Firdausy, Choirun Nisaa (2017) Analisis Pengaruh Mekanisme Passive Variable - Pitch pada Turbin Sumbu Vertikal Darrieus Cascade Terhadap Efisiensi Turbin Hidrokinetik Berbasis Computational Fluid Dynamics. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ada banyak cara yang dapat dilakukan untuk meningkatkan performansi turbin hidrokinetik, diantaranya dengan penyusunan blade turbin secara rangkap pada satu lengan, atau biasa disebut dengan cascade dan juga penggunaan mekanisme passive variable – pitch, yaitu mekanisme yang mengatur blade sehingga dapat bergerak dengan sudut tertentu dengan diatur oleh stopper. Pada penelitian sebelumnya telah dilakukan studi eksperimental dan simulasi mengenai pengaruh penggunaan cascade foil terhadap performansi turbin, yang membuktikan bahwa susunan cascade pada turbin dapat meningkatkan performansi turbin. Dalam penelitian ini, dilakukan analisis mengenai pengaruh penggunaan passive variable – pitch pada turbin Darrieus sumbu vertikal yang disusun secara cascade terhadap performansi turbin. Berdasarkan simulasi yang dilakukan dengan metode CFD, didapatkan hasil bahwa semakin besar kecepatan aliran air, akan semakin besar pula nilai gaya dan torsi pada turbin. Namun nilai koefisien performansi (Cp) justru semakin turun seiring dengan peningkatan nilai kecepatan aliran, dimana Cp terbaik didapatkan pada kecepatan aliran 0,8 m/s dengan nilai Cp sebesar39,76%. Selain itu, pada penelitian ini juga dilakukan analisis terhadap pola tekanan dan streamline kecepatan. Dari kontur tekanan dan streamline kecepatan, terlihat bahwa posisi sudut azimuth 900 memiliki tekanan terbesar dan berbanding terbalik dengan kecepatan.
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There are many ways to increasing the performance of hydrokinethics turbine, such as by arrange multiple turbine in one arm, which usually called as cascade configuration and also by using passive variable – pitch mechanism, a mechanism which allow the blade to move in a certain angle cotrolled by the stopper. On the previous research, it already did both experimental and simulational works about the effect of the use of cascade foil to the performance of the turbine, which is proved that the cascade configuration in turbine can increase the performance of the turbine. In this research, the effect of the use of passive variable – pitch in vertical axis Darrieus cascade turbine to the performance of the turbine is being analyzed. Based on the simulation using CFD method, it is found that the greater the velocity of the water, the greater the force and the torque value of the turbine. But the Coefficient of Power (Cp) of the turbine is decreased when the velocity of the water is increased, where the best Cp is obtained when the velocity of the water is 0,8 m/s with the efficieny value is 39,76%. This research also analyze the pressure contour and the streamline of the velocity. From the pressure contour and velocity streamline, it is found that at 900 of azimuth angle it has the the biggest pressure value and equally inversed with the velocity value.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSF 620.106 4 Fir a |
| Uncontrolled Keywords: | turbin hidrokinetik, darrieus, cascade, passive variable – pitch, CFD, torsi, gaya, kontur tekanan, streamline kecepatan, Cp, hydrokinethics turbine, darrieus, cascade, passive variable – pitch, CDF, torque, force, pressure contour, velocity streamline |
| Subjects: | Q Science > Q Science (General) T Technology > T Technology (General) |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | Choirun Nisaa Firdausy |
| Date Deposited: | 17 Oct 2017 03:44 |
| Last Modified: | 06 Mar 2019 04:52 |
| URI: | http://repository.its.ac.id/id/eprint/46439 |
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