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ANALISA PENGARUH PENGGUNAAN SUDU NACA 6412 DENGAN VARIASI SUDUT PENYEMPITAN ALIRAN AIR TERHADAP PERFORMA DAN EFISIENSI TURBIN AIR VORTEX
Get PDFEnergi saat ini semakin berkurang akibat penggunaan energi fosil yang berlebihan disemua bidang. Salah satu sumber energi yang banyak dilakukan penelitian adalah aliran air. Penggunaan berbagai macam-macam turbin semakin berkembang, Indonesia merupakan negara dengan potensi sumber daya air nomor 5 terbesar didunia. Potensi sumber daya air yang sangat melimpah dengan jumlah total 3.200 miliar m³/tahun. Pembangkit listrik tenaga air saat ini menjadi salah satu pilihan dalam memanfaatkan sumber energi terbaru. Penggunaan turbin air vortex sangat berguna untuk memaksimalkan potensi tersebut karena kebanyakan sungai di Indonesia memiliki head yang rendah. Penelitian dengan menggunakan metode penelitian eksperimen, yaitu dengan membuat turbin vortex dengan tipe sudu berpenampang lurus dan sudu naca 6412 yang memiliki tinggi sudu 30cm dan kapasitas air 10 l/s dengan variasi sudut penyempitan aliran 10°,20°,dan 30°. Pengujian akan dilakukan berdasarkan variasi yang digunakan terhadap performa dan efisiensi turbin vortex. Hasil penelitian yang di dapat bahwa bentuk sudu naca 6412 dengan sudut 10° memiliki performa dan efisiensi paling optimal dari pada sudu berpenampang lurus. Daya tertinggi dimiliki oleh turbin dengan bentuk sudu naca 6412 dengan sudut penyempitan aliran 10° memiliki daya sebesar 15,57 watt. Efisiensi tertinggi dimiliki bentuk sudu naca 6412 dengan sudut penyempitan aliran 10°, memiliki efisiensi sebesar 31,62%. Hal ini dikarenakan dengan bentuk sudu naca 6412, luasan permukaan sudu yang terkena hantaman fluida menjadi lebih merata, juga dengan sudut penyempitan 10° menyebabkan aliran votex tidak langsung cepat turun
KAJI EKSPERIMENTAL PENGGUNAAN SUDU DENGAN TIPE NACA 6412 TERHADAP KARAKTERISTIK TURBIN AIR CROSSFLOW
Get PDFTYPE NACA 6412 TERHADAP KARAKTERISTIK TURBIN
AIR CROSSFLOW
Zulfahmi Mahatma Ahmad
Program Studi Teknik Mesin S-1, FTI Institut Teknologi Nasional Malang
JL. Raya Karanglo KM. 2, Tasikmadu, Kec. Lowokwaru,
Kota Malang, Jawa Timur 65153
(0341) 417636
Email: [email protected]
ABSTRACK
Electrical energy is the main energy needed for electrical equipment /
energy stored in the electric current in amperes (A) and the electric voltage in
volts (V) provided that the need for electric power consumption is in Watts (W)
to drive motors, lighting , heats, cools or drives a mechanical device to produce
another form of energy. Piko Hydro Power Plant is a power plant that can
produce energy of less than 5 kW and can be classified as a small-scale power
plant. In this research, the type of water turbine that will be used is a type of
reaction turbine, namely the crossflow water turbine. In the manufacture of
crossflow water turbines, the tests were carried out in the energy conversion
laboratory of the Department of Mechanical Engineering, National Institute of
Technology, Malang, using NACA 6412 blades. The tests used variations in flow
rates including 4 l / s, 8l / s and 12 l / s. and guide vane angles 0⁰, 15⁰, and 30⁰.
The test used NACA 6412 blades, the number of blades was 14, the length of the
blade was 2.2 cm, and the blade height was 2 cm. The test results obtained are
variations in shaft rotation (rpm) and gate angle affect the results of shaft
rotation, power and turbine efficiency. At this time, the highest results were
obtained at an air flow rate of 4 l / sec with a guide vane angle of 0 ° with the
test results for the shaft 1967,2 rpm, turbine power 1319,65 watts, and a turbine
efficiency value of 48,24%.
Keywords : Crossflow Turbine, NACA 6412, Pichohydro, Shaft Rotation.
