STUDI EKSPERIMEN PENGARUH SILINDER SIRKULAR SEBAGAI PENGGANGGU ALIRAN DI DEPAN SISI RETURNING BLADE TERHADAP PERFORMA TURBIN ANGIN SAVONIUS “Studi Kasus (d/D) = 0,4 ; (S/D) = 1,5 ≤ S/D ≤ 2,4 ; (Re) = 3,0x10^4 , 6,0x10^4 dan 9,0 x 10^4”

RIVASCHA, ANDREADI BAYU (2017) STUDI EKSPERIMEN PENGARUH SILINDER SIRKULAR SEBAGAI PENGGANGGU ALIRAN DI DEPAN SISI RETURNING BLADE TERHADAP PERFORMA TURBIN ANGIN SAVONIUS “Studi Kasus (d/D) = 0,4 ; (S/D) = 1,5 ≤ S/D ≤ 2,4 ; (Re) = 3,0x10^4 , 6,0x10^4 dan 9,0 x 10^4”. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Ketersediaan energi fosil menjadi salah satu topik yang sangat sering dibicarakan. Hal ini karena adanya eksploitasi besar-besaran terhadap energi ini. Akibatnya ketersediaannya pun semakin menipis. Menipisnya energi fosil ini mendorong banyak orang di dunia ini berlomba-lomba mencari energi alternatif atau energi terbarukan. Salah satunya adalah energi angin. Turbin angin tipe Savonius adalah salah satu tipe turbin angin tipe drag, dimana turbin ini menghasilkan daya memanfaatkan gaya drag yang dihasilkan dari tiap-tiap sudunya. Semakin besar perbedaan gaya drag yang terjadi antara kedua sudu, torsi yang dihasilkan juga semakin besar, sehingga daya yang dihasilkan juga semakin besar. Pada penelitian ini, untuk meningkatkan performa turbin angin Savonius, akan dipasangkan pengganggu berupa silinder sirkular yang diletakkan di depan returning blade agar selisih gaya drag antara kedua sudu semakin besar. Penelitian dilakukan dengan menggunakan blower berdiameter 480 mm, yang diletakkan di depan benda uji turbin angin Savonius dengan diameter 101,6 mm, tinggi 300 mm, dan overlap 13 mm. Sedangkan untuk pengganggu silinder sirkular memiliki diameter 40,64 mm dan tinggi 500 mm. Dengan variasi bilangan Reynolds 3,0 x 10^4 , 6,0 x 10^4 , dan 9,0 x 10^4, yang dihitung berdasarkan kecepatan free stream U dan panjang karakteristik L = 2D – b. Variasi lainnya yaitu perbandingan d/D sebesar 0,4 dan jarak 1,5 ≤S/D≤2,4. Pengukuran kecepatan blower diatur dengan voltage regulator, kecepatan angin menggunakan anemometer, putaran poros turbin dengan tachometer, torsi dinamis dengan brakedynamometer, dan torsi statis dengan torquemeter . Hasil yang didapatkan adalah penggunaan silinder pengganggu di depan sisi returning blade turbin Savonius efektif meningkatkan performa turbin. Jarak S/D yang paling optimal adalah pada jarak S/D = 2,0. Dimana pada Re = 3,0 x 10^4 putaran dan torsi statis maksimal turbin berpengganggu mencapai 1,76 kali dan 1,41 kali lebih besar dari turbin tanpa pengganggu. Sementara Coefficient of Power maksimal turbin berpengganggu terjadi pada Re = 6,0 x 10^4 yang mencapai 7,42 kali lebih besar dari turbin tanpa pengganggu. ================================================================================================== The availability of fossil energy is one topic often discussed. This is due to the massive exploitation of this energy. As a result, their availability was decreasing. The depletion of fossil energy has prompted many people in this world are looking for alternative energy or renewable energy. One of them is wind energy. Savonius wind turbine is one of drag-type wind turbine, which produce power utilizing drag force from each blade. In this study, to improve the perfomance of Savonius wind turbine, a circular cylinder as a disturbance will be placed in front of returning blade to increase the difference of drag force between the two blades. So that, the torque and power generated will also increase. This research carried out by using blower with diameter 480 mm, which is placed in front of the Savonius wind turbine with a diameter of 101,6 mm, a height of 300 mm, and 13 mm overlap. As for the circular cylinder has a diameter of 40,64 mm and a height of 500 mm. The experiment is conducted with some variations, such as a distance between the center of the diameter circular cylinder and returning blade (S/D) is 1,5 to 2,4 and Reynolds number 3,0x104 , 6,0x104, and 9,0x104. The Reynolds number is calculated based on the free stream velocity U and the characteristic length L = 2D – b. The measurement blower speed set by a voltage regulator, wind speed using anemometer, the turbine shaft speed using tachometer, dynamic torque using brakedynamometer, and static torque using torquemeter. The results obtained are using a cylinder circular as disturbance effectively increase the performance of turbine. The most optimum S/D = 2,0. Where at Re = 3,0 x 104 the maximum spin and static torque value of the Savonius turbine using a cylinder circular as disturbance reached 1,76 and 1,41 times greater than the turbine without disturbance. While the maximum Coefficient of Power turbine using a cylinder circular as a disturbance occurs at Re = 6,0 x 104, which is reached 7,42 times greater than the turbine without disturbance.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Turbin Savonius, Silinder Pengganggu, Coefficient of Power, Bilangan Reynolds, Jarak S/D
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: ANDREADI BAYU RIVASCHA
Date Deposited: 24 Jan 2017 01:33
Last Modified: 05 Mar 2019 08:46
URI: https://repository.its.ac.id/id/eprint/2725

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