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ITS » Undergraduate Theses » Teknik Mesin
Posted by reini@its.ac.id at 23/11/2011 11:35:35  •  1074 Views


STUDI EKSPERIMEN KARAKTERISTIK ALIRAN MELINTASI EMPAT SILINDER TERIRIS TIPE-I 53 YANG TERSUSUN SECARA EQUISPACED DENGAN JARAK ANTAR SILINDER LD 4 DIDEKAT DINDING DATAR STUDI KASUS UNTUK PENGARUH JARAK GAP 0533 8804 GD 8804 0733

EXPERIMENT STUDY OF FLOW CHARACTERISTICS ACROSS FOUR 53 I-TYPE SLICED CYLINDER WITH EQUISPACED ARRANGEMENT AND DISTANCE BETWEEN CYLINDER LD 4 NEAR FLAT WALL Case Study of Gap Ratio Influence 0.533 8804 GD 8804 0733

Author :
ADRIANTO, HENDRA  ( 2107100049 )




ABSTRAK

Berbagai penelitian tentang mekanika fluida menunjukkan banyak hal yang menarik mengenai fenomena fluida ketika beberapa bodi diletakkan berdekatan dan terjadinya pengaruh antar susunan bodi. Dalam aplikasi teknik bodi berbentuk silinder baik tunggal maupun berkelompok seringkali disusun sedemikian rupa sehingga berdekatan dengan bentuk body lain seperti plat datar. Contoh aplikasi pada dunia teknik salah satunya adalah konfigurasi shell and tube pada heat exchanger. Selain bentuk silinder sirkuler penelitian dengan memotong silinder sirkuler bagian depan dan belakang sekaligus tipe-I dengan sudut pemotongan tertentu sudah banyak dilakukan. Tujuan dari pemotongan ini adalah upaya untuk mereduksi gaya-gaya aerodinamik yang timbul selama aliran fluida melingkupi struktur tersebut. Oleh karena itu tujuan dari penelitian ini adalah untuk mempelajari karakteristik aliran yang melintasi empat silinder teriris tipe-I 53 yang tersusun equispaced dan jarak antar silinder LD4 di dekat dinding datar dengan jarak gap 0.533 8804 GD 8804 0733 antara dinding dengan silinder. Penelitian ini dilakukan dalam sebuah subsonic wind tunnel dengan lebar 660 mm tinggi 660 mm dan panjang 1780 mm. Empat silinder tipe-I dengan sudut iris 53 yang terbuat dari pipa PVC digunakan sebagai model dengan diameter D 60 mm yang dipasang pada test section wind tunnel. Dinding datar yang terbuat dari smooth acrylic dengan tebal 60 mm dan panjang 1200 mm terpasang sejauh 100 mm dari dinding test section wind tunnel. Sisi depan dinding datar diiris dengan sudut iris 30o. Kecepatan freestream dijaga konstan pada 1412 ms sesuai dengan bilangan Reynolds Re 54x104 yang didasarkan pada diameter silinder dan kecepatan freestream. Jarak antar silinder ditetapkan konstan LD4. Jarak antara dinding dengan silinder divariasikan dari 0533 ke 0733 dengan kenaikan 0067. Pressure Transducer digunakan untuk mengukur distribusi tekanan pada silinder dan dinding. Profil kecepatan dibelakang susunan diukur menggunakan Pitot-static tube yang terhubung dengan pressure transducer. Untuk visualisasi aliran digunakan metode surface oil-film. Dari penilitian ditunjukkan bahwa seiiring dengan bertambahnya rasio gap GD didapatkan bahwa pengaruh dinding terhadap karakteristik aliran fluida yang melintasi silinder tipe I 53 tersusun equispaced semakin melemah. Pada silinder tipe I 53 upstream silinder 1 dan 2 untuk rasio gap 05338804GD88040733 akan muncul bubble separation di sisi lower. Sedangkan pada upperside bubble separation hanya terdapat pada upperside silinder 1 upstream dengan rasio gap 06008804GD88040733. Pengaruh penambahan rasio gap GD terlihat pada posisi separasi aliran nilai CP CDp CLp dan profil kecepatan dibelakang silinder.


ABSTRACT

Various researches on fluid mechanics show a lot of interesting things about the phenomenon of fluid when a body is closely placed. In engineering applications the cylinder body is often arranged so that contacting with other body shapes such as flat plates. Besides the circular cylinder a research done by slicing the front and rear circular cylinder type-I with certain cutting angles has also been made. The purpose of this slicing process is to reduce aero-dynamic forces that arise during the fluid flow surrounding the structure. Therefore the objective of this research is to study the flow characteristics across four 53 I-type sliced cylinders with equispaced arrangement and distance between cylinder LD 4 near flat wall with a distance gap 0533 8804 G D 8804 0.733 between the wall and the cylinders. This research was carried out in subsonic wind tunnel with test section 660 mm in width 660 mm in height and 1780 mm in length. Four I-type cylinders with 53 cutting angle made from PVC pipe was used as a model with D 60 mm diameter which was set up on wind tunnel test section. Flat wall made of smooth acrylic with 60 mm thick and 1200 mm length was installed on 100 mm from wind tunnel test section wall. Flat walls leading edge in front of wall was sliced on 30o angle. Free-stream velocity was constantly maintained at 14.12 m s according to the Reynolds number Re 5.4 x104 based on cylinder diameter and free-stream velocity. Distance between the cylinders was set constant at L D 4. The distance between wall and cylinder varied from 0.533 to 0.733 with a 0.067 increment. Pressure Transducer was used to measure the pressure distribution on the cylinder and wall. Velocity profile behind the cylinders arrangement was measured using a pitot-static tube connected to the pressure transducer. Oil flow picture method was used to visualize the flow pattern on cylinders. The research showed that with increasing gap ratio G D it was found that the influence of wall on the flow characteristics across a I-type 53 cylinders with equispaced arrangement was weakened. On the upstream I-type 53 cylinders cylinders 1 and 2 for gap ratio 0.533 8804GD8804 0.733 bubble separation will appear on the lower-side. While on the upper-side bubble separation only appear at upstream cylinder no. 1 with gap ratio of 0.600 8804GD8804 0.733. The effect of the gap ratio addition GD was shown at the flow separation position value of CP CDp CLp and velocity profiles behind the cylinder.



Keywordssilinder tipe I 53o; susunan equispaced; dekat dinding datar
 
Subject:  Aliran Gas
Contributor
  1. Prof. Dr. Ir. Triyogi Yuwono, DEA
Date Create: 26/07/2011
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-3100011043552
Collection ID: 3100011043552
Call Number: RSM 620.106 4 Adr s


Source
Undergraduate Thesis, Mechanical Engineering, RSM 620.106 4 Adr s, 2011

Coverage
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Copyright @2011 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-16210-abstract_id.pdf - 379 KB
  2.  ITS-Undergraduate-16210-abstract_en.pdf - 268 KB
  3.  ITS-Undergraduate-16210-conclusion.pdf - 315 KB




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