 300 and 600. The experimental research
was conducted in wind tunnel with 125 mm x 125 mm x 2000 mm dimension and used
Reynolds numder ReDh 521x104 - 156x105 for pressure drop. ReDh 156x105 was used
for pressure coefficient velocity profile and 2D Unsteady-RANS numeric simulation.
Numeric simulation used k-969 SST turbulence model.
The reduction of pressure drop and total drag coefficient occurs at tandem arrangement
with IDB 300 which has value 23 lower than tandem arrangement without IDB.
Pressure drag coefficient of upstream cylinder at tandem arrangement with IDB 300 was
reduced by 53. Pressure drag coefficient of downstream cylinder at tandem
arrangement with IDB 600 was reduced by 90..
Source Paper and Presentation of Mechanical Engineering, RTM 620.106 4 Dam s, 2014
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