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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS Jurnal Reka Lingkungan IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Teknik Kimia Journal of Engineering and Technological Sciences Journal of Energy, Mechanical, Material and Manufacturing Engineering Sewagati Riwayat: Educational Journal of History and Humanities
Gunawan Nugroho
Department Of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111
Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Journal : Jurnal Teknik Mesin

 1 
Studi Numerik dan Eksperimental Aliran 3-D pada Kombinasi Airfoil Pelat Datar dengan Variasi Permukaan Bawah dan Pengaruh Celah Gunawan Nugroho; Herman Sasongko
Jurnal Teknik Mesin (Sinta 3) Vol. 7 No. 2 (2005): OCTOBER 2005
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

Recently, the complexity of 3-D flow around airfoil/flat plate junction at endwall region has attracted many researchers of Aerodynamics. The majority of its experimental and numerical observations are conducted to compressor cascade. Because of that importance, stronger conceptual basis of 3-D flow is required, so the present study has stressed on single body airfoil/flat plate which clearance effect is exist. Variation of angle of attack and geometry on lower surface in this research have been carried out numerically and experimentally. Numerical study has been implemented by putting inlet velocity 25 m/s as initial condition while air density and viscosity are assumed constants. Trends of coefficient of pressure and velocity vector are studied accurately. Experimental study was conducted in wind tunnel with inlet velocity 25 m/s by means of measurement of static pressure on wall and airfoil which endwall and midspan are included. Two previous methods were supported by flow visualisation in the manner of examining the details of skin friction line. It was evidenced that 2-D history flow was strongly influenced 3-D flow characteristics. It was clarified by lower surface variation and by usage of wider blade thickness model, that was when incoming flow attached to leading edge would experience stronger adverse pressure gradient with the result that separated earlier and so was when it pass more curved surface, stronger adverse pressure gradient is responsible for generating greater pressure difference between upper and lower surface and finally, tip clearance flow is induced more intensivelly. Those effects are amplified when angle of attack is applied. Saddle point is formed further away in front of leading edge and tend to move on pressure side below, Wider branch separation line is detected and jet flow is amplified. Abstract in Bahasa Indonesia : Kompleksnya aliran 3-D pada daerah endwall dan ujung dari kombinasi airfoil/plat datar telah menarik perhatian para peneliti di bidang Aerodinamika pada tahun-tahun belakangan ini. Penelitian aliran 3-D dilakukan terutama pada kompresor kaskade baik secara eksperimental maupun numerik. Oleh karena itu, untuk memberikan dasar yang lebih kokoh, penelitian ini menitikberatkan pada kombinasi airfoil tunggal/plat datar dengan memberikan pengaruh celah. Penelitian ini dilakukan secara numerik dan eksperimental dengan melakukan variasi geometri pada permukaaan bawah dan sudut serang 00. Dalam studi numerik, kerapatan dan viskositas udara dianggap konstan serta aliran masukan sebesar 25 m/s. Parameter- parameter yang diperhatikan dalam analisa adalah tekanan statik, tekanan dinamik, kecepatan, dan tegangan geser. Studi eksperimental dilakukan pada wind tunnel dengan kecepatan aliran masukan 25 m/s dengan daerah pengukuran tekanan statik pada dinding dan badan airfoil yang meliputi ujung dinding, ujung celah dan tengah badan airfoil. Visualisasi aliran dilakukan untuk mendukung studi numerik dan pengukuran tekanan statis dengan melihat detil konfigurasi garis gesekan kulit. Dari penelitian didapatkan bahwa formalisme 2 D flow terbukti sangat mempengaruhi karakteristik aliran 3 dimensi. Variasi permukaaan bawah dan penggunaan model dengan ketebalan bilah yang besar menegaskannya, yaitu aliran yang menuju ujung depan akan mengalami gradien tekanan balik yang lebih besar sehingga aliran akan lebih cepat terpisahkan dan begitu juga jika aliran melewati kontur lebih lengkung, gradien tekanan balik yang lebih besar menginduksikan ujung celah flow yang lebih kuat Kata kunci: Titik sadel, ujung-celah, aliran jet, gradien tekanan balik dan vortex ujung celah.
Studi Numerik Pengaruh Geometri dan Desain Diffuser untuk Peningkatan Kinerja DAWT (Diffuser Augmented Wind Turbine) Adhana Tito Hary Wibowo; Ruri Agung Wahyuono; Gunawan Nugroho
Jurnal Teknik Mesin (Sinta 3) Vol. 14 No. 2 (2013): OCTOBER 2013
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

Numerical study was conducted on the effect a variation of flange angle on diffuser DAWT performances using Computational Fluid Dynamics (CFD). This research objective is to perform and analyze the flow characteristics such as Velocities profile and static pressure profile on the effect of diffuser’s flat flanged tilt angle. Verification of computation condition result by comparing data qualitative data and quantitive data Ohya’s experiment, (2008).  Qualitative analysis showed by velocity contour, streamline contour and velocity vector. Quantitative result showed by the velocity increased profile and static pressure profile graph. The streamline of simulation result showed the bigest blockage effect due to of airflow is flange with angle 900. This effect caused the vortex formation at back side of flange. Velocity vector contour given prediction on direction of stream flow tip losses reduction at the backside of flanged diffuser. Quantitative data showed  flow performance in interior diffuser with top increased velocity augmentation of flanged diffuser is angle 900 by 9,82 m/s or 1,96 times freestream velocities and static pressure coefficient value by -2.85.
Co-Authors Aank Suseno Abdurrahman Rahyang Tutuko Adhana Tito Hary Wibowo Adia Cahya Purnama Agung Dwi Sulaksono Agus Imam Sonhaji Agus Imam Sonhaji, Agus Imam Agus Muhammad Hatta Akhmad F. Alhikami Akhmad Faruq Alhikami Aulia Muhammad Taufiq Nasution Aulia Siti Aisjah Detak Yan Pratama Eka Puji Kurniawan FITRIA, NOVI Halen Dinata Atmaja Hamidah, Nur Laila Herman Sasongko Heru Mirmanto Hudiyo Firmanto, Hudiyo Iwan Cony Setiadi, Iwan Cony Joko Waluyo Kadek Chestha Amrita Masrufaiyah Masrufaiyah Mohammad Adenan Ni Putu Rika Puspita Dewi Ola Dwi Sandra Hasan Putra, Herlian Eriska Putu Angga Kristyawan Rachmad Andri Atmoko Raditya, Murry Ridho Bayuaji Ridho Hantoro Ruri Agung Wahyuono Sangadji, Anisa Sarwono SATRIYAS ILYAS Sekartedjo Sekartedjo Sukmasari*, Luthfiyah Revi Sukmawati, Wina Ike Sulaiman, Sani Maulana Totok R Biyanto Totok R. Biyanto Totok R. Biyanto Totok Soehartanto Wahyu Hendra W Yusuf Wibisono Zaini, Ahmad