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Fitroh, Ahmad Jamaludin
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Aerospace Engineering Astronomy

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PENGARUH VARIASI SUDUT SERANG SUDU PADA PRESTASI TURBIN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin; Hartono, Firman
Indonesian Journal of Aerospace Vol. 4 No. 2 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Research on variations of angle of attack turbine blade has been conducted to investigate their correlation with windturbine performances, and for these purposes, AEROFOIL LS (1)-0417 MOD has been selected with 4 angle variations. The first variation is selscted with constant slipstream, the second with Cl max of 0.3, while the third and fouth variations with Cl max of 0.5 and 0.7 respectively. Based on blade element and momentum theory for obtaining efficiency, the following results for all the four variations are 18.15 percent, 16.46 percent, 16.15 percent and 16.26 percent. Hence, it can be concluded that, a highest efficiency is obtained with a constant slipstream as in case 1. In practice, to achieve such configuration, a more accurate blade fabricantion process is required to obtain the highest efficiency.
SIMULASI PENGUJIAN PRESTASI SUDU TURBIN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 4 No. 2 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Identification of whether aerodynamic performances of a rotor blades has met the criteria according to its design or not, the general procedure is to fabricate and perform a field testing; or testing its model in a windtunnel. Both method require high cost however; therefore, a simulation method using Fluent software had used for obtaining lower cost. The model used in an LS (1)-0417 Mod airfoil having 3 blades and rotor diameter 7.21 m. Simulation test shows a good result with a difference of 4.61 percent for torque and power from design result.
EFEK DEFLEKSI PADA SUDU TURBIN ANGIN TERHADAP KELUARAN DAYA Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 4 No. 1 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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The type of material used in the fabrication of wind turbine blade is a very important factor so that it will not exceed the allowable maximum deflection. An analysis is conducted to study this deflection effect to that power output and as case study, a 7.6 m blade of 10 kW LPN 10000 E turbine is used. Several assumption as such as deflection due to wind speed at perpendicular to local plane local blade are diameter blade and direction of aerodynamic at aerofoil plane local blade are considered. The distribution of blade deflection along the twisted span is assumed uniform. Calculation is performed for the polynomial order of 2,3 and 4, with variety of deflection of 0.2 m, 0.5m, 1 m and 1.5 m. for design wind speed of 9 m per s it was found that for 0.5 deflection, the losses of 6 percent, 9 percent and 12 percent for blade shape polynomial order 2,3 and 4 consequentively are produced; whereas for 1.5 m deflection, losses are 46 percent, 53 percent, and 56 percent for the same polynomial shape. If a maximum loss of 10 percent is taken, then the max allowable deflection is 0.5 m.
ANALISIS DAN OPTIMASI SUDU SKEA 5 KW UNTUK PEMOMPAAN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 8 No. 2 Desember (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