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KAJI EKSPERIMENTAL PENGGUNAAN SUDU DENGAN
TYPE NACA 6412 TERHADAP KARAKTERISTIK TURBIN
AIR CROSSFLOW
Zulfahmi Mahatma Ahmad
Program Studi Teknik Mesin S-1, FTI Institut Teknologi Nasional Malang
JL. Raya Karanglo KM. 2, Tasikmadu, Kec. Lowokwaru,
Kota Malang, Jawa Timur 65153
(0341) 417636
Email: [email protected]
ABSTRAK
Energi listrik adalah energi utama yang dibutuhkan bagi peralatan
listrik/energi yang tersimpan dalam arus listrik dengan satuan amper (A) dan
tegangan listrik dengan satuan volt (V) dengan ketentuan kebutuhan konsumsi
daya listrik dengan satuan Watt (W) untuk menggerakkan motor, lampu
penerangan, memanaskan, mendinginkan atau menggerakkan kembali suatu
peralatan mekanik untuk menghasilkan bentuk energi yang lain. Pembangkit
Listrik Tenaga Piko Hidro adalah suatu pembangkit yang dapat menghasilkan
energi listrik kurang dari 5 kW dan dapat diklasifikasikan sebagai pembangkit
listrik berskala kecil. Pada penelitian yang akan dilaksanakan ini jenis turbin
air yang akan digunkanan Pembangkit listrik tenaga mikro hidro (PLTPH)
adalah jenis turbin reaksi yaitu Turbin air crossflow. Pada pembuatan turbin
air crossflow, Pengujian dilakukan di labaratorium konversi energy Program
Studi Teknik Mesin Institut Teknologi Nasional Malang, menggunakan sudu
NACA 6412. Pengujian menggunakan variasi debit aliran meliputi 4 l/s, 8l/s,dan
12 l/s. dan sudut guide vane 0⁰, 15⁰,dan 30⁰. Pengujian menggunakan sudu
NACA 6412, jumlah sudu 12 buah, panjang sudu 2,2 cm, dan tinggi sudu 2 cm.
Hasil pengujian yang didapat yaitu variasi putaran poros (rpm) dan sudut guide
vane mempengaruhi hasil putaran poros, daya dan efisiensi turbin. Pada
pengujian ini didapatkan hasil tertinggi pada debit aliran air 4 l/s dengan sudut
guide vane 0° dengan hasil putaran poros 1967,2 rpm, daya turbin sebesar
1319,65 watts, dan nilai efisiensi turbin sebesar 48,24%.
Katakunci : Turbin Crossflow, NACA 6412, Pichohidro, Putaran Poros
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Complete Genome Sequences of Arcobacter butzleri ED-1 and Arcobacter sp Strain L, Both Isolated from a Microbial Fuel Cell
Get PDFArcobacter butzleri strain ED-1 is an exoelectrogenic epsilonproteobacterium isolated from the anode biofilm of a microbial fuel cell. Arcobacter sp. strain L dominates the liquid phase of the same fuel cell. Here we report the finished and annotated genome sequences of these organisms.</p
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Optimization of NACA 6412 Using Taguchi Method and Computational Fluid Dynamics Analysis
No full textIn this study, the aerodynamic performance of the NACA 6412 wing, which is widely used in aerodynamic systems with its high-performance ratio feature, is optimized using the Taguchi Method to simultaneously evaluate the effects of multiple parameters and to reduce the number of Computational Fluid Dynamics (CFD) experiments to an optimum level. Within the framework of the Design of Experiments (DOE) methodology, the analyses were carried out in the Reynolds number range Re = 100,000–200,000 to determine the optimum design conditions by considering five main factors: maximum camber (bmax), maximum camber position (x), angle of attack (α), maximum thickness (tmax), and free-flow velocity (V). In this direction, CFD simulations based on the Taguchi L16 orthogonal array were performed and the data obtained were statistically evaluated using Analysis of Variance (ANOVA). The lift-to-drag ratio (CL/CD) obtained from the optimum experimental parameter combination (NACA5310) determined by the Taguchi method is compared with the basic NACA 6412 airfoil and 16 other configurations included in the analysis. The results show that the optimized airfoil provides an improvement in performance of approximately 17% compared to the NACA 6412 airfoil
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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