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ITS » Paper and Presentation » Rekayasa Konversi Energi - S2
Posted by aprill@is.its.ac.id at 29/09/2015 21:31:28  •  1077 Views


STUDI KARAKTERISTIK SEPARASI ALIRAN 3D PADA BIDANG TUMPU AIRFOIL ASIMETRI BRITISH 9C722.5C50 DENGAN PENAMBAHAN FORWARD FACING STEP TURBULATOR FFST

STUDY OF FLOW 3D SEPARATION CHARACTERISATION IN ENDWALL BODY AIRFOIL ASYMMETRY BRITISH 9C722.5C50 BY THE ADDITION OF FORWARD FACING STEP TURBULATOR FFST

Author :
JANNAH, IKA NUR ( 2112 202 007 )




ABSTRAK

Fenomena separasi aliran 3D merupakan bentuk kerugian aliran yang tidak bisa dihindari pada kompresor aksial. Terjadinya separasi aliran 3D pada kompresor aksial akibat adanya interaksi antara lapisan batas sudu blade boundary layer dengan lapisan batas casing atau lapisan batas hub casing-hub boundary layer yang terletak pada bidang tumpu. Separasi aliran ini menyebabkan terjadinya penyumbatan aliran blockage effect dan menurunkan tekanan pada kompresor. Horlock dan Lakshminarayana menyebutkan kerugian akibat aliran 3D menyumbang sebesar 50 dari total kerugian hidrolis pada kompresor aksial sementara kerugian energi akibat gesekan pada dinding annulus dan separasi 2D pada profile sebesar 30 dan 20. Dengan demikian salah satu usaha untuk meningkatkan efisiensi dari kompresor aksial dapat dilakukan dengan cara mengurangi kerugian akibat separasi aliran 3D. Penelitian ini dilakukan secara eksperimen dan numerik untuk mengkaji aliran melintasi pada bidang tumpu airfoil asimetri British 9C722.5C50 akibat penambahan forward facing step turbulator FFST dan tanpa FFST dengan variasi angle of attack 00 80 120 140 dan 160. Eksperimen dilakukan untuk menganalisa OFV yang terjadi pada bidang tumpu airfoil asimetri akibat penambahan FFST dan tanpa FFST pada wind tunnel dengan Reynolds number 1.64 x 105. Simulasi numerik menggunakan software Fluent 6.3.26 dengan model viscous standart k-epsilon. Hasil penelitian memperlihatkan bahwa dengan penambahan FFST dapat meningkatkan intensitas turbulent di daerah dekat dinding attachment line tidak terinduksi oleh horseshoe vortex sehingga aliran lebih mampu mengikuti kontur bodi akibatnya curling flow lebih lemah dan wake lebih sempit serta blockage energy loss dapat di reduksi. Reduksi energy loss yang paling efektif pada angle of attack 80 sebesar 736 .


ABSTRACT

3D flow separation phenomenon is a form of flow loss that can not be avoided in axial compressors. The occurrence of 3D flow separation on axial compressor due to the interaction between blade boundary layer with the hubcasing boundary layer which is located on endwall. This flow separation caused blockage effect and reduce pressure on the compressor. Horlock and Lakshminarayana mention of losses from the 3D flow donating 50 from total losses in the hydraulic axial compressor while the energy losses caused by friction on annulus and the 2D separation in profile by 30 and 20. Thus one of efforts to improve the efficiency from axial compressor can be accomplished by reducing losses due to 3D flow separation. This study was performed experimentally and numerically to study the flow characteristics endwall body airfoil asymmetry british 9C722.5C50 by the addition of forward facing step turbulator FFST dan without FFST with variation angle of attack 00 80 120 140 and 160. Experiments carried out to analyze the OFV that occurs at endwall body airfoil asymmetry with Reynolds number 1.64 x 105. Numerical simulation using FLUENT 6.3.26 with models viscous of standard k-epsilon. The results showed that the addition of FFST can increase the turbulent intensity in the region near wall attachment line is not induced by the horseshoe vortex so flow better able to follow the contours of the body. Consequently curling flow is weaker and wake more narrow and blockage energy loss can be reduction. Reduction of energy loss is most effective on angle of attack 80 at 7.36.



Keywordsseparasi aliran 3D; forward facing step turbulator (FFST); airfoil asimetri 9C7/22.5C50
 
Subject:  aerofoils
Contributor
  1. Prof. Dr. Ing. Herman Sasongko
  2. Dr. Ir. Heru Mirmanto, M.T.
Date Create: 29/09/2015
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-21121150007960
Collection ID: 21121150007960
Call Number: RTM 629.134 32 Jan s


Source
Paper and Presentations, Mechanical Engineering, RTM 629.134 32 Jan s, 2015

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Copyright @2015 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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