LAPAN Wind Energy Conversion System (WECS) for pumping (SKEA-MARUTO) has a rotor diameter of 4.5 m and 6 number of blades. The blade used is a curved plate area. The result of recalculation has shown that operational condition on 10 m/sec wind speed and 100 rpm rotational speed, the rotor produces 4.74 kW. By assuming of 20% generator losses, the SKEA will produces power of 3.79 kW. To improve this performance to 5 kW, the rotor diameter has to be increased to 6 m. Chord and twist distribution are made similar to the previous design, and remain unchanged. Calculation is made by varying number of blades and blade rotation. At the wind speed of 10 m/sec and the rotational speed of 100 rpm, the SKEA able to produce the power of 6.36 kW.
SIMULASI DAN PERHITUNGAN SPIN ROKET FOLDED FIN BERDIAMETER 200 mm Fitroh, Ahmad Jamaludin; Saeri
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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One of rocket movement types is spin maneuver. The rocket rotation towards the axisymmetric axis is needed so the rocket can move straight in it’s flight line. The object of spin simulation and calculation in this work is the Rocket of LAPAN with the diameter of 200 mm. The simulation and calculation were done for 0.6, 1.0, 2.0, and 3.0 Mach of flight speed. The simulation and calculation results show that spin anddrag of fin will increase while the flight speed is increasing. The spin and drag of fin for 3.0 Mach of flight speed are 36 rps and 16.6 kg respectively
ANALISIS RADIUS AMAN AKIBAT KEGAGALAN STRUKTUR SUDU SKEA 50 KW PADA SAAT BEROPERASI Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Analysis on the safe radius of a blade structural failure during operation, is studied on this paper. The particular blade under analysis is the SKEA 50 kW LAPAN. The rotor is installed at 18 m height. The analysis is based on the modified straight motion and rotational momentum formulation. The result showed that at the maximum design rotational speed of 80 rpm, the blade would be thrown out of it centre to 73 m horizontally, and 35 m vertically above the ground. On the other hand, the failure at the root of the blade would be thrown and spinned at its centre of mass at the speed of 145 rpm.
ANALISA PENGARUH SUDUT PITCH, UNTUK MEMPEROLEH DAYA OPTIMAL TURBIN ANGIN LPN-SKEA 50 KW PADA BEBERAPA KONDISI KECEPATAN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 7 No. 1 Juni (2009): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Kurva daya merupakan indikator utama prestasi sebuah turbin angin. Dengan sudut pitch tertentu, turbin angin mempunyai kurva daya yang tertentu juga. Rotor dirancang agar turbin angin LPN-SKEA 50kW dapat menghasilkan daya 50 kW pada kecepatan angin 10 m/det dan kecepatan putar 80 rpm. Penambahan sudut pitch biasanya dilakukan untuk menambah torsi awal rotor sehingga rotor menjadi lebih mudah berputar dari kondisi diam. Pengaruh penambahan sudut pitch adalah berkurangnya kecepatan putar rotor sehingga daya yang dihasilkan juga menjadi lebih kecil. Hasil perhitungan menunjukkan bahwa penambahan sudut pitch hingga 10º akan mengurangi daya dari 50 kW menjadi 23,3 kW pada kecepatan angin 10 m/det. Dengan penambahan sudut pitch yang sama dan dengan mengasumsikan bahwa kurva daya merupakan polinomial pangkat tiga, maka daya sebesar 50 kW dapat dicapai pada kecepatan angin 12,9 m/det.
ANALISIS TEKANAN STATIK ALIRAN DI PERMUKAAN PITOT STATIK TEROWONGAN ANGIN TRANSONIK LAPAN Ariwibowo, Agus; Fitroh, Ahmad Jamaludin; Herdiana, Dana
Indonesian Journal of Aerospace Vol. 5 No. 2 (2007): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Static pressure stream analysis has been done on the surface of pitot static for LAPAN transonic wind tunnel by means of numeric and analytic methods. Static pressure hole is placed at 25 cm behind static pitot leading edge. Numerical analysis result demonstrates that shock wave begins to rise under free stream with velocity of 0.9 march. Shock wave occurs in an area around static pitot leading edge so the stream velocity around static pressure hole almost equal with free stream velocity. There is shock wave that cause decreasing of stream total pressure. By known the total pressure and streamn velocity around static pressure hole then static pressure can be calculated. Mach number in the test section can be known from pressure ratio. Keywords: Static pitot, Shock wave, Static pressure, Transonic.
RANCANGAN SISTEM ORIENTASI EKOR TURBIN ANGIN 50 KW Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 5 No. 2 (2007): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

A fin orientation system for wind turbine with a maximum capacity of 50 kw has been designed. The fin system is designed with for the yawing motion. The method used is based on the moment equilibrium criteria. Eccentricity distance of 10 cm was selected for the design. The location of the fin control is placed at the connection between the generator and the fin bar. The design procedures a fin bar of 6m, with the fin area of 25 m. The center of the fin force is located at 3 m from the nose. Whereas the fin angle to the center of the turbine axis is 21.9 degrees. Keywords: Wind turbin, fin, oreintation.
Co-Authors Agus Ariwibowo, Agus Hartono, Firman Herdiana, Dana Saeri Sulistyo Atmadi