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ITS » Paper and Presentation » Teknik Mesin
Posted by dv@its.ac.id at 18/04/2016 12:06:52  •  1397 Views


STUDI EKSPERIMEN PENGARUH BILANGAN STROUHAL TERHADAP ALIRAN di BELAKANG SILINDER SIRKULAR YANG DIGANGGU SILINDER TERIRIS TIPE-D Studi Kasus Untuk Jarak SD 06 1375

Author :
AVIANTO, HANGGAR SANGRA ( 2109100125 )




ABSTRAK

Fenomena aliran melintasi suatu geometri benda telah diteliti sejak dahulu utamanya dalam memahami karakteristik aliran seperti koefisien drag koefisien lift maupun vortex shedding. Berbagai aplikasi dalam dunia nyata dapat dilihat pada struktur tiang-tiang bangunan jembatan. Fenomena vortex shedding menarik untuk diteliti lebih jauh. Pengukuran dengan menggunakan pitot static tube tidak dapat menjelaskan fenomena tersebut sehingga diperlukan alat ukur yang akurat untuk menerangkan fenomena vortex shedding. Fenomena vortex shedding dapat diketahui dengan mengetahui frekuensi vortex shedding sehingga dapat dihitung bilangan Strouhal. Metode penelitian yang digunakan adalah metode eksperimen dengan melakukan pengukuran frekuensi vortex shedding bilangan Strouhal dan koefisien tekanan pada silinder sirkular utama yang diganggu silinder teriris tipe-D 650. Pengukuran ini dilakukan pada bilangan Reynolds sebesar 53 x 104 dengan variasi jarak SD 06 1375. Kalibrasi HWA dilakukan untuk mendapatkan persamaan respon serta performa alat ukur dimana keluaran dari HWA dibandingkan dengan kecepatan referensi yang diukur oleh pitot static tube. Pengambilan data untuk perhitungan bilangan Strouhal dilakukan dengan menempatkan probe HWA pada jarak x 3D dan y 1D. Metode Fast Fourier Transform FFT digunakan untuk mengubah domain waktu ke bentuk domain frekuensi sehingga dapat diperoleh frekuensi vortex shedding. Hasil pengukuran menggunakan HWA untuk bilangan Reynolds sebesar 53 x 104 serta rasio diameter silinder teriris tipe-D 650 dan silinder sirkular dD sebesar 0125 didapatkan bilangan Strouhal yang semakin naik pada variasi jarak SD dari 06-1375. Bilangan Strouhal terbesar terjadi pada jarak SD 1375 yaitu sebesar 043454. Hasil perhitungan koefisien drag pressure CDP menunjukkan bahwa penggunaan silinder tipe-D 650 yang ditempatkan didepan silinder sirkular dapat mengurangi gaya drag pressure silinder sirkular. Jarak SD yang paling efektif mengurangi gaya drag pressure yaitu sebesar 1375 ditandai dengan CDP silinder sirkular turun menjadi 4527 berkurang 5473.


ABSTRACT

Current phenomenon traversing a geometry thing has been researched since long ago particularly to comprehend current characteristic such as drag coefficient lift coefficient and vortex shedding. Various applications in real problem can be observed in structure of the bridge poles. Vortex shedding is interesting to be examined any further. Measurement utilizing pitot static tube cannot explain the phenomenon so it needs accurate tool to describe vortex shedding phenomenon. Vortex shedding phenomenon can be observed by measuring the frequency of vortex shedding so Strouhal number can be obtained. The method used is an experimental method by measuring the frequency of vortex shedding Strouhal number and pressure coefficient in main circular cylinder which is disturbed by D-type cylinder 650. The measurement is examined to Reynolds number of 5.3 x 104 with distance variation SD 0.6 1.375. HWA calibration is examined to get respond equation and measurement equipment performance in which the output is compared to reference speed measured by pitot static tube. Data acquisition for calculating Strouhal number is done by placing probe HWA in x 3D and y 1D. Fast Fourier Transform method can be used to change time domain to frequency domain so it can get vortex shedding. The results of measurements using the HWA is increasing Strouhal number on the variation distance SD from 0.6 to 1.375 for the Reynolds number of 53 x 104 and ratio dD of 0.125. Strouhal number occurred at a distance of S D 1.375 is equal to 0.43454. The results of the calculation of the coefficient drag pressure CDP showed that the use of D-type cylinder 650 that are placed in front of the circular cylinder can reduce pressure drag force circular cylinder. The distance of S D is the most effective in reducing pressure drag force is equal to 1.375 with CDP main circular cylinder dropped to 45.27 54.73 decrease.



Keywordsvortex shedding; bilangan Strouhal; Fast Fourier Transform (FFT);
 
Subject:  Fluid dynamics
Contributor
  1. Prof. Dr. Ir. Triyogi Yuwono, DEA
Date Create: 18/04/2016
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-21121160008859
Collection ID: 21121160008859
Call Number: RSM 620.106 4 Avi s


Source
Paper and presentation, Mechanical engineering, RSM 620.106 4 Avi s, 2014

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Copyright @2016 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-paper-41174-2109100125-paper.pdf - 674 KB
  2.  ITS-paper-41174-2109100125-presentation.pdf - 1166 KB




